Lecture-27-Slides - 11/3/08 Human Cooperation Pat Barclay...

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11/3/08 1 Human Cooperation Pat Barclay October 31 st , 2008 The Puzzle of Altruism Conferring benefits on others carries fitness costs This puts altruists at a selective disadvantage
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11/3/08 2 Generation N A A A N A A N A A N N N A N N A N N Start with non-altruists Start with altruists N N N A N N N N N N A N N N A N A N Generation N+1 N N N N N N N N N N N N N N N N N N Generation N+2 Visual: Invasion by Defectors Question: Why does altruism exist? Why do some animals have decision rules that cause them to be altruistic, and under what circumstances are they?
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11/3/08 3 Human and Non-Human Cooperation Inclusive fitness (kinship) is an important factor in many non-human species Traditionally, humans have lived in kin-based groups Kinship is a good predictor of alliances and cooperation Altruism Toward Non-Kin Humans are generous towards non-kin, more so than most (or all!) other species Why help non-kin? Modern examples: giving blood tipping Ancestral examples: food sharing alliances
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11/3/08 4 Imagine This… You and an accomplice are being interrogated by the police for a crime you committed together. They have enough evidence to convict you of lesser offences (1 year), but want to convict you of more serious offences. They offer you a deal: “If neither of you talks, we can get you both for 1 year each. We want you to defect on your accomplice by confessing. If you do, and he/she stays silent, then he/she will get 10 years, and you’ll go free. But if you both confess, then you both get 5 years.” You know that your partner is offered the same deal, and you have no way of communicating an intention to cooperate with each other (i.e. an intention to stay silent). Do you confess?
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This note was uploaded on 04/07/2009 for the course BIO 2210 taught by Professor Seeley during the Fall '08 term at Cornell University (Engineering School).

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Lecture-27-Slides - 11/3/08 Human Cooperation Pat Barclay...

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