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Darwin's mistake: Explaining the discontinuity between human and nonhuman minds

  • Derek C. Penn (a1), Keith J. Holyoak (a2) and Daniel J. Povinelli (a3)

Over the last quarter century, the dominant tendency in comparative cognitive psychology has been to emphasize the similarities between human and nonhuman minds and to downplay the differences as “one of degree and not of kind” (Darwin 1871). In the present target article, we argue that Darwin was mistaken: the profound biological continuity between human and nonhuman animals masks an equally profound discontinuity between human and nonhuman minds. To wit, there is a significant discontinuity in the degree to which human and nonhuman animals are able to approximate the higher-order, systematic, relational capabilities of a physical symbol system (PSS) (Newell 1980). We show that this symbolic-relational discontinuity pervades nearly every domain of cognition and runs much deeper than even the spectacular scaffolding provided by language or culture alone can explain. We propose a representational-level specification as to where human and nonhuman animals' abilities to approximate a PSS are similar and where they differ. We conclude by suggesting that recent symbolic-connectionist models of cognition shed new light on the mechanisms that underlie the gap between human and nonhuman minds.

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G. Andrews & G. S. Halford (2002) A cognitive complexity metric applied to cognitive development. Cognitive Psychology 45(2):153219.

M. Aydede (1997) Language of thought: The connectionist contribution. Minds and Machines 7:57101.

J. V. Baldo , N. F. Dronkers , D. Wilkins , C. Ludy , P. Raskin & J. Kim (2005) Is problem solving dependent on language? Brain and Language 92(3):240–50.

H. C. Barrett (2005) Enzymatic computation and cognitive modularity. Mind and Language 20(3):259–87.

H. C. Barrett & R. Kurzban (2006) Modularity in cognition: Framing the debate. Psychological Review 113:628–47.

L. W. Barsalou (1999) Perceptual symbol systems. Behavioral and Brain Sciences 22(4):577660.

T. J. Bergman , J. C. Beehner , D. L. Cheney & R. M. Seyfarth (2003) Hierarchical classification by rank and kinship in baboons. Science 302(5648):1234–36.

J. L. Bermúdez (2003) Thinking without words Oxford University Press.

J. Blackmon , D. Byrd , D. D. Cummins , P. Poirier & M. Roth (2004) Atomistic learning in non-modular systems. Philosophical Psychology 18(3):313–25.

A. P. Blaisdell & R. G. Cook (2005) Two-item same-different concept learning in pigeons. Learning and Behavior 33(1):6777.

A. P. Blaisdell , K. Sawa , K. J. Leising & M. R. Waldmann (2006) Causal reasoning in rats. Science 311(5763):1020–22.

P. Bloom (1994) Generativity within language and other cognitive domains. Cognition 51:177–89.

P. Bloom (2000) Language and thought: Does grammar makes us smart? Current Biology 10(14):R516–17.

P. Bloom & F. C. Keil (2001) Thinking through language. Mind and Language 16(4):351–67.

P. Bloom & K. Wynn (1997) Linguistic cues in the acquisition of number words. Journal of Child Language 24:511–33.

A. B. Bond , A. C. Kamil & R. P. Balda (2003) Social complexity and transitive inference in corvids. Animal Behaviour 65(3):479–87.

D. Bovet & J. Vauclair (2001) Judgement of conceptual identity in monkeys. Psychonomic Bulletin and Review 8:470–75.

R. A. Brooks (1991) Intelligence without representation. Artificial Intelligence 47:139–59.

P. E. Bryant & T. Trabasso (1971) Transitive inferences and memory in young children. Nature 232:456–58.

T. Bugnyar & B. Heinrich (2005) Ravens, Corvus corax, differentiate between knowledgeable and ignorant competitors. Proceedings of the Royal Society, London B: Biological Sciences 272(1573):1641–46.

T. Bugnyar & B. Heinrich (2006) Pilfering ravens, Corvus corax, adjust their behaviour to social context and identity of competitors. Animal Cognition 9(4):369–76.

J. Call (2004) Inferences about the location of food in the great apes (Pan paniscus, Pan troglodytes, Gorilla gorilla, and Pongo pygmaeus). Journal of Comparative Psychology 118(2):232–41.

J. Call (2006) Descartes' two errors: Reason and reflection in the great apes. In: Rational animals?, ed. S. Hurley & M. Nudds . Oxford University Press.

L. Castro , M. E. Young & E. A. Wasserman (2007) Effects of number of items and visual display variability on same-different discrimination behavior. Memory and Cognition 34:16891703.

D. J. Chalmers (1990) Syntactic transformation on distributed representations. Connection Science 2 (1&2):5362.

M. H. Christiansen & S. Kirby (2003) Language evolution: Consensus and controversies. Trends in Cognitive Sciences 7(7):300307.

A. Clark (2001) Reasons, robots and the extended mind. Mind and Language 16(2):121–45.

A. Clark (2006) Language, embodiment, and the cognitive niche. Trends in Cognitive Sciences 10(8):370–74.

N. S. Clayton , T. J. Bussey & A. Dickinson (2003) Can animals recall the past and plan for the future? Nature Reviews Neuroscience 4(8):685–91.

J. M. Dally , N. J. Emery & N. S. Clayton (2006) Food-caching western scrub-jays keep track of who was watching when. Science 312(5780):1662–65.

C. Darwin (1871) The descent of man, and selection in relation to sex. John Murray.

J. S. DeLoache (2004) Becoming symbol-minded. Trends in Cognitive Sciences 8(2):6670.

F. B. M. de Waal & P. L. Tyack (2003) Animal social complexity: Intelligence, culture and individualized societies Harvard University Press.

C. Eliasmith & P. Thagard (2001) Integrating structure and meaning: A distributed model of analogical mapping. Cognitive Science 25:245–86.

N. J. Emery & N. S. Clayton (2001) Effects of experience and social context on prospective caching strategies by scrub-jays. Nature 414:443–46.

N. J. Emery & N. S. Clayton (2004b) The mentality of crows: Convergent evolution of intelligence in corvids and apes. Science 306(5703):1903–907.

J. I. Flombaum & L. R. Santos (2005) Rhesus monkeys attribute perceptions to others. Current Biology 15(5):447–52.

J. A. Fodor & B. McLaughlin (1990) Connectionism and systematicity. Cognition 35:183204.

J. A. Fodor & Z. Pylyshyn (1988) Connectionism and cognitive architecture: A critical analysis. Cognition 28:371.

D. M. Fragaszy & S. E. Cummins-Sebree (2005) Relational spatial reasoning by a nonhuman: The example of capuchin monkeys. Behavioral and Cognitive Neuroscience Reviews 4(4):282306.

D. M. Fragaszy , A. T. Galloway , J. Johnson-Pynn & K. Brakke (2002) The sources of skill in seriating cups in children, monkeys and apes. Developmental Science 5(1):118–31.

P. Fries , D. Nikolic & W. Singer (2007) The gamma cycle. Trends in Neuroscience 30(7):309–16.

J. L. Garfield , C. C. Peterson & T. Perry (2001) Social cognition, language acquisition and the development of the theory of mind. Mind and Language 16(5):494541.

M. Gattis (2005) Inferencing from spatial information. Spatial Cognition and Computation 5:119–37.

D. Gentner (1983) Structure-mapping: A theoretical framework for analogy. Cognitive Science 7:155–70.

D. Gentner & A. B. Markman (1997) Structure mapping in analogy and similarity. American Psychologist 52:4556.

M. L. Gick & K. J. Holyoak (1980) Analogical problem solving. Cognitive Psychology 12:306–55.

M. L. Gick & K. J. Holyoak (1983) Schema induction and analogical transfer. Cognitive Psychology 15:138.

Y. Goldvarg & P. Johnson-Laird (2001) Naive causality: A mental model theory of causal meaning and reasoning. Cognitive Science 25:565610.

R. L. Gomez (1997) Transfer and complexity in artificial grammar learning. Cognitive Psychology 33(2):154207.

R. L. Gomez & L. Gerken (2000) Infant artificial language learning and language acquisition. Trends in Cognitive Sciences 4(5):178–86.

G. P. Goodwin & P. Johnson-Laird (2005) Reasoning about relations. Psychological Review 112(2):468–93.

A. Gopnik , C. Glymour , D. Sobel , L. Schulz , T. Kushnir & D. Danks (2004) A theory of causal learning in children: Causal maps and Bayes nets. Psychological Review 111(1):131.

U. Goswami & A. L. Brown (1989) Melting chocolate and melting snowmen: Analogical reasoning and causal relations. Cognition 35(1):6995.

U. Goswami & A. L. Brown (1990) Higher-order structure and relational reasoning: Contrasting analogical and thematic relations. Cognition 36(3):207–26.

C. Gregory , S. Lough , V. Stone , S. Erzinclioglu , L. Martin , S. Baron-Cohen & J. R. Hodges (2002) Theory of mind in patients with frontal variant frontotemporal dementia and Alzheimer's disease: Theoretical and practical implications. Brain 125 (Pt 4):752–64.

L. Grosenick , T. S. Clement & R. D. Fernald (2007) Fish can infer social rank by observation alone. Nature 445(7126):429–32.

R. F. Hadley (1994) Systematicity in connectionist language learning. Mind and Language 9:247–72.

R. F. Hadley (1997) Cognition, systematicity and nomic necessity. Mind and Language 12(2):137–53.

Y. Hagmayer , S. A. Sloman , D. A. Lagnado & M. R. Waldmann (2007) Causal reasoning through intervention. In: Causal learning: Psychology, philosophy and computation, ed. A. Gopnik & L. Schulz . Oxford University Press.

G. S. Halford (1984) Can young children integrate premises in transitivity and serial order tasks? Cognitive Psychology 16:6593.

G. S. Halford , W. H. Wilson & S. Phillips (1998a) Processing capacity defined by relational complexity: Implications for comparative, developmental, and cognitive psychology. Behavioral and Brain Sciences 21(6):803–31; discussion 831–64.

B. Hare , J. Call , B. Agnetta & M. Tomasello (2000) Chimpanzees know what conspecifics do and do not see. Animal Behaviour 59(4):771–85.

B. Hare , J. Call & M. Tomasello (2001) Do chimpanzees know what conspecifics know? Animal Behaviour 61(1):771–85.

M. D. Hauser , N. Chomsky & W. T. Fitch (2002a) The faculty of language: What is it, who has it and how did it evolve? Science 298(5598):1569–79.

M. D. Hauser , D. Weiss & G. Marcus (2002b) Rule learning by cotton-top tamarins. Cognition 86(1):B1522.

L. M. Herman , D. G. Richards & J. P. Wolz (1984) Comprehension of sentences by bottlenosed dolphins. Cognition 16:129219.

C. M. Heyes (1998) Theory of mind in nonhuman primates. Behavioral and Brain Sciences 21(1):101–14; discussion 115–48.

M. E. Hogue , J. P. Beaugrand & P. C. Lague (1996) Coherent use of information by hens observing their former dominant defeating or being defeated by a stranger. Behavioral Processes 38:241–52.

K. J. Holyoak , E. N. Junn & D. Billman (1984) Development of analogical problem-solving skill. Child Development 55:2042–55.

K. J. Holyoak & P. Thagard (1997) The analogical mind. American Psychologist 52(1):3544.

J. E. Hummel & K. J. Holyoak (1997) Distributed representations of structure: A theory of analogical access and mapping. Psychological Review 104:427–66.

J. E. Hummel & K. J. Holyoak (2003) A symbolic-connectionist theory of relational inference and generalization. Psychological Review 110:220–64.

J. E. Hummel & K. J. Holyoak (2005) Relational reasoning in a neurally plausible cognitive architecture. Current Directions in Psychological Science 14(3):153–57.

R. Jackendoff (2002) Foundations of language: Brain, meaning, grammar, evolution Oxford University Press.

W. James (1890/1950) The principles of psychology, vol.1. Dover Publications.

S. H. Johnson-Frey (2004) The neural bases of complex tool use in humans. Trends in Cognitive Sciences 8(2):7178.

J. Johnson-Pynn & D. M. Fragaszy (2001) Do apes and monkeys rely upon conceptual reversibility? Animal Cognition 4 (3–4):315–24.

J. Johnson-Pynn , D. M. Fragaszy , E. M. Hirsh , K. E. Brakke & P. M. Greenfield (1999) Strategies used to combine seriated cups by chimpanzees (Pan troglodytes), bonobos (Pan paniscus), and capuchins (Cebus apella). Journal of Comparative Psychology 113(2):137–48.

A. Kacelnik (2006) Meanings of rationality. In: Rational animals? ed. S. Hurley & M. Nudds . Oxford University Press.

E. Kako (1999) Elements of syntax in the systems of three language-trained animals. Animal Learning and Behavior 27:114.

A. C. Kamil (2004) Sociality and the evolution of intelligence. Trends in Cognitive Sciences 8(5):195–97.

J. K. Kroger , K. J. Holyoak & J. E. Hummel (2004) Varieties of sameness: The impact of relational complexity on perceptual comparisons. Cognitive Science 28(3):335–58.

V. A. Kuhlmeier & S. T. Boysen (2001) The effect of response contingencies on scale model task performance by chimpanzees (Pan troglodytes). Journal of Comparative Psychology 115(3):300306.

V. A. Kuhlmeier & S. T. Boysen (2002) Chimpanzees (Pan troglodytes) recognize spatial and object correspondences between a scale model and its referent. Psychological Science 13(1):6063.

V. A. Kuhlmeier , S. T. Boysen & K. L. Mukobi (1999) Scale-model comprehension by chimpanzees (Pan troglodytes). Journal of Comparative Psychology 113(4):396402.

O. F. Lazareva , A. A. Smirnova , M. S. Bagozkaja , Z. A. Zorina , V. V. Rayevsky & E. A. Wasserman (2004) Transitive responding in hooded crows requires linearly ordered stimuli. Journal of Experimental Analysis of Behavior 82(1):119.

O. F. Lazareva & E. A. Wasserman (2006) Effect of stimulus orderability and reinforcement history on transitive responding in pigeons. Behavioral Processes 72(2):161–72.

Y. Lien & P. W. Cheng (2000) Distinguishing genuine from spurious causes: A coherence hypothesis. Cognitive Psychology 40(2):87137.

L. Limongelli , S. T. Boysen & E. Visalberghi (1995) Comprehension of cause-effect relations in a tool-using task by chimpanzees (Pan troglodytes). Journal of Comparative Psychology 109:1896.

J. Loewenstein & D. Gentner (2005) Relational language and the development of relational mapping. Cognitive Psychology 50(4):315–53.

H. Lu , R. G. Morrison , J. E. Hummel & K. J. Holyoak (2006) Role of gamma-band synchronization in priming of form discrimination for multiobject displays. Journal of Experimental Psychology; Human Perception and Performance 32(3):610–17.

G. F. Marcus , S. Vijayan , S. Bandi Rao & P. M. Vishton (1999) Rule learning by seven-month-old infants. Science 283(5398):7780.

A. B. Markman & E. Dietrich (2000) In defense of representation. Cognitive Psychology 40:138–71.

A. B. Markman & D. Gentner (1993) Structural alignment during similarity comparisons. Cognitive Psychology 25(4):431–67.

A. B. Markman & D. Gentner (2000) Structure mapping in the comparison process. American Journal of Psychology 113(4):501–38.

A. B. Markman & C. H. Stilwell (2001) Role-governed categories. Journal of Experimental and Theoretical Artificial Intelligence 13(4):329–58.

T. Matsuzawa (2001) Primate origins of human cognition and behavior Springer.

J. L. McClelland & D. C. Plaut (1999) Does generalization in infant learning implicate abstract algebra-like rules? Trends in Cognitive Sciences 3:166–68.

R. Menzel , U. Greggers , A. Smith , S. Berger , R. Brandt , S. Brunke , G. Bundrock , S. Hülse , T. Plümpe , F. Schaupp , E. Schüttler , S. Stach , J. Stindt , N. Stollhoff & S. Watzl (2005) Honeybees navigate according to a map-like spatial memory. Proceedings of the National Academy of Sciences USA 102(8):3040–45.

E. Mercado III, D. A. Killebrew , A. A. Pack , I. I. Macha & L. M. Herman (2000) Generalization of “same-different” classification abilities in bottlenosed dolphins. Behavioural Processes 50 (2–3):7994.

R. G. Morrison , D. C. Krawczyk , K. J. Holyoak , J. E. Hummel , T. W. Chow , B. L. Miller & B. J. Knowlton (2004) A neurocomputational model of analogical reasoning and its breakdown in frontotemporal lobar degeneration. Journal of Cognitive Neuroscience 16(2):260–71.

N. J. Mulcahy & J. Call (2006b) How great apes perform on a modified trap-tube task. Animal Cognition 9(3):193–99.

G. L. Murphy & D. L. Medin (1985) The role of theories in conceptual coherence. Psychological Review 92:289316.

L. L. Namy & D. Gentner (2002) Making a silk purse out of two sow's ears: Young children's use of comparison in category learning. Journal of Experimental Psychology 131:515.

A. Newell (1980) Physical symbol systems. Cognitive Science 4:135–83.

A. Newell & H. A. Simon (1976) Computer science as empirical inquiry: Symbols and search. Communications of the ACM 19:113–26.

L. Niklasson & T. van Gelder (1994) On being systematically connectionist. Mind and Language 9(3):288302.

Y. M. C. G. Paz , A. B. Bond , A. C. Kamil & R. P. Balda (2004) Pinyon jays use transitive inference to predict social dominance. Nature 430(7001):778–81.

D. C. Penn & D. J. Povinelli (2007a) Causal cognition in human and nonhuman animals: A comparative, critical review. Annual Review of Psychology 58:97118.

D. C. Penn & D. J. Povinelli (2007b) On the lack of evidence that non-human animals possess anything remotely resembling a “theory of mind.” Philosophical Transactions of the Royal Society B 362:731–44.

I. M. Pepperberg (1987) Acquisition of the same/different concept by an African grey parrot (Psittacus erithacus): Learning with respect to categories of color, shape and material. Animal Learning and Behavior 15:423–32.

P. Perruchet & S. Pacton (2006) Implicit learning and statistical learning: One phenomenon, two approaches. Trends in Cognitive Sciences 10(5):233–38.

C. C. Peterson & M. Siegal (2000) Insights into theory of mind from deafness and autism. Mind and Language 15(1):123–45.

J. Piaget (1928) Judgment and reasoning in the child Kegan, Paul, Trench and Trubner.

S. Pinker (2005) So how does the mind work? Mind and Language 20(1):124.

S. Pinker & R. Jackendoff (2005) The faculty of language: What's special about it? Cognition 95:201–36.

S. Pinker & A. Prince (1988) On language and connectionism: Analysis of a parallel distributed processing model of language acquisition. Cognition 28:73193.

T. Plate (2000) Analogy retrieval and processing with distributed vector representations. Expert Systems: The International Journal of Knowledge Engineering and Neural Networks 17(1):2940.

J. B. Pollack (1990) Recursive distributed representations. Artificial Intelligence 46 (1–2):77106.

D. J. Povinelli (2004) Behind the apes' appearance: Escaping anthropomorphism in the study of other minds. Daedalus: Journal of the American Academy of Arts and Sciences Winter:2941.

D. J. Povinelli , J. M. Bering & S. Giambrone (2000) Toward a science of other minds: Escaping the argument by analogy. Cognitive Science 24(3):509–41.

D. J. Povinelli & S. Dunphy-Lelii (2001) Do chimpanzees seek explanations? Preliminary comparative investigations. Canadian Journal of Experimental Psychology 55(2):187–95.

D. J. Povinelli & S. Giambrone (2001) Reasoning about beliefs: A human specialization? Child Development 72(3):691–95.

D. J. Povinelli & T. M. Preuss (1995) Theory of mind: Evolutionary history of a cognitive specialization. Trends in Neurosciences 18(9):418–24.

D. J. Povinelli & J. Vonk (2003) Chimpanzee minds: Suspiciously human? Trends in Cognitive Sciences 7(4):157–60.

D. J. Povinelli & J. Vonk (2004) We don't need a microscope to explore the chimpanzee's mind. Mind and Language 19(1):128.

D. Premack (1983a) Animal cognition. Annual Review of Psychology 34:351–62.

D. Premack (2007) Human and animal cognition: Continuity and discontinuity. Proceedings of the National Academy of Sciences USA 104:13861–67.

T. M. Preuss (2006) Who's afraid of Homo sapiens? Journal of Biomedical Discovery and Collaboration 1:17.

J. Prinz & A. Clark (2004) Putting concepts to work: Some thoughts for the 21st century. Mind and Language 19(1):5769.

M. J. Rattermann & D. Gentner (1998a) More evidence for a relational shift in the development of analogy: Children's performance on a causal-mapping task. Cognitive Development 13(4):453–78.

A. S. Reber (1967) Implicit learning of artificial grammars. Journal of Verbal Learning and Behavior 6:855–63.

M. Redington & N. Chater (1996) Transfer in artificial grammar learning: A reevaluation. Journal of Experimental Psychology: General 125(2):123–38.

L. Rendell & H. Whitehead (2001) Culture in whales and dolphins. Behavioral and Brain Sciences 24:309–82.

L. E. Richland , R. G. Morrison & K. J Holyoak (2006) Children's development of analogical reasoning: Insights from scene analogy problems. Journal of Experimental Child Psychology 94(3):249–73.

W. Sandler , I. Meir , C. Padden & M. Aronoff (2005) From the cover: The emergence of grammar: Systematic structure in a new language. Proceedings of the National Academy of the Sciences USA 102:2661–65.

L. R. Santos , A. G. Nissen & J. A. Ferrugia (2006) Rhesus monkeys, Macaca mulatta, know what others can and cannot hear. Animal Behaviour 71(5):1175–81.

R. Saxe (2006) Uniquely human social cognition. Current Opinion in Neurobiology 16(2):235–39.

R. Saxe , J. B. Tenenbaum & S. Carey (2005) Secret agents: Inferences about hidden causes by 10- and 12-month-old infants. Psychological Science 16(12):9951001.

R. J. Schusterman & K. Krieger (1986) Artificial language comprehension and size transportation by a California sea lion (Zalopbas californianas). Journal of Comparative Psychology 100:348–55.

A. M. Seed , S. Tebbich , N. J. Emery & N. S. Clayton (2006) Investigating physical cognition in rooks (Corvus frugilegus). Current Biology 16:697701.

M. S. Seidenberg & J. L. Elman (1999) Do infants learn grammar with algebra or statistics? Science 284:434–35.

A. Senghas , S. Kita & A. Ozyurek (2004) Children creating core properties of language: Evidence from an emerging sign language in Nicaragua. Science 305:1779–82.

R. M. Seyfarth , D. L. Cheney & T. J. Bergman (2005) Primate social cognition and the origins of language. Trends in Cognitive Sciences 9(6):264–66.

M. Siegal , R. Varley & S. C. Want (2001) Mind over grammar: Reasoning in aphasia and development. Trends in Cognitive Sciences 5(7):296301.

J. B. Silk (1999) Male bonnet macaques use information about third-party rank relationships to recruit allies. Animal Behaviour 58:4551.

J. B. Silk (2002a) Kin selection in primate groups. International Journal of Primatology 23(4):849–75.

J. D. Smith , W. E. Shields & D. A. Washburn (2003) The comparative psychology of uncertainty monitoring and metacognition. Behavioral and Brain Sciences 26:317–73.

P. Smolensky (1990) Tensor product variable binding and the representation of symbolic structures in connectionist systems. Artificial Intelligence 46:159216.

P. F. Strawson (1959) Individuals Methuen.

T. Suddendorf & M. C. Corballis (2007a) The evolution of foresight: What is mental time travel and is it unique to humans? Behavioral and Brain Sciences 30(3):299313.

S. Tebbich , A. M. Seed , N. J. Emery & N. S. Clayton (2007) Non-tool-using rooks (Corvus frigilegus) solve the trap-tube task. Animal Cognition 10(2):225–31.

J. B. Tenenbaum , T. L. Griffiths & S. Niyogi (2007) Intuitive theories as grammars for causal inference. In: Causal learning: Psychology, philosophy, and computation, ed. A. Gopnik & L. Schulz . Oxford University Press.

R. K. R. Thompson & D. L. Oden (2000) Categorical perception and conceptual judgments by nonhuman primates: The paleological monkey and the analogical ape. Cognitive Science 24:363–96. (Special issue on Primate Cognition; guest editor, M. Tomasello.)

M. Tomasello (2000) Do young children have adult syntactic competence? Cognition 74(3):209–53.

M. Tomasello , J. Call & B. Hare (2003a) Chimpanzees understand psychological states – The question is which ones and to what extent. Trends in Cognitive Sciences 7(4):153–56.

M. Tomasello , J. Call & B. Hare (2003b) Chimpanzees versus humans: It's not that simple. Trends in Cognitive Sciences 7(6):239–40.

M. Tomasello , M. Carpenter , J. Call , T. Behne & H. Moll (2005) Understanding and sharing intentions: The origins of cultural cognition. Behavioral and Brain Sciences 28:675–91.

M. Tomasello & H. Rakoczy (2003) What makes human cognition unique? From individual to shared to collective intentionality. Mind and Language 18(2):121–47.

T. van Gelder (1990) Compositionality: A connectionist variation on a classical theme. Cognitive Science 14:355–84.

T. van Gelder (1995) What might cognition be, if not computation? The Journal of Philosophy 92(7):345–81.

T. van Gelder (1998) The dynamical hypothesis in cognitive science. Behavioral and Brain Sciences 21(5):615–28.

R. A. Varley , N. J. Klessinger , C. A. Romanowski & M. Siegal (2005) Agrammatic but numerate. Proceedings of the National Academy of Sciences USA 102(9):3519–24.

R. A. Varley & M. Siegal (2000) Evidence for cognition without grammar from causal reasoning and “theory of mind” in an agrammatic aphasic patient. Current Biology 10(12):723–26.

R. A. Varley , M. Siegal & S. C. Want (2001) Severe impairment in grammar does not preclude theory of mind. Neurocase 7(6):489–93.

E. Visalberghi & L. Limongelli (1994) Lack of comprehension of cause-effect relations in tool-using capuchin monkeys (Cebus apella). Journal of Comparative Psychology 108:1522.

E. Visalberghi & M. Tomasello (1998) Primate causal understanding in the physical and psychological domains. Behavioural Processes 42 (2–3):189203.

J. Vonk (2003) Gorilla (Gorilla gorilla gorilla) and orangutan (Pongo abelii) understanding of first and second order relations. Animal Cognition 6:7786.

M. R. Waldmann & K. J. Holyoak (1992) Predictive and diagnostic learning within causal models: Asymmetries in cue competition. Journal of Experimental Psychology: General 121:222–36.

J. A. Waltz , B. J. Knowlton , K. J. Holyoak , K. B. Boone , C. Back-Madruga , S. McPherson , D. Masterman , T. Chow , J. L. Cummings & B. L. Miller (2004) Relational integration and executive function in Alzheimer's disease. Neuropsychology 18(2):296305.

J. A. Waltz , B. J. Knowlton , K. J. Holyoak , K. B. Boone , F. S. Mishkin , M. de M. Santos , C. R. Thomas & B. L. Miller (1999) A system for relational reasoning in human prefrontal cortex. Psychological Science 10(2):119–25.

E. A. Wasserman & L. Castro (2005) Surprise and change: Variations in the strength of present and absent cues in causal learning. Learning and Behavior 33(2):131–46.

E. A. Wasserman , M. E. Young & R. G. Cook (2004) Variability discrimination in humans and animals: Implications for adaptive action. American Psychologist 59(9):879–90.

E. A. Wasserman , M. E. Young & J. Fagot (2001) Effects of number of items on the baboon's discrimination of same from different visual displays. Animal Cognition 4:163–70.

A. A. S. Weir & A. Kacelnik (2007) A New Caledonian crow (Corvus moneduloides) creatively re-designs tools by bending or unbending aluminium strips. Animal Cognition 9(4):317–34.

G. C. Westergaard & S. J. Suomi (1994) Hierarchical complexity of combinatorial manipulation in capuchin monkeys (Cebus apella). American Journal of Primatology 32(3):171–76.

A. Whiten (1996) When does behaviour-reading become mind-reading. In: Theories of theory of mind, ed. P. Carruthers & P. K. Smith . Cambridge University Press.

B. C. Wright (2001) Reconceptualizing the transitive inference ability: A framework for existing and future research. Developmental Review 21(4):375422.

C. D. L. Wynne (1995) Reinforcement accounts for transitive inference performance. Animal Learning and Behavior 23(2):207–17.

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Behavioral and Brain Sciences
  • ISSN: 0140-525X
  • EISSN: 1469-1825
  • URL: /core/journals/behavioral-and-brain-sciences
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