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• W2323861413 abstract "Event Abstract Back to Event Evidence of constant choice thresholds in drift-diffusion modeling of an expanded judgment task Ian Krajbich1, 2*, Nils Madsen2 and Antonio Rangel2 1 University of Zurich, Department of Economics, Switzerland 2 Caltech, Division of the Humanities and Social Sciences, United States Lately there has been much interest in drift-diffusion models and other related rise-to-threshold models for describing decision making. However, one critical issue that remains open is whether indeed the choice threshold is constant, whether it decreases over time (equivalent to an urgency signal) in order to terminate hard decisions prematurely, or whether it seemingly increases over time due to signal leakage. To investigate this issue, we conducted an experiment where human subjects view a sequence of stochastically drawn numbers and must decide, when they are confident enough, whether the numbers are coming from a truncated normal distribution with mean +1 or mean -1. Subjects are paid per correct choice but they also have a time limit and any trials that they don't complete are marked as incorrect. Unlike other experiments with unknown and/or binary evidence streams, this task allows us to measure the strength of each piece of evidence and to determine how subjects weight each sample in their final decision. We find that subjects behave as if they are using a constant choice threshold and we find no evidence of collapsing barriers (or an urgency signal) even for long decisions. However, we do find some evidence that subjects may be weighting their latest sample more than the previous ones when deciding whether to stop or collect more evidence. Keywords: Decision Theory, decision-making, Psychophysics Conference: Neural Coding, Decision-Making & Integration in Time, Rauischholzhausen, Germany, 26 Apr - 29 Apr, 2012. Presentation Type: Poster Presentation Topic: Neural Coding, Decision-Making & Integration in Time Citation: Krajbich I, Madsen N and Rangel A (2012). Evidence of constant choice thresholds in drift-diffusion modeling of an expanded judgment task. Front. Neurosci. Conference Abstract: Neural Coding, Decision-Making & Integration in Time. doi: 10.3389/conf.fnins.2012.86.00007 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 12 Jan 2012; Published Online: 16 Jan 2012. * Correspondence: Dr. Ian Krajbich, University of Zurich, Department of Economics, Zurich, Switzerland, krajbich@gmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Ian Krajbich Nils Madsen Antonio Rangel Google Ian Krajbich Nils Madsen Antonio Rangel Google Scholar Ian Krajbich Nils Madsen Antonio Rangel PubMed Ian Krajbich Nils Madsen Antonio Rangel Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page." @default.
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• W2323861413 date "2012-01-01" @default.
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• W2323861413 title "Evidence of constant choice thresholds in drift-diffusion modeling of an expanded judgment task" @default.
• W2323861413 doi "https://doi.org/10.3389/conf.fnins.2012.86.00007" @default.
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