lec8_neurecon_p2

lec8_neurecon_p2 - 14.127 Lecture 8. Crossroads of...

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Unformatted text preview: 14.127 Lecture 8. Crossroads of economics and cognitive science Xavier Gabaix April 1, 2004 Ultimatum Game 1. Proposer (P) proposes x 2. Receiver (R) accepts or rejects 3. If R rejected both get 0, if R accepted, R gets x, and P gets 10-x Sanfey and Cohens ultimatum experiment (Sanfey et al 2003, Science, v. 300, p. 1755) 30 subjects neuroimaged (fMRI) in the responder position of the ultimatum game Particular neural loci are disproportionately activated when subjects receive unfair offers from humans (as opposed to fair offers from humans or fair and unfair offers from computers) Bilateral anterior insula Anterior cingulate cortex Right dorsolateral prefontal cortex Disproportionate right anterior insula activation correlates with the decision to reject unfair offers from humans (affective neural locus) Reveal Fixation Reveal Partner Reveal Offer Reveal Options Reveal Outcome Subject Decides + Acceptance Rates 10 20 30 40 50 60 70 80 90 100 $5:$5 $7:$3 $8:$2 $9:$1 Offer Kelly gets $8 You get $2 Kelly gets $0 You get $0 Accept Reject 12 sec 6 sec 6 sec 6 sec 6 sec A B B) Behavioral results from the Ultimatum Game....
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lec8_neurecon_p2 - 14.127 Lecture 8. Crossroads of...

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