Sociality and Social Behaviour (Part 2). Reciprocity - incur a cost now in anticipation of receiving a benefit later. Altruism by non-relatives. Modelling - use Game Theory - John Nash. Prisoner ’ s Dilemma. Altruism by non-relatives. 2 prisoners - caught and jailed for a petty crime.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Reciprocity - incur a cost now in anticipation of receiving a benefit later
Modelling - use Game Theory - John Nash
Each strategy has a payoff
Payoff depends on behaviour of the opponent
1. Both cooperate - both get a reward - R
2. Both defect - both get punished - P
3. One cooperates & one defects
- defector set free - T (temptation payoff)
- cooperator jailed - S (sucker’s payoff)
What are the years saved by each strategy?
S = 0
R = 10
T = 12
P = 2
Some predictions from reciprocity hypothesis:
Regular rotation of sentinel duty
Sentinel duty appears to be haphazard
Sentinel duty has risk of succumbing to predator
Sentinels are usually closer to an escape burrow
Less time is spent in predator detection in groups
No difference in sentinel time when solitary