In one-shot social dilemma experiments, cooperation rates dramatically increase if subjects are allowed to communicate before making a choice. There are two possible explanations for this `communication effect'. One is that communication enhances group identity, the other is that communication elicits social norms. I discuss both views and argue in favor of a norm-based explanation.
Allison, S.T.
and N.L. Kerr. 1994. `Group Correspondence Biases and the Provision of Public Goods.' Journal of Personality and Social Psychology21: 563-579.
2.
Bartlett, F.C.1932. Remembering: a Study in Experimental and Social Psychology. Cambridge: Cambridge University Press.
3.
Bicchieri, C.1990. `Norms of Cooperation.' Ethics100: 838-861.
4.
Bicchieri, C.1997. `Learning to Cooperate.' In The Dynamics of Norms, eds. C. Bicchieri, R. Jeffrey and B. Skyrms. Cambridge: Cambridge University Press.
5.
Bicchieri, C.2000. `Words and Deeds: a Focus Theory of Norms.' In Rationality, Rules and Structure, eds. J. Nida-Rumelin and W. Spohn. Dordrecht: Kluwer Academic Publishers.
6.
Bornstein, G.1992. `The Free Rider Problem in Intergroup Conflicts Over Step-level and Continuous Public Goods.' Journal of Personality and Social Psychology62: 597-602.
7.
Bouas, K.S.
and S.S. Komorita. 1996. `Group Discussion and Cooperation in Social Dilemmas.' Personality and Social Psychology Bulletin22: 1144-1150.
8.
Brewer, M.1979. `Ingroup Bias in the Minimal Intergroup Situation: A Cognitive Motivational Analysis.' Psychological Bulletin86: 307-324
9.
Brewer, M.1991. `The Social Self: On Being the Same and Different at the Same Time.' Personality and Social Psychology Bulletin17: 475-482.
10.
Brewer, M.B.
and R.M. Kramer. 1986. `Choice Behavior in Social Dilemmas: Effects of Social Identity, Group Size, and Decision Framing.' Journal of Personality and Social Psychology50: 543-549.
11.
Camerer, C.
and R. Thaler. 1995. `Anomalies: Ultimatums, Dictators and Manners.' Journal of Economic Perspectives9: 209-219.
12.
Cialdini, R.
, C. Kallgren and R. Reno. 1990. `A Focus Theory of Normative Conduct: a Theoretical Refinement and Reevaluation of the Role of Norms in Human Behavior.' Advances in Experimental Social Psychology24: 201-234.
13.
Dawes, R.1980. `Social Dilemmas.' Annual Review of Psychology31: 169-193.
14.
Dawes, R.
, J. McTavish and H. Shaklee. 1977. `Behavior, Communication, and Assumptions About Other People's Behavior in a Commons Dilemma Situation.' Journal of Personality and Social Psychology35: 1-11.
15.
Dawes, R.
, J. Orbell, R. Simmons and A. van de Kragt. 1986. `Organizing Groups for Collective Action.' American Political Science Review80: 1171-1185.
16.
Dawes, R.
, J. Orbell and A. van de Kragt. 1988. `Not Me or Thee But We: The Importance of Group Identity in Eliciting Cooperation in Dilemma Situations.' Acta Psychologica68: 83-97.
17.
Dawes, R.
, A. van de Kragt and J. Orbell. 1990. `Cooperation for the Benefit of Us, Not Me, or My Conscience.' In Beyond Self-interest, ed. J. Mansbridge. Chicago, IL: University of Chicago Press.
18.
Estes W.K.1986. `Memory Storage and Retrieval Processes in Category Learning.' Journal of Experimental Psychology115: 155-174.
19.
Fiske, S.T.
and S.L. Neuberg. 1990. `A Continuum of Impression Formation, from Category-based to Individuating Processes: Influences of Information and Motivation on Attention and Interpretation.' In Advances in Experimental Social Psychology, vol. 23, ed. L. Berkowitz. New York: Academic Press.
20.
Fiske, S.T.
and S.E. Taylor. 1991. Social Cognition. New York: McGraw-Hill.
21.
Hertel, G.
and N. Kerr. 2001. `Priming Ingroup Favoritism: The Impact of Normative Scripts in the Minimal Group Paradigm.' Journal of Experimental Social Psychology37: 316-324.
22.
Hinkle, S.
, L. Taylor, D. Fox-Cardamone and K. Crook. 1989. `Intragroup Identification and Intergroup Differentiation: a Multi-Component Approach.' British Journal of Social Psychology28: 305-317.
23.
Hogg, M.A.
and J.C. Turner. 1987. `Social Identity and Conformity: a Theory of Referent Informational Influence.' In Current Issues in European Social Psychology, vol. 2, eds. W. Doise and S. Moscovici. Cambridge: Cambridge University Press.
24.
Insko, C.A.
and J. Schopler. 1987. `Categorization, Competition, and Collectivity.' In Review of Personality and Social Psychology: Group Processes, vol. 8, ed. C. Hendrick. Beverly Hills, CA: Sage.
25.
Issac, R.
and J. Walker. 1988. `Communication and Free-Riding Behavior: The Voluntary Contribution Mechanism.' Economic Inquiry26: 585-608.
26.
Jetten, J.
, R. Spears and A.S.R. Manstead. 1996. `Intergroup Norms and Intergroup Discrimination: Distinctive Self-Categorization and Social Identity Effects.' Journal of Personality and Social Psychology71: 1222-1233.
27.
Jones, E.
and R. Nisbett. 1972. `The Actor and the Observer: Divergent Perceptions of the Causes of Behavior'. In Attribution: Perceiving the Causes of Behavior, ed. E. Jones et al. Morristown, NJ: General Learning Press.
28.
Kahneman, D.
and A. Tversky. 1973. `Availability: A Heuristic for Judging Frequency and Probability.' Cognitive Psychology5: 207-232.
29.
Kerr, N.
and C. Kaufman-Gilliland. 1994. `Communication, Commitment, and Cooperation in Social Dilemmas.' Journal of Personality and Social Psychology66: 513-529.
30.
Kerr, N.
, J. Garst, D.A. Lewandowski and S.E. Harris. 1997. `The Still, Small Voice: Commitment to Cooperate as an Internalized versus a Social Norm.' Personality and Social Psychology Bulletin23: 1300-1311.
31.
Kiesler, S.
, L. Sproull and K. Waters. 1996. `A Prisoner's Dilemma Experiment on Cooperation with People and Human-like Computers.' Journal of Personality and Social Psychology70: 47-65.
32.
Kramer, R.M.
and M.B. Brewer. 1984. `Effects of Group Identity on Resource Use in a Simulated Commons Dilemma.' Journal of Personality and Social Psychology46: 1044-1057.
33.
Kramer, R.M.
and M.B. Brewer. 1986. `Social Group Identity and the Emergence of Cooperation in Resource Conservation Dilemmas.' In Psychology of Decisions and Conflict: Experimental Social Dilemmas, eds. H.A. Wilke et al. Frankfurt: Verlag Peter Lang.
34.
Mackie, G. 1997. “`Noncredible” Social Contracts Are Credible: Communication and Commitment in Social Dilemma Experiments.' Unpublished paper, Mimeo.
35.
Nisbett, R.
, and T. Wilson. 1977. `Telling More Than We Can Know: Verbal Reports on Mental Processes.' Psychological Review84: 231-259.
36.
Orbell, J.
, A. van de Kragt and R. Dawes. 1988. `Explaining Discussion-Induced Cooperation.' Journal of Personality and Social Psychology54: 811-819.
37.
Orbell, J.
, A. van de Kragt and R. Dawes. 1991. `Covenants Without the Sword: The Role of Promises in Social Dilemma Circumstances.' In Social Norms and Economic Institutions, eds. I.K. Koford and D.J. Miller. Ann Arbor, MI: University of Michigan Press.
38.
Orbell, J.
and R. Dawes. 1993. `Social Welfare, Cooperators' Advantage, and the Option of Not Playing the Game.' American Sociological Review58: 787-800.
39.
Pillutla, M. and X.P. Chen. 1999. `Social Norms and Cooperation: The Effects of Context and Feedback.' In Organizational Behaviour and Human Decision Process, Mimeo.
40.
Rosch, E.1978. `Principles of Categorization'. In Cognition and Categorization, eds. E. Rosch and B. Lloyd. Hillsdale, NJ: Erlbaum.
41.
Sally, D.1995. `Conversation and Cooperation in Social Dilemmas.' Rationality and Society7: 58-92.
42.
Schank, R.
and R. Abelson. 1977. Scripts, Plans, Goals and Understanding. Hillsdale, NJ: Erlbaum.
43.
Schopler, J.
and C.A. Insko. 1992. `The Discontinuity Effect in Interpersonal and Intergroup Relations: Generality and Mediation'. In European Review of Social Psychology, vol. 3, eds. W. Stroebe and M. Hewstone, pp. 121-151. New York: John Wiley.
44.
Schroeder, D.A.
, T.D. Jensen, A.J. Reed, D.K. Sullivan and M. Schwab. 1983. `The Actions of Others as Determinants of Behavior in Social Trap Situations.' Journal of Experimental Social Psychology19: 522-539.
45.
Sherif, M.1966. In Common Predicament. Boston, MA: Houghton Mifflin.
46.
Tajfel, H.1973. `The Roots of Prejudice: Cognitive Aspects.' In Psychology and Race, ed. P. Watson. Harmondsworth: Penguin.
47.
Tajfel, H.1970. `Experiments in Itergroup Discrimination.' Scientific American223: 96-102.
48.
Tajfel, H.
, M. Billig, R. Bundy and C. Flament. 1971. `Social Categorization in Intergroup Behavior.' European Journal of Social Psychology1: 149-178.
49.
Tajfel, H.1982. `Social Psychology of Intergroup Relations.' Annual Review of Psychology33: 1-30.
50.
Tetlock, P.E.
and R. Boettger. 1989. `Accountability: a Social Magnifier of the Dilution Effect'. Journal of Personality and Social Psychology57: 388-398.
51.
Thaler, R.1992. The Winner's Curse: Paradoxes and Anomalies in Economic Life. New York: Free Press.
52.
Turner, J.C.
et al. 1987. Rediscovering the Social Group: A Self-Categorization Theory, Oxford: Blackwell.
53.
Yamagishi, T.
, N. Jin and T. Kiyonari. 1999. `Bounded Generalized Reciprocity: Ingroup Boasting and Ingroup Favoritism.' Advances in Group Processes16: 161-197.
