Anisman H, Matheson K (2005). Stress, depression, and anhedonia: caveats concerning animal models. Neuroscience and Biobehavioral Reviews 29, 525–546.
APA (2000). Diagnostic and Statistical Manual of Mental Disorders, 4th edn, text revision (DSM-IV-TR). American Psychiatric Association: Washington, DC.
Barr RS, Pizzagalli DA, Culhane MA, Goff DC, Evins AE (2006). A single dose of nicotine enhances reward responsiveness in non-smokers: implications for development of dependence. Biological Psychiatry. Published online: 30 October 2006. doi:10.1016/j.biopsych.2007.09.015.
Beck AT, Steer RA, Brown GK (1996). Beck Depression Inventory Manual, 2nd edn. The Psychological Corporation: San Antonio, TX.
Berenbaum H, Connelly J (1993). The effect of stress on hedonic capacity. Journal of Abnormal Psychology 102, 474–481.
Berenbaum H, Oltmanns TF, Gottesman II (1990). Hedonic capacity in schizophrenics and their twins. Psychological Medicine 20, 367–374.
Berridge KC, Kringelbach ML (2008). Affective neuroscience of pleasure: reward in humans and animals. Psychopharmacology. Published online: 3 March 2008. doi:10.1007/s00213-008-1099-6.
Bogdan R, Perlis RH, Pizzagalli DA (2006). The effects of 5-HTT genotype and stress on hedonic capacity. Psychophysiology 43, S25.
Bogdan R, Pizzagalli DA (2006). Acute stress reduces hedonic capacity: implications for depression. Biological Psychiatry 60, 1147–1154.
Candrian M, Farabaugh A, Pizzagalli DA, Baer L, Fava M (2007). Perceived stress and cognitive vulnerability mediate the effects of personality disorder comorbidity on treatment outcome in major depressive disorder. Journal of Nervous and Mental Disease 195, 729–737.
Cohen S, Kamarck T, Mermelstein R (1983). A global measure of perceived stress. Journal of Health and Social Behavior 24, 385–196.
Dworkin RH, Saczynski K (1984). Individual differences in hedonic capacity. Journal of Personality Assessment 48, 620–626.
Federenko IS, Schlotz W, Kirschbaum C, Bartels M, Hellhammer DH, Wust S (2006). The heritability of perceived stress. Psychological Medicine 36, 375–385.
Hasler G, Drevets WC, Manji HK, Charney DS (2004). Discovering endophenotypes for major depression. Neuropsychopharmacology 29, 1765–1781.
Hay DA, Martin NG, Foley D, Treloar SA, Kirk KM, Heath AC (2001). Phenotypic and genetic analyses of a short measure of psychosis-proneness in a large-scale Australian twin study. Twin Research 4, 30–40.
Heath AC, Cloninger CR, Martin NG (1994). Testing a model for the genetic structure of personality: a comparison of the personality systems of Cloninger and Eysenck. Journal of Personality and Social Psychology 66, 762–775.
Hyman SE (2007). Can neuroscience be integrated into the DSM-V? Nature Reviews Neuroscience 8, 725–732.
Hyman SE, Malenka RC, Nestler EJ (2006). Neural mechanisms of addiction: the role of reward-related learning and memory. Annual Review of Neuroscience 29, 565–598.
Kasch KL, Rottenberg J, Arnow BA, Gotlib IH (2002). Behavioral activation and inhibition systems and the severity and course of depression. Journal of Abnormal Psychology 111, 589–597.
Kasriel J, Eaves L (1976). The zygosity of twins: further evidence on the agreement between diagnosis by blood groups and written questionnaires. Journal of Biological Science 8, 263–266.
Keedwell PA, Andrew C, Williams SC, Brammer MJ, Phillips ML (2005). The neural correlates of anhedonia in major depressive disorder. Biological Psychiatry 58, 843–853.
Keller MC, Coventry WL, Heath AC, Martin NG (2005). Widespread evidence for non-additive genetic variation in Cloninger's and Eysenck's personality dimensions using a twin plus sibling design. Behavior Genetics 35, 707–721.
Kendler KS, Gardner CO, Gatz M, Pedersen NL (2007). The sources of co-morbidity between major depression and generalized anxiety disorder in a Swedish national twin sample. Psychological Medicine 37, 453–462.
Kendler KS, Gatz M, Gardner CO, Pedersen NL (2006). Personality and major depression: a Swedish longitudinal, population-based twin study. Archives of General Psychiatry 63, 1113–1120.
Kendler KS, Ochs AL, Gorman AM, Hewitt JK, Ross DE, Mirsky AF (1991). The structure of schizotypy: a pilot multitrait twin study. Psychiatry Research 36, 19–36.
Kreek MJ, Nielsen DA, Butelman ER, LaForge KS (2005). Genetic influences on impulsivity, risk taking, stress responsivity and vulnerability to drug abuse and addiction. Nature Neuroscience 8, 1450–1457.
Linney YM, Murray RM, Peters ER, MacDonald AM, Rijsdijk F, Sham PC (2003). A quantitative genetic analysis of schizotypal personality traits. Psychological Medicine 33, 803–816.
Loas G (1996). Vulnerability to depression: a model centered on anhedonia. Journal of Affective Disorders 41, 39–53.
MacDonald AW III, Pogue-Geile MF, Debski TT, Manuck S (2001). Genetic and environmental influences on schizotypy: a community-based twin study. Schizophrenia Bulletin 27, 47–58.
Macmillan NA, Creelman CD (2005). Detection Theory: A User's Guide, 2nd edn. Lawrence Erlbaum: Mahwah, NJ.
Matthews SC, Simmons AN, Strigo I, Jang K, Stein MB, Paulus MP (2007). Heritability of anterior cingulate response to conflict: an fMRI study in female twins. NeuroImage 38, 223–227.
Meehl PE (1975). Hedonic capacity: some conjectures. Bulletin of the Menninger Clinic 39, 295–307.
Meyer-Lindenberg A, Weinberger DR (2006). Intermediate phenotypes and genetic mechanisms of psychiatric disorders. Nature Reviews Neuroscience 7, 818–827.
Neale MC, Boker SM, Xie G, Maes HH (1999). Mx: Statistical Modeling. Department of Psychiatry, Box 126 MCV: Richmond, VA 23298.
Noble EP (2003). D2 dopamine receptor gene in psychiatric and neurologic disorders and its phenotypes. American Journal of Medical Genetics. Part B, Neuropsychiatric Genetics 116, 103–125.
Ono Y, Ando J, Onoda N, Yoshimura K, Momose T, Hirano M, Kanba S (2002). Dimensions of temperament as vulnerability factors in depression. Molecular Psychiatry 7, 948–953.
Ooki S, Yamada K, Asaka A, Hayakawa K (1990). Zygosity diagnosis of twins by questionnaire. Acta Geneticae Medicae et Gemellologiae 39, 109–115.
Orstavik RE, Kendler KS, Czajkowski N, Tambs K, Reichborn-Kjennerud T (2007). The relationship between depressive personality disorder and major depressive disorder: a population-based twin study. American Journal of Psychiatry 164, 1866–1872.
Otte C, McCaffery J, Ali S, Whooley MA (2007). Association of a serotonin transporter polymorphism (5-HTTLPR) with depression, perceived stress, and norepinephrine in patients with coronary disease: the Heart and Soul Study. American Journal of Psychiatry, 164, 1379–1384.
Pizzagalli DA, Bogdan R, Ratner KG, Jahn AL (2007). Increased perceived stress is associated with blunted hedonic capacity: potential implications for depression research. Behaviour Research and Therapy 45, 2742–2753.
Pizzagalli DA, Evins AE, Schetter Cowman E, Frank MJ, Pajtas PE, Santesso DL, Culhane M (2008 a). Single dose of a dopamine agonist impairs reinforcement learning in humans: behavioral evidence from a laboratory-based measure of reward responsiveness. Psychopharmacology 196, 221–232.
Pizzagalli DA, Iosifescu D, Hallett LA, Ratner KG, Fava M (2008 b). Reduced hedonic capacity in major depressive disorder: evidence from a probabilistic reward task. Journal of Psychiatric Research. Published online: 21 April 2008. doi:10.1016/j.jpsychires.2008.03.001.
Pizzagalli DA, Jahn AL, O'Shea JP (2005). Toward an objective characterization of an anhedonic phenotype: a signal detection approach. Biological Psychiatry 57, 319–327.
Purcell S (2001). Appendix: statistical methods. In Behavioral Genetics, 4th edn (ed. Plomin R., DeFries J. C., McClearn G. E. and), pp. 327–371. Worth Publishers: New York.
Rijsdijk FV, Sham PC (2002). Analytic approaches to twin data using structural equation models. Briefings in Bioinformatics 3, 119–133.
Tripp G, Alsop B (1999). Sensitivity to reward frequency in boys and with attention deficit hyperactivity disorder. Journal of Clinical Child Psychology 28, 366–375.
Watson D, Weber K, Assenheimer JS, Clark LA, Strauss ME, McCormick RA (1995). Testing a tripartite model: I. Evaluating the convergent and discriminant validity of anxiety and depression symptom scales. Journal of Abnormal Psychology 104, 3–14.