‘Visible’ compulsions: OCD and the politics of science in British clinical psychology, 1948–1975

Abstract This article historicizes a single stage in how the contemporary obsessive–compulsive disorder (OCD) category was built. Starting from the position that the two central components which make up OCD are ‘obsessions’ and ‘compulsions’, it illustrates how these concepts were taken apart by a small group of clinical psychologists working at the Institute of Psychiatry and the Maudsley psychiatric hospital in south London in the early 1970s, and why compulsions were investigated whilst obsessions were ignored. The decision to distinguish the previously undifferentiated symptoms is attributed to the commitment amongst psychologists at the Maudsley, most notably Stanley Rachman, to an empirical conception of science which emphasized observability. Two aspects of this are discussed. First, compulsions were deemed ‘visible’ through their correspondence with animal behaviour. Second, the symptom was seen as open to an experimental modification procedure which privileged visible outcomes. Ultimately, the article concludes that the historical division between ‘obsessions’ and ‘compulsions’, and the extensive investigation of the latter, has had substantial implications for the development of OCD as a category centred on visible behaviours and treated through behavioural means.

Obsessive-compulsive disorder (OCD) is a significant mental health diagnosis in the twenty-first century.The World Health Organisation (WHO) lists OCD as one of the ten most 'disabling' illnesses of any kind in terms of loss of earning and reduced quality of life, and it is frequently cited as the fourth most common 'mental disorder' globally after depression, substance abuse and social phobia. 1 Contemporary definitions of OCD are constituted around two key concepts: obsessions and compulsions.Clinical guidelines in Britain define 'obsessions' as 'unwanted, intrusive thoughts and images that repeatedly enter a person's mind'often violent or sexual in contentand 'compulsions' as 'repetitive behaviours that a person feels driven to perform'such as checking a door is locked or repeated handwashing. 2In order to receive a diagnosis of OCD an individual must present with obsessions and compulsions which are 'excessive, time consuming, distressing, and interfering with their lives'. 3The category of OCD as made of up of these two componentsbehavioural compulsions and mental obsessionsis consistent in diagnostic guidelines across the anglophone world. 4his article will demonstrate the first stage in how the current psychological category of OCD was built, and how its formation was contingent upon what counted as 'valid' scientific evidence amongst clinical psychologists working at the Institute of Psychiatry (IoP) and the Maudsley psychiatric hospital in south London in the early 1970s. 5It will focus specifically on the work of Stanley Rachman, who was a clinical psychologist at the IoP, and who took a particular interest in obsessional phenomena.Starting from the position that the two central components which make up OCD are 'obsessions' (internal thoughts) and 'compulsions' (external behaviours), it will explain how Rachman and his colleagues took these concepts apart and why extensive experimental investigation occurred in order to build a stable concept of 'compulsions' as a form of pathological behaviourpredominately acts of handwashing.The decision to differentiate the previously ambiguous concepts of 'obsessional ruminations' (shortened to obsessions) and 'compulsive rituals' (compulsions) was due to the adherence amongst psychologists at the Maudsley to a positivist strand of experimental science which argued that 'valid' knowledge was that which was observable and visibly modifiable.Obsessional ruminationswhich were deemed to have no visible referentwere considered beyond the realm of verifiable, and thus of 'scientific' ways of knowing.The initial division between obsessions and compulsions has had long-term implications for the development of OCD as a category centred on the presence of observable behaviours and treated through behavioural interventions.
Despite the prevalence of OCD as a significant mental health diagnosis, a comprehensive historical analysis of the category has yet to be undertaken.Scholars who have explored the concept through a historical lens have overwhelmingly projected the present conception of OCD into the past and thus rendered it both stable and timeless.This is particularly evident in German Berrios's 'conceptual' history of obsessive-compulsive disorder, in which the psychiatrist makes statements such as 'after the 1850s, OCD was redefined within a new category, "folie avec conscience" (insanity with insight)'as if these two different concepts represent the same underlying thing (namely, contemporary OCD). 6A similarly retrospective approach is adopted by the disability scholar Lennard Davies in Obsession: A History, where the definition of 'obsession' -'a focused activity, an ideè fixee, or simply a preoccupation'is located in such varied places as contemporary OCD and nineteenth-century 'monomania', and as part of the marketing strategy for the Calvin Klein perfume -'Obsession'. 7Davies's study, foregrounded as a 'biocultural approach' to obsessions, moves from period to period without reflection on the processes of transformation taking place. 8As Chris Millard has usefully stated, 'blanket terms like "social" and "cultural" do not really clarify what is happening when new behaviours come to prominence'. 9In fact, such an analysis gives a transhistorical validity to a single definition of 'obsession' which is located across different historical and cultural spaces.The works of Berrios and Davies are, in an important sense, ahistorical: in interweaving contemporary OCD into the past, the scholars neglect to shed light on whyand in what contextthe modern concepts of 'obsession' and 'compulsion' emerged (and converged), and how they became stable objects of psychological enquiry.Put simply by Adrian Wilson, 'responses to diseases are permitted to vary historically; but this historiographic permission is withheld from diseases themselves'. 10ver the last decade there has been a substantial increase in qualitative approaches to the study of OCD, particularly in the fields of linguistic and cultural studies.11Within this body of work, scholars have identified the important historical shift from the psychoanalytic 'obsessional neuroses' to the psychological category of OCD as it appeared in the third edition of the American Diagnostic and Statistical Manual in 1980.12David Healey, for example, has explained how psychoanalytic interpretations gave way to the modern OCD concept in response to the marketing of Clomipramine in Americaan argument which reflects the analysis that several historians have made to explain the emergence, and growth, of novel psychiatric conditions. 13Healey's notion that OCD emerged from psychopharmaceutical research, however, is misleading.This is especially so in the UK, where the category was constituted through the profession of clinical psychology and the first line-treatment for OCD since 1980 has been psychological rather than drug-oriented.In fact, the marketing of Clomipramine rereferred to by Healey relied on the conception of OCD developed at the Maudsley. 14In response to existing literature, the following work will produce novel insights into the conceptual architecture underpinning contemporary OCD.It will emphasize that the differentiation of, and relationship between, 'obsessions' and 'compulsions' was not the result of a new pharmaceutical intervention, but emerged from the application of a set of distinct experimental practices which formed the basis of a new clinical psychology in Britain.
In centring the conceptual development of OCD in relation to historically situated psychological practice, this article will also build upon two areas in the history of clinical psychology.The first is how a language derived from early twentieth-century behaviourism has been used to underpin a particular model of human 'disorder'and the consequences of this.Kurt Danziger's genealogical approach to the concepts of 'behaviour' and 'learning' are vital in contextualizing the historical links between behavioural ideas and empirical ways of thinking. 15He also draws attention to the way in which behavioural psychologists merged theory and practice, the latter confining the conceptual possibilities of the former.What is absent from his work, and from histories of behaviourism more broadly, is the function of these terms in relation to a specific diagnostic category.
The second area relates to the historiography of clinical psychology in Britain.A number of historians have traced the development of a distinct form of British clinical psychology to the establishment of the Institute of Psychiatry (IoP) as a research and teaching adjunct to the Maudsley hospital in 1948. 16Prior to this period, psychology in Britain had little institutional overlap with psychiatry, and work with adult psychiatric patients was virtually unknown.17However, this all changed when, in a desire to bolster the scientific grounding of his profession, the psychiatrist and head of the new IoP, Aubrey Lewis, invited the psychologist Hans Eysenck to map out a psychology department at the institute and train a new type of specialist: the 'clinical psychologist'. 18Sarah Marks and Maarten Derksen have respectively illustrated how the institutional arrangements and professional rivalries at the IoP enabled psychologists to move from working initially as technical assistants to psychiatrists (with limited access to patients) to practitioners administering behavioural interventions. 19They argue that, under the direction of Eysenck, new Maudsley psychologists drew on the 'laboratory practices' of empiricism to advance behavioural approaches and position themselves as uniquely contributing to the mental health setting.The way in which the principles of this researchexperimental, observable and verifiableconstituted the key components of a novel psychological category, however, has yet to be considered.The present article thus situates the development of OCD as rooted in the specific scientific practices operating within this unique institutional space.
To recap, the following work will trace the first stage in the conceptual formation of OCD in the early 1970s.It will outline how Rachman and his colleagues at the Maudsley demarcated the previously undifferentiated concepts of 'obsessional ruminations' and 'compulsive rituals' and extensively investigated the latter.This built up a model of 'compulsions' as visible pathological behaviours, whilst ruminations were placed outside the realm of empirical psychological enquiry.There were two strands underlying this process: the first was the use of models derived from animal experimentation and rooted in behaviourist psychology, and the second was the application of an 'experimental method'defined through observation and verificationto the clinical setting.These strands, which adhered to a particular conception of psychological 'science', had significant implications for the differentiation between, and constitution of, 'obsessions' and 'compulsions', and their eventual conjoining as OCD.The decision made in the early 1970s to emphasize 'visible' behaviours and exclude ruminations was fundamental in shaping subsequent conceptions of the category.
The following argument relies predominately on a close reading of a series of psychological studies published between 1970 and 1975.These publications have an impressive internal coherence: they outline psychological experiments conducted in a single institution (the department of psychology at the IoP), they are all authored (or co-authored) by Rachman, and they were all published in Behaviour Research and Therapy (BRAT)a journal established in 1963 by Eysenck, and of which Rachman was the long-term editor.In fact, as Roderick Buchanan has argued, the BRAT journal was part of a conscious effort by Eysenck to advance clinical psychology as a unique and viable profession through the extensive publication of behavioural-therapy research. 20The unity of these publications in terms of their authorship, location and continued self-referencing enabled a coherent concept of 'compulsions' to emerge.I am aware of not being able to access the heterogeneous space of the clinic where the experimental studies took place, and in which the nuanced interactions between patients and practitioners will undoubtedly have shaped the psychological knowledge produced.However, analysing published material gives an important sense of how these psychologists wanted their ideas to be presented and the processes of exclusion and emphasis in psychological knowledge formation.The articles used hereand the intellectual decisions they containwere absolutely central to the emergence of OCD as a psychological concept centred on visible behaviours.The fact that these publications continue to be referenced in contemporary clinical literature on OCD is a testament to their centrality in establishing the conceptual components of the category.
From 'neuroses' to 'compulsions' It is not the case that discussions of 'obsessions' and 'compulsions' emerged in the 1970s out of a vacuum.The terms have a complex history and are found, for example, in Sigmund Freud's category of Zwangsneurosewhich was translated in Britain as 'obsessional neurosis' and in America as 'compulsion neurosis'. 21However, the partitioning of 'obsessions' and 'compulsions' as two distinct concepts, differentiated and placed in a binary of visible behaviour and invisible thoughts, was historically new and conceptually different from earlier packaging of these terms.In Freud's writings, Zwang referred to persistent ideas that emerged from intrapsychic conflict: a tension between unresolved childhood wishes (those of love and hate) and the the critical self (ego) were substituted with the pathological symptoms of obsessional thinking. 22Freud's category was adopted and modified in Britain during the interwar years as part of a broader introduction of psychoanalytic concepts in discussions around 'shell shock', and 'obsessional neurosis' became a staplealthough inconsistently defineddiagnosis in British psychiatric textbooks of the period. 23n broader psychiatric discussions of 'obsessional neurosis' in Britain from the 1930s, the terms 'obsession' and 'compulsion' were not clearly demarcated and were frequently used interchangeably, and their application depended on the practitioner in question.The complexity around their meaning is demonstrated in the writings of Maudsley-based psychiatrist, and subsequent head of the IoP, Aubrey Lewis, who in 1935 referred to 'obsessional illnesses' as made up of 'compulsive obsessions', 'obsessional impulses' and 'compulsive inner speech'. 24In the framework outlined by Lewis, 'obsession' referred to persistent and unwanted ideas and/or impulses (urges to act) whilst 'compulsion' denoted the accompanying affect: a subjective 'desire to resist'. 25In discussions amongst clinical psychologists more immediately prior to the 1970s, 'obsession' and 'compulsion' again took a different formdemonstrating how their messy use was not confined to a single approach.In 1969, a behavioural psychologist whose ideas were adopted by psychologists working at the Maudsley referred to 'obsessional neurosis' as made up of three 21 Sigmund Freud, 'Two case histories: Little Hans and The Rat Man' (1909), in The Standard Edition of the Complete Psychological Works of Sigmund Freud, vol. 10 (ed.J. Strachey), London: Hogarth Press, 1955. 22Freud, op.cit.(21), p. 160. 23The changes from Freudian conceptions of obsessional neurosis in British psychiatry rested primarily on a misinterpretation of the term 'instinct'.There was also a centralization of fear/anxiety rather than guilt and selfreproach.See Eva Surawy Stepney, 'From psychoanalysis to psychosurgery: shifting discourses on obsessional thoughts in British psychiatry, c. 1920s-1960s', unpublished master's dissertation, 2019, pp.1-37, 25.
The British Journal for the History of Science 'obsessional behaviours': 'impulses to do things' (such as kill, confess, attack or steal), 'compulsions' (which are the 'cases of those impulses acted upon') and 'elaborate and sometimes incredibly time consuming rituals such as eating, dressing, and sexual performance'. 26Examples of 'compulsions' included exhibitionism, gambling, 'pleasurable' masturbation and the incessant plucking of one's eyebrowssymptoms which differed substantially from those contained in the differentiated concepts of 'obsessional ruminations' and 'compulsive rituals' that emerged throughout the 1970s.The demarcation of 'obsessions' and 'compulsions'and their constitution as two distinct but related conceptstook place under the direction of Stanley (Jack) Rachman, a South African psychologist who joined the IoP in 1959 to conduct research under Eysenck, and became head of the clinical section in 1974. 27In a series of experimental studies published between 1970 and 1975, Rachman and his colleaguesthe clinical psychologist John Marzilier, the psychological researcher Ray Hodgson and the psychiatrist Isaac Marksestablished a clear division between the symptoms of 'obsessional ruminations' and 'compulsive rituals' in psychiatric inpatients diagnosed with the psychoanalytic category 'obsessional neurosis.' 28The division between these components was established, and strengthened, through carrying out a number of consecutive experimental investigations on individuals who exhibited 'overt compulsive rituals' and the active exclusion of patients described as 'obsessional ruminators'. 29In an experimental investigation of ten cases of 'chronic obsessive neurosis' in 1972, for example, Rachman, Hodgson and Marks reported that 'compulsions had to be present for entry into the trial and patients complaining of ruminations were excluded'a statement reiterated in subsequent texts. 30As a consequence of this differentiation and exclusion, a model of 'compulsive rituals' as visible and repetitive behaviours emerged, whilst 'ruminations' were placed firmly outside the realm of psychological enquiry.
In a single-authored publication in 1971, Rachman gives us a sense of the rationale for the demarcation of compulsive rituals and obsessional ruminations, and the exclusion of the latter from his departmental research programme.From a 'reasonable amount of unsystematised information', derived from existing literature and working in the clinical environment, the psychologist defined obsessional ruminations as a 'pathological phenomenon' consisting of 'repetitive and unacceptable thoughts that are distasteful, shameful or abhorrent'. 31In light of this description, he commented that 'obsessional ruminators raise special problems for the behavioural psychologist because of their subjective, private nature'.Rachman went on to explain that repetitive thoughts are 'not visible, are unpredictable, and also provide a stark reminder to the limits one can press animal analogies'. 32The subjective and elusive quality of ruminations was presented in firm contrast with 'the other main feature of obsessional neurosis, compulsive behaviour'. 33Compulsions 'can be approached with greater ease'; they are 'visible', and have a 'predictable quality' and 'many reproducible analogies in animal research'.
It is important to emphasize that the 'visibility' of a concept termed 'compulsive behaviour'and the private nature of ruminationswas not an inevitable distinction, but the result of an understanding of psychological science which emphasized observability.Through their perceived external nature, compulsions were deemed open to both cross-species comparison and experimental modification.The decision to differentiate the previously ambiguously related concepts of 'obsessions' and 'compulsions' and extensively investigate the latter led to an emphasis on behaviours in the formation of OCD, whilst 'subjective' thoughts were subordinated as of secondary importance.

Of the visible and the clinical
The differentiation between obsessions and compulsions on the basis of visibility can only be adequately understood with reference to the broader context of clinical psychology as it evolved at the IoP in the decades following the Second World War.The emergence of clinical psychology as a new profession at the IoP in 1948, and the early battles to secure its status, have been well documented by historians. 34As Buchanan has outlined, in an attempt to carve out the contribution of the new profession to post-war mental health services, Eysenck spent much of the 1950s and 1960s engaging in a public demarcation of clinical psychology from both psychoanalysis and medical psychiatry on the basis of scientific princples. 35In contrast to existing mental health professions, which centred on 'flawed' descriptive case studies, the head of the Maudsley psychology department insisted that his clinical psychologists were 'laboratory scientists' who applied the 'scientific method' directly to the clinical setting. 36Reflecting, but not explicitly referencing, a loose blend of twentieth-century logical empiricism, and the operational methodology of US behaviourists, Eysenck's 'scientific method' centred on visibility: what counted as valid scientific knowledge was that which had an observable referent and could be verified (or falsified) through experimental means. 37In other words, any theoretical terms 'for which there were no corresponding observational consequences were considered meaningless'. 38ysenck's empirical conception of scienceand its application to the clinicmanifested in two ways: psychologists working at the Maudsley adopted a model of fear rooted in animal behaviour, and transformed it into a novel approach to treatment based on repeated, experimental testing.
In his desire to bring 'science' into the clinic, Eysenck advocated for a theory of neurotic anxiety that had its 'origin in laboratory experimentation'. 39Fortunately, such an approach could be found in the learning theory of early to mid-twentieth-century neobehaviourist psychologists, such as Orval Mowrer and Clark Hull, whom Eysenck viewed as 32  sharing his scientific outlook. 40The foundational principle of these researchers was that the behaviour of all organisms was learnt through an interaction with the environment, and that either reward or punishment associated a particular event or object (stimulus) with a corresponding behaviour (response). 41Importantly, Hull and Mowrer conceptualized anxiety in stimulus-response terms, with the added component of motivation.In Principles of Behaviour (1943) Hull wrote that 'anxiety is a learnt response, occurring to "signals" that in the past … have been followed by situations of injury or pain (unconditioned stimuli)'. 42Based on a series of experiments involving administering electric shocks to rats, he proposed that anxiety served a 'useful function of motivating and reinforcing behaviour that tends to avoid or prevent the recurrence of pain'. 43Anxiety was thus a 'motivational and reinforcing agent' which, akin to hunger and sex, acted to associate a stimulus with a particular behavioural response. 44It could be either adaptive and involuntary, such as fear in response to pain, or 'maladaptive' and voluntary, such as ongoing and repeated avoidance.Whilst Hull had predominately worked with rats in laboratory settings, and focused on elucidating the general mechanisms of learning, psychologists at the Maudsley applied this stimulus-response model of anxiety (conditioned fear) to the treatment of psychiatric inpatients.In 1960 Eysenck wrote that all neurotic symptoms (those driven by fear) are 'learned patterns of behaviour which are maladaptive'. 45In light of this, he maintained that the treatment efforts of psychologists should focus 'on the extinction of the unadaptive conditioned responses'i.e. on eradicating 'neurotic' behaviour. 46The learning framework represented a radical departure from early twentieth-century conceptions of neurotic anxiety, which were understood either as an ingrained evolutionary 'instinct' (in psychiatry and early psychology) or as the result of repressed psychic trauma (in psychoanalysis). 47ue to its origin in laboratory experimentation, the stimulus-response model of anxiety was understood as open to 'objective' investigation.It gave rise to a series of cause-and-effect problems which could be studied experimentally 48 for example, which stimulus produced which behavioural response, under which environmental conditions.Such an approach was presented as a contrast to psychoanalysis which, in his sustained public critique, Eysenck maintained was 'outside the realm of science'. 49He wrote that 'what the Freudian model lacks above all, is an objectively testable modus operandi which can be experimentally studied in the laboratory, which can be precisely quantified, and which can then be subjected to the formulation of strict scientific laws'. 50The psychologist went on to profess that psychoanalysis 'had no empirical or rational foundation' because psychoanalysts 'reason theoretically, without demonstrating experimentally, and errors are the result'. 51It was theoretically unreliable because it rested on principles, such as the 'unconscious', which had no visible referent, and it was 'ineffective' because it was not possible to guarantee the connection between cause (therapy) and effect (recovery) in every case. 52In its reliance on descriptive case studies, Eysenck thought, psychiatry also lacked an empirical basis.As one of the first Maudsley psychologists wrote, it is 'easy to accept their [psychiatrists'] theories of abnormal behaviour if they have not been tested, but when these explanations are formulated as a "problem" to the experimenter, one finds many explanations are not explanations at all because nothing [visible] follows from them'. 53Instead, Eysenck and his early allies were concerned that clinical accounts produce a demonstrable account of human disorder.They stressed that clinical psychologists should focus on observable behavioural acts and reject 'mental processes' which could not be subject to external systems of verification.Interventions derived from behavioural learning theory, Eysenck argued, could be testedand refinedin the clinical setting until they reached the threshold of 'scientific' (observable) evidence.
Drawing on Eysenck's vision, throughout the 1950s and 1960s the first Maudsley psychologists developed novel interventions for the 'functional neuroses' through an emphasis on overt behavioural symptoms and their 'modification'. 54Rachman, in particular, keenly shared Eysenck's 'laboratory-to-clinic' vision and has been described as 'Eysenck's right-hand man in the clinica productive researchers and skilled practitioner'. 55Unlike his former supervisor, however, Rachman spent the majority of his time in the clinical setting and was thus able to manifest what Eysenck never did himselfapplying these scientific principles to psychiatric inpatients. 56The 'visible' and 'predictable' quality of compulsive rituals, and the inaccessibility of ruminations, were due to their fit within the two existing frameworks underpinning the ethos of Maudsley clinical psychology since the 1950s: pathological symptoms as learnt 'maladaptive' behaviours and the novel application of behavioural models to the clinical setting (i.e. to patients).Both of these frameworks were rooted in an empirical conception of science which emphasized observability and external verification.The integration of a theory of learning derived from laboratory animals, and a 'scientific' practice which maintained that knowledge is valid if it can be made testable, rendered 'compulsive rituals' visible.Compulsions could be observed in animal behaviour and could be visibly modified in experimental settings.

Animal models: 'anxiety-reducing' behaviours
The entirety of the studies on 'compulsive rituals' conducted by Rachman and his colleagues were underpinned by, and consistently referenced, a selection of experimental analogues of 'stereotyped' and 'fixed' behaviour in animals. 57The use of animal experiments in making 'compulsive behaviour' visible is perhaps unsurprising in the context of 52 Eysenck, op.cit.(40). 53Robert Payne, 'Experimental method in clinical psychological practice', Journal of Mental Science (1957) 103, pp.189-96, 191.Eysenck was not the only one advocating for psychologists to bring science into the clinic.Monte Shapiro, the head of the clinical section, also promoted experimentation as foundational to evidence and joined Eysenck in the assault on medical psychiatry.Shapiro was not a fan of behaviour therapy, believing that it failed to meet standards of evidence.Instead, he favoured the hypothetico-deductive method, which ended up being too time-consuming. 54H. Gwynne-Jones, 'The application of conditioning and learning techniques to the treatment of a psychiatric patient', Journal of Abnormal and Social Psychology (1956) 52(3); Aubrey Yates, 'The application of learning theory to the treatment of tics', Journal of Abnormal Society Psychology (1958) 56(2); Victor Meyer, 'Case report: the treatment of two phobic patients on the basis of learning principles', Journal of Abnormal and Social Psychology (1957) 55(2). 55Buchanan, op.cit.( 16), p. 26. 56Buchanan, op.cit.(16). 57Also Richard Solomon, 'Traumatic avoidance learning: acquisition in normal dogs', Psychological Monographs: General and Applied (1953) 67(4).
The British Journal for the History of Science https://doi.org/10.1017/S0007087423000328Published online by Cambridge University Press behaviourisma tradition which has been shown to have its roots in early twentiethcentury biology and comparative psychology. 58However, the implications of this practice are significant.The translation of models derived from animal behaviour to human 'disorders'and the consequences of their use as 'knowledge production tools'has an extensive critical scholarship. 59In 2018 the historian Nicole Nelson explored the use of laboratory mice in genetics research, arguing that their ability to 'straddle the boundary between the natural and the artificial'they share an 'evolutionary history' with humans, but could be made to do things that would be impossible with human subjectsmade them the 'perfect research tools'. 60he link with the 'natural world' (through evolution)whilst being able to be placed in artificial settingscertainly played a part in the use of animal experiments by behaviourally inclined psychologists.However, Nelson's assertion that genetic researchers are 'committed to complexity' in their awareness of the limits of mice in illustrating 'disorders that are uniquely human' presents an important contrast to the use of animal models in studies of compulsive behaviour. 61Nelson wrote, 'although mice may offer many advantages as research tools, it was recognised [by a group of genetic researchers] that they cannot replicate the many core features of behavioural disorders.Mice cannot lose their jobs or damage their relationships … and they cannot talk about their subjective experience'. 62Nevertheless, for the likes of Rachman and Eysenck, the exclusion of the 'uniquely human' was precisely the point.As Nancy Campbell has argued with regard to the use of primates by researchers formulating ideas about addiction in interwar America, models derived from animals imposed a constraint on the explanations of behaviour in humans: they enabled pathological symptoms to be understood as the result of processes devoid of both subjective and social context. 63This enabled psychologists to establish a break with analytic case studies, whilst displaying an adherence to what was considered 'natural' and 'scientific'.As Eysenck remarked, if the 'laws' of behaviour extended across all organisms, they had a greater degree of 'objectivity'. 64The elimination of human communication had significant implications for the differentiation of 'obsessions' and 'compulsions' on an axis of inaccessible thoughts and visible behaviours.Put simply, constraining the explanation of obsessional phenomena in terms of what was observable in animals meant that thoughts could not be accounted for.
In their first publication on the treatment of a case of 'obsessional neurosis' in 1970, Rachman, Hodgson and Marzilier referred to an experiment conducted in 1949 'which had proved successful in overcoming compulsive behaviours in animals'. 65They were referring to a study conducted by the American psychologist Norman Maier.In his laboratory at the University of Michigan in the 1940s, Maier researched the 'learning patterns' of rats by constructing an apparatus in which they had the option of jumping towards one of two windows: one window had a reward (food) and the other had a punishment (a bump on the nose). 66Maier demonstrated that when he randomized which window led to reward and which led to punishment, the rats were placed in an 'insoluble situation' and began engaging in 'stereotyped' and 'rigid' jumping behaviour which became 'fixated'. 67To overcome this repetitive jumping, the psychologist cornered the rats and used his hand to 'guide' them through the windows, this time neither resulting in a bump on the nose.After repeating the 'guidance' for a few days, Maier reported that the rats ceased in their 'fixated' and 'rigid' jumping and began to move through the windows with ease.Commenting on this experiment in 1965, Rachman and Eysenck stated that when an animal is placed in a 'problem situation … it adopts a behavioural response which reduces anxiety', and this anxiety reduction subsequently becomes 'self-reinforcing'. 68The psychologists remarked that the 'fixated' jumping of Maier's rats had the 'senseless quality typical of compulsive behaviour' and that, like the rats, compulsive behaviour was performed to reduce anxiety. 69It was through this process, they suggested, that it became repetitive.
The jump from 'fixated' behaviour in laboratory rats to repetitive 'rituals' in psychiatric patients had first been made by the Maudsley-trained psychologist Victor Meyer, who expanded the model of 'anxiety-reducing' behaviours to the treatment of two 'obsessional patients' in 1966. 70Drawing on the animal literature, as well as his prior research on phobias, Meyer hypothesized that if 'obsessional rituals' did become 'fixated' due to their capacity to reduce anxiety, then the connection between fear (stimulus) and behaviour (response) could be disrupted through preventing the 'ritual act'.The hypothesis was tested on two psychiatric patients who had been diagnosed with 'obsessional neurosis'.The first had a 'fear of dirt' and 'would only touch foreign objects with tissue paper'. 71The second experienced 'compulsive thoughts of a blasphemous and sexual nature' which were followed by 'avoiding any activity with sexual meaning, e.g., opening drawers, cleaning a pipe, eating oblong objects'. 72The 'experimental' treatment involved Meyer presenting these individuals with what they feared and preventing them from enacting their usual behavioural response.For example, the woman with 'compulsive thoughts' was told to 'imagine having sexual intercourse with the Holy Ghost' whilst Meyer stopped her from performing what he saw as her ritual activities. 73Through enacting these procedures, Meyer reported that having 'obsessionals' regularly confront their fears, and preventing them from enacting 'anxiety-reducing' behaviours, did in fact lead to a reduction in their pathological symptoms.It is important to note that Meyer did not differentiate between 'obsessional symptoms' as 'obsessions' and 'compulsions'.Rather he referred to the 'compelling' quality of thoughts and rituals.
The importance of Meyer's work cannot be overstated.His principle that exposing individuals to fearful 'stimuli' and then preventing their behavioural response ('ritual') led to a reduction of 'obsessional symptoms' provided the therapeutic framework underpinning the experiments conducted by Rachman and his colleagues in the 1970s, and remains the basis of the treatment model used in OCD today.In 2009 Rachman reflected, What he did was very brave.Meyer applied to humans what studies had shown to work on frightened animals: if they were exposed to what scared them for a long period of time, and prevented from leaving the situation, they became less scared.Therapists were afraid to do this with patients … he had broken the ice. 74spite this retrospective admiration, Rachman and his colleagues made a significant modification to Meyer's framework.Central to the conception of 'rituals' outlined by Meyer was the idea that these behaviours were not 'senseless' and 'automatic' (as the study of rats had suggested) but were driven by a 'fear that if these acts are not performed [the patient's] family will eventually be afflicted by some disaster'. 75This notion shaped his selection of patients, who both 'believed that non-performance of rituals would lead to "disastrous consequences"' and provided the rationale behind treatment: 'if the obsessional is forced to remain in a feared situation and prevented from carrying out his rituals, he may discover that the feared consequence no longer takes place'. 76In fact, Meyer wrote that it was these 'future expectations' that distinguished 'obsessional rituals' from phobic behaviours (such as avoidance), and this was why prior behavioural procedures, which had all been designed to treat phobias, had failed to work with obsessionals.The fact that Meyer titled his paper the 'modification of expectations' points to the centrality of future events in his model; it was the 'expectations' under modification.Significantly, Rachman and his colleagues took the exposure and ritual-prevention part of Meyer's work but made a choice to exclude the aspect relating to future 'anticipation'/expectation.This, they argued, was 'not a sufficient condition' for 'successful' symptom modification. 77nstead, in their experiments in the early 1970s, Rachman focused entirely on the performance of repetitive acts in the present, obscuring any discussion of anticipatory events.He had also described the 'fixated' jumping of rats as having the 'senseless quality typical of compulsive behaviour'. 78The use of the term 'senseless' in describing the behaviour of both rats and obsessionals points to an understanding of pathology tied up with irrationality as well as the lack of meaning necessary in a purely functional account.It established a firm contrast with psychoanalytic reasoning in which the 'seemingly senseless' acts of obsessional neurotics contained displaced meaningand therapy constituted a process of sense making (finding the original cause). 79For Rachman, asking individuals about their beliefs with regard to future events risked entering into the realm of unverifiable speculation, which he was intent on avoiding.In the studies conducted throughout the early 1970s, there was no discussion of why 'compulsive rituals' were performed or whether they held meaning for the individual at hand, thus excluding the more complex and less immediately visible factors.
In taking the model of rats as an explanation of obsessional behaviour, Rachman engaged in what Kurt Danzinger has described as 'naïve verbal realism': if one talked about the 'fixation' of a rat when jumping towards a window in relation to the 'fixation' of a human engaged in 'ritual behaviour', one had already established these were the same things and could therefore be explained through the same mechanism. 80The hypothetical model of 'compulsions' established through the animal literature consisted of two parts: a fear producing stimuli, referred to as a 'danger signal', and an action serving to 'reduce that fear'. 81The initial 'danger signal' (the equivalent of a bump on the nose) was conceptualized as a 'maladaptive autonomic response' whilst the 'motor avoidance response' was the visible behaviour. 82With regard to one of their cases, for example, Rachman, Hodgson and Marzilier referred to the individual's 'excessive washing rituals' as the 'behavioural pattern' indicating a 'fear of contamination'. 83It is significant that this 'fear' of contamination was not described as a thought or rumination, but as the 'stimuli' producing an observable response.As Danzinger notes, 'behaviour' never just referred to movement (the beating of the heart was not a 'behaviour'), but had an entire conceptual underpinning which pointed to inferences about the mind, without explicitly mentioning it. 84The use of the category of 'behaviour' allowed psychologists to 'use this language whilst paying their respects to an ideal of scientific objectivity': they could claim to be studying psychological processes in so far as they manifested themselves in visible action. 85venting a 'practical science' In line with the previous work that had been conducted by clinical psychologists at the Maudsley throughout the 1950s and 1960son bed wetting, tics and phobic 'avoidance'the concept of 'compulsive rituals' was constituted through the application of a series of experimental interventions aimed at the visible 'modification' of behaviour. 86This was part of a treatment model which defined successful recovery when a reduction in 'pathological' acts, such as the washing of one's hands, could be accounted for through comparison with pre-treatment frequency.The criterion of behavioural modification was central to the exclusion of ruminations from these early studies.In 1970, Rachman wrote that 'during the course of a research programme which is directed at the modification of obsessional neurosis … it was considered best to concentrate on overt, compulsive behaviour'. 87This statementparticularly the words 'considered best'suggests that the ritual/rumination division was a practical decision made within the confines of a research agenda: to 'modify', and thus be shown to treat, obsessional neurosis.During this period clinical psychologists were seeking to equate 'effective' therapeutics with an observable change in symptoms, and in this context 'obsessional patients who suffered from ruminations but displayed little or no compulsive behaviour were not included in the formal systematic studies'. 88It also adds further explanation as to why the notion of 'future expectations' was not seen as 'a sufficient condition for symptom modification'; such expectations lay outside the remit of observable behavioural change.
The experiments of the early 1970s were framed around testing the hypothesis, derived from animal analogies and Meyer's experimental treatment, that 'compulsions' were anxiety-reducing behaviours which could be 'made extinct through exposing individuals to what they feared and preventing them from carrying out their pathological behavioural response'. 89It is important to emphasize that the line between 'experiment' and 'therapy' is never clearly drawn in these texts.This is evident in the ease with which the psychologists move between referring to themselves as 'experimenter' and 'therapist', and their practice as both 'experimental' and 'therapeutic' modification.The 'subjects' chosen for the studies were also those that fit the demands of the experimental situation.Not https://doi.org/10.1017/S0007087423000328Published online by Cambridge University Press only did this criterion exclude patients with ruminations, but the initial experiments on 'compulsions' were carried out exclusively on psychiatric inpatients with clear washing rituals.The sole inclusion of 'washers' was not justified by Rachman et al. on conceptual grounds, but for pragmatic reasons.He wrote that the 'necessity to provoke the urge to carry out compulsive rituals in an experimental setting proved easy to accomplish in patients with cleaning rituals based on fears of contamination'. 90In response to this pragmatic rationaleand their 'easy' fit into the model of stimulus (fear)-response (visible behaviour)the appendix of participants included in the 1970, 1971 and 1972 studies consisted entirely of 'psychiatric inpatients' with 'clear washing behaviours' linked with a 'fear of contamination' relating to external objects and materials.
The first case to participate in an experiment run by Rachman was an individual who spent four and a half hours a day washing.He undressed 'before urinating or defecating' and described his routine as follows: in the toilet I wash my hands once under the tap with soap then wash the sink then fill it up with hot water.I then wash my hands and arms, rinse them, then wash my face.Then I wash my hands again, dry my hands and face, undo the toilet door with a paper towel then pull up my trouser zip then wash my hands and arms again. 91e 'experimental modification' of this person's behaviour took place through getting him to engage in exposure and ritual prevention.He was required to touch a 'hierarchy' of objects he considered contaminated: a small dish of marmalade, a jar of cigarette ash, a tin of mud, a small bottle of urine and a smear of dog excrement. 92The touching was 'demonstrated to the patient by a calm and reassuring therapist' before he 'shadowed his therapist's actions'. 93The 'obsessional' touched the items from the bottom of the hierarchy first, starting with the mud and eventually placing his hands in the excrement.After each touching, he was prevented from washing his hands for increased periods of time (from thirty minutes to three hours).A subsequent case involved a person with a 'fear of contamination from animals' who also engaged in 'excessive washing rituals'. 94he first session consisted of exposing her to items from the top of her 'fear hierarchy': 'a hamster was set free to run around her bed, towels, clothes and personal belongings.It was placed in her handbag and also her hair'. 95She too was prevented from washing for increased lengths of time.The intention with both of these cases was to disrupt the pathological 'reinforcement connection' between stimulus (contaminated object/material) and response (washing)thus making the repetitive behaviour 'extinct'.
Demonstrating the clinical/experimental 'effectiveness' of these experiments involved a variety of measurements, which ranged from a visible reduction of compulsive acts through to determining a decreased level of avoidance and fear in relation to a 'contaminated' object.The first experimental subject, for example, was discharged when his 'compulsive handwashing' had been 'almost totally eliminated' and was not considered by Rachman 'unduly excessive'. 96With regard to the woman discussed above, the 90 Stanley Rachman and Gisela Roper, 'Obsessional-compulsive checking: experimental replication and development', Behaviour Research and Therapy, 1975, pp.271-7, 271, added emphasis. 91Rachman, Hodgson and Marzilier, op.cit.(28), p. 388. 92Rachman, Hodgson and Marzilier, op.cit.(28). 93Rachman, Hodgson and Marzilier, op.cit.(28). 94Rachman, Hodgson and Marks, op.cit.(28), p. 239.The fact that they were 'excessive' also made it easier to account for behavioural change.In the 1971 study 'two patients were excluded because the disorder was only mild'. 95Rachman, Hodgson and Marks, op.cit.(28). 96Rachman, Hodgson and Marzilier, op.cit.(28), p. 390.
'effectiveness' of each intervention was identified using three metrics: an avoidance test, which measured the proximity in which she could place herself in relation to a contaminated object, a 'fear thermometer' where she rated from one (calm) to ten (terrified) how she felt about touching actions, and a pulsometer to record her pulse rate. 97These scales were taken before and after the behavioural intervention in order to ascertain rates of change.It is significant that the 'fear thermometer' involved measuring a qualitative, rather than behavioural, responsesomething the psychologists do not acknowledge.
What was important was that the participant's 'fear' was made visible though a concrete rating scale that approximated the visibility of behaviour.Rhodri Hayward's discussion of social psychologists at the Maudsley using rating scales to 'make visible' the dynamics of stress in this period, as well as psychometric testing of intelligence in the early twentieth century, illustrates this as a wider trend in psychological research. 98Such testing devices acted to define psychological methods in 'scientific' terms through the depiction of visible change.Rather than any discussion of why rituals were performed or the meaning they held for people, Rachman et al. transformed expressions of fear into empirical data.Such an approach to measuring therapeutic change related to the broader way in which Maudsley clinical psychologists thought about treatment 'efficacy' in this period.In 1952 Eysenck had published a controversial paper which became something of a benchmark for subsequent psychological research. 99Through a broad comparison between American insurance industry data and state hospital records, the psychologist proposed that the rates of recovery achieved through 'psychotherapy' (undefined) were no better than rates of spontaneous remission amongst people suffering from a broad spectrum of neuroses. 100Nick Haslam and Roderick Buchanan argue that Eysenck 'loaded the dice against psychotherapy' by equating remission with discharge or discontinuation of care, and classifying dropouts and 'slightly improved' ratings as therapeutic failures. 101Whilst Eysenck's figure of spontaneous recovery (66 per cent) was 'probably too high', since insurance industries had an interest in divesting themselves of patients, the publication was 'successful in changing the basis of psychotherapeutic evidence from insight to outcome'. 102Rachman retrospectively commented that Eysenck's 1952 paper 'provoked a storm' and 'hailed the beginnings of a new evaluative tradition'. 103In the decades that followed, clinical psychologists at the Maudsley and elsewhere sought to illustrate that their interventions produced rates of 'cure' which convincingly exceeded the 66 per cent threshold.The focus on behaviour, as well as the numerous devices to quantify and externalize outcomes, was part of this desire to produce an intervention for compulsions that signified a substantial rate of visible therapeutic change.Such a move excluded traditional analytic approaches, where any attempts to study outcomes were seen as unable to capture, and might even compromise, the therapeutic process. 104resenting an intervention which could be shown to reduce the observable symptoms (compulsions) associated with 'obsessional illnesses' was considered 'effective' in response to a previously untreatable, and therefore costly, form of mental distress.Long-term psychiatric patientswith visible compulsionscould once again be released into the workforce.

Conclusions
To conclude, this article has outlined the first stage in how the contemporary psychological category of obsessive-compulsive disorder (OCD) was built.It has illustrated how, in the early 1970s, a group of clinical psychologists at the Institute of Psychiatry and the Maudsley hospital, headed by Stanley Rachman, distinguished between the previously undifferentiated concepts of 'obsessional ruminations' and 'compulsive rituals', and conducted extensive experimental investigations on the latter.This built up a model of 'compulsions' as anxiety-reducing behaviours, which could be treated through a novel behavioural treatment.Crucially, I have charted how the decision to divide 'obsessions' and 'compulsions' was based on an adherence amongst clinical psychologists at the Maudsley to an empirical conception of science which emphasized observability.Compulsive rituals were identified as 'visible' through their representation in animal analogies and through their amenability to an experimental form of treatment which prioritized marked behavioural change.Within the scientific frameworks of these new clinical psychologists, who were seeking to demarcate their profession from psychoanalysis and medical psychiatry, ruminative thoughts were rendered inaccessible and unamenable to inquiry.
Both the decision to differentiate between 'obsessions' and 'compulsions' in this period, and the exclusive focus on observable behaviours, echo through the development of OCD right up to the present day.In fact, OCD as a category made up of visible behavioural compulsions and internal mental obsessions never escapes from this historical decision and reductionism.Immediately following the studies in the early 1970s, Rachman and his colleagues replicated the experiments on washing behaviours with regard to acts of 'checking' (e.g.whether the door is unlocked).Despite the differences between these symptoms, the psychologists managed to squeeze 'washing' and 'checking' into a single model of 'compulsions' as two variations of the same behaviour.When there was a return to 'obsessional ruminations' in the late 1970s, the symptom was understood through the lens of external visible behaviours.Terms such as 'mental rituals' were used and the intervention of 'mental exposure' was put forward as an evidence-led treatment. 113Whilst aspects of obsessions were modified somewhat with the advent of cognitive models in the late 1980s, the principle behavioural components have remained foundational to the psychological category.There is a continued emphasis on visible symptoms in diagnostic registers and cultural presentations of OCD, and the 'gold standard' treatment for the disorder in the UK continues to be the behavioural technique of exposure and response prevention (ERP).