PowerPoint Presentation - 11. Cooperation and Altruism

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PowerPoint Presentation - 11. Cooperation and Altruism Powered By Docstoc
					Evolutionary Psychology
A. Reciprocal Altruism
B. Human Mate Selection
A. Reciprocal Altruism
Reciprocal Altruism (reciprocity)
An action by an individual (the donor) that helps
another individual (the recipient), and that is subsequently
repaid by the recipient.

Conditions necessary for reciprocal altruism to evolve:
Opportunities for repayment
Individual recognition
Discrimination against cheaters
Benefit to the recipient > cost to the actor
           Prisoner’s Dilemma
Self (Coop) Coop (Coop)   Self (Self)   Coop (Self)

 5             3               -3             -5
 I___________I____________I__________I
No         Light           Medium       Long
sentence   sentence        sentence     sentence

Maximum                                 Maximum
Benefit                                 Cost
B. Human Mate Selection
(David M. Buss, 1998)
Willingness to have sexual intercourse (measured on a scale from
3, definitely yes, to -3, definitely no) differs for men and women
with respect to the length of time they have been acquainted with
their prospective mate. Women are significantly less inclined to
have sex with a prospective mate for all shorter lengths of time.
                 HUMAN MATE PREFERENCES

Mate preferences by females           Mate preferences by males
    • age (older)                        • age (younger)
    • status                             • health & physical beauty
    • intelligence/education             … the latter =
    • dependability/reliability             low waist-hip ratio
    • support                               infantile facial features
* All things associated with better   * All things associated with female
   resource access for females          fertility

				
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posted:9/2/2012
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