Technical Program

Paper Detail

Paper: PS-1B.30
Session: Poster Session 1B
Location: Symphony/Overture
Session Time: Thursday, September 6, 18:45 - 20:45
Presentation Time:Thursday, September 6, 18:45 - 20:45
Presentation: Poster
Paper Title: Reevaluating revaluation: evidence for value construction during decision making
Manuscript:  Click here to view manuscript
Authors: Akram Bakkour, Ariel Zylberberg, Michael Shadlen, Daphna Shohamy, Columbia University, United States
Abstract: The speed and accuracy of value-based decisions conform to regularities of bounded evidence accumulation. However, the source of the samples of evidence remains unknown. One possibility is that internal evidence is derived from memory. In particular, that episodic memory retrieval may play a role in value construction during the decision process. We reasoned that if memory contributes to constructing preference, choice options may undergo revaluation as a consequence of the decision. We tested this using an algorithm that supposes the chosen and unchosen items change value by +/-δ. The revised values better accounted for behavior (choices and reaction time) compared to the original values. We also show that this revaluation is not simply due to statistical artifact and that revaluation is more likely a product of the decision process itself, rather than a post-decisional process.