Responder’s specific ERP cognitive component in the ultimatum game
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1
LABEX, Department of Information Systems, Faculty of Business and Economics, University of Lausanne, Switzerland
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2
Division of Geriatric Psychiatry, Department of Psychiatry, University Hospitals of Geneva, Switzerland
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3
Unité d'Anatomie, Département de Médecine, Université de Fribourg, Switzerland
Emotional aspects of economic decision-making are widely investigated but the associated cognitive processes and their underlying temporal dynamics are poorly understood. In the Ultimate Game (UG) task a Subject (the proposer) offers a portion of a fixed amount of money to a responder partner (in our study the computer) aiming to keep the rest. The responder can either accept the offer (in which case both players split the money as proposed) or reject the offer (in which case both players get nothing). In the present study, we recorded EEG (64 electrodes 10/20 IS, at a resolution of 2048 digitazion rate) and we investigate ERPs of subjects in a two conditions variant of UG. In the first Block (120 trials) human players acted as proposers (HP) and in the next Block (120 trials) humans acted as responders (HR). Low gains offers were generally rejected in both conditions. ERP comparison between HP and HR shows a decrease in latency of the P2-N2 components in HP and a positive-negative waveform in particular on derivations Cz and Fz. This HP related-component occurred in 150-300 ms range after stimulus onset. Such short latencies of components preceding execution-related processes strongly suggests that the observed positive-negative component is specific for HP processes. A proposer, in contrast to a responder, has to store the future proposed value in short-term memory and engage retrieval processes after getting the responder’s reaction. EEG studies revealed that this retrieval process activates distinct neuronal populations in the time-range of 150-300 ms. We suggest that our results support the hypothesis that while playing the role of proposers human subjects engage into this specific cognitive process while performing UG.
Keywords:
decision-making,
EEG
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Decision Making, Reward Processing & Response Selection
Citation:
Missonier
P,
Shaposhnyk
V,
Lintas
A and
Villa
AE
(2011). Responder’s specific ERP cognitive component in the ultimatum game.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00383
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Received:
24 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Pascal Missonier, LABEX, Department of Information Systems, Faculty of Business and Economics, University of Lausanne, Lausanne, Switzerland, pascal.missonnier-evrard@hcuge.ch