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Title: Artificial Life/Iterated Prisoner Dilemma - The Prisoner's Dilemma A simple yet powerful model for the problem of cooperation versus conflict in groups. The JAVA applet demonstrates the spread of 'altruism' and 'exploitation for personal gain.'
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The Prisoner's Dilemma

The Prisoner's Dilemma

by Serge HelfrichThe spatial variant of the iterated prisoner's dilemma is a simple yet powerful model for the problem of cooperation versus conflict in groups. The applet below demonstrates the spread of'altruism' and 'exploitation for personal gain' in an interacting population of individuals learning from each other by experience. Initially the population consists of cooperators and acertain amount of defectors (a fraction represented by p). The advantage of defection is determined by the the value of b in the 'payoff matrix' (see below) which is used to calculate the payoff after each round for each 'player' on the basis of its strategy. For the nextround a player determines its new strategy by selecting the most favourable strategy from itself and its direct neighbours.You can use the links below to learn more about this fascinating topic in 'game theory': The iterated prisoner's dilemma - A very brief introduction to the problem as studied by AxelrodThe prisoner's dilemma: A Fable - Bonnie and ClydePrisoner's dilemma (Stanford Encyclopedia of Philosophy)The Prisoner's Dilemma (Principia Cybernetica Web)The Ethical Spectacle - About movies, love, holocausts and more...Prisoner's dilemma - A list of links by the Constitution site Undecidability in the spatialized prisoner's dilemma - some philosophical implications (recommended)Prisoner's Dilemma - Alife DatabaseGame Theory .net - A resource for educators and students of game theoryBiological basis for human cooperation - Functional MRI scans have revealed a "biologically embedded" basis for altruistic behaviour. (Emory University.) Reintroducing group selection to the human behavioral sciences - A preprint of the article by Wilson and Sober in BBS (1994, 17, 585-654). Groups as levels of selection? Could group-interest dominate self-interest in evolution? And what does game theory have to do with this? Shop at Amazon.com Shop at Amazon.com demonstration appletBTW I stole the idea for this applet from A.L. Lloyd (Sci. Amer., June 1995, 80-83). the payoff matrixopponentcooperatedefectplayercooperate10defectb0Legendis cooperating, did cooperateis defecting, did defectis cooperating, did defectis defecting, did cooperateb: advantage for defection when opponent cooperatesp: fraction (0..1) of defectors in the first roundApplet FAQApplet source codeGet Java if the applet does not start: Get Javasuggested experimentsTry different b values between 1.00 and 3.00. Find out how the behavior changes. When do defectors tend to be isolated and when do they form interconnected structures around movingcolonies of cooperators?To see the gradual defector invasion pattern choose a low value for p (like 0.001) and a b value about 1.85... and if you're lucky enough to start with just one defector you'll get the kaleidoscope.Chen figures. Rowland Chen discovered that if you use b = 1.9 and p = 0.6 a "walking man" will appear in about 1 out of 20 runs. Also a "crawling bug" can emerge. A stable figure that looks like a rotating F appears more often. Rory Plaire noted that some interesting patterns emerge when b = 1.800000015 and p = 0.5, e.g. the "crawling bug" (or "walking man" seen from above) making the kaleidoscope explode. The FAQ may be helpful in explaining these phenomena.[...]
 

A

simple

yet

powerful

model

for

the

problem

of

cooperation

versus

conflict

in

groups.

The

JAVA

applet

demonstrates

the

spread

of

'altruism'

and

'exploitation

for

personal

gain.'

http://prisonersdilemma.groenefee.nl/

The Prisoner's Dilemma 2008 October

dvd rental

dvd


A simple yet powerful model for the problem of cooperation versus conflict in groups. The JAVA applet demonstrates the spread of 'altruism' and 'exploitation for personal gain.'

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