Colloquium paper: adaptive specializations, social exchange, and the evolution of human intelligence.
Blank-slate theories of human intelligence propose that reasoning is carried out by general-purpose operations applied uniformly across contents. An evolutionary approach implies a radically different model of human intelligence. The task demands of different adaptive problems select for functionally specialized problem-solving strategies, unleashing massive increases in problem-solving power for ancestrally recurrent adaptive problems. Because exchange can evolve only if cooperators can detect cheaters, we hypothesized that the human mind would be equipped with a neurocognitive system specialized for reasoning about social exchange. Whereas humans perform poorly when asked to detect violations of most conditional rules, we predicted and found a dramatic spike in performance when the rule specifies an exchange and violations correspond to cheating. According to critics, people's uncanny accuracy at detecting violations of social exchange rules does not reflect a cheater detection mechanism, but extends instead to all rules regulating when actions are permitted (deontic conditionals). Here we report experimental tests that falsify these theories by demonstrating that deontic rules as a class do not elicit the search for violations. We show that the cheater detection system functions with pinpoint accuracy, searching for violations of social exchange rules only when these are likely to reveal the presence of someone who intends to cheat. It does not search for violations of social exchange rules when these are accidental, when they do not benefit the violator, or when the situation would make cheating difficult.
Cosmides
Leda
L
Center for Evolutionary Psychology, University of California, Santa Barbara, CA 93106, USA. cosmides@psych.ucsb.edu
Barrett
H Clark
HC
Tooby
John
J
D000465:Algorithms; D001519:Behavior; D005075:Biological Evolution; D003071:Cognition; D004989:Ethics; D006801:Humans; D007360:Intelligence; D008954:Models, Biological; D012919:Social Behavior
Cognition. 2000 Oct 16;77(1):1-79
10980253
Sci Am. 1978 Apr;238(4):90-108
418504
Cognition. 1999 Oct 26;72(3):269-304
10519925
Mem Cognit. 2001 Jul;29(5):757-64
11531230
Neuroimage. 2005 Dec;28(4):778-86
15994098
Cognition. 2000 Apr 14;75(1):29-32
10815776
J Theor Biol. 2003 Sep 7;224(1):115-26
12900209
Soc Neurosci. 2006;1(3-4):196-219
18633788
Cogn Psychol. 1985 Oct;17(4):391-416
4064622
Am Psychol. 2003 Sep;58(9):697-720
14584987
Cognition. 1991 May;39(2):85-105
1934982
Cognition. 1994 Jan;51(1):1-28
8149715
Behav Brain Sci. 2006 Dec;29(6):595-613; discussion 613-50
17918647
Cognition. 1992 May;43(2):127-71
1617917
Proc Natl Acad Sci U S A. 2002 Aug 20;99(17):11531-6
12177408
Psychol Rev. 2000 Apr;107(2):289-344
10789198
Cognition. 1989 Dec;33(3):285-313
2605884
Cognition. 1989 Apr;31(3):187-276
2743748
Neuroimage. 2007 Apr 15;35(3):1385-91
17331743
Q J Exp Psychol A. 2004 Apr;57(3):447-74
15204136
Proc Natl Acad Sci U S A. 2002 Aug 20;99(17):11537-42
12177409
Cognition. 1995 Oct;57(1):31-95
7587018