Testing multi-alternative decision models with non-stationary evidence
McClelland, J.L. and Usher, Marius and Tsetsos, K. (2011) Testing multi-alternative decision models with non-stationary evidence. Frontiers in Neuroscience 5 , ISSN 1662-4548.
Recent research has investigated the process of integrating perceptual evidence toward a decision, converging on a number of sequential sampling choice models, such as variants of race and diffusion models and the non-linear leaky competing accumulator (LCA) model. Here we study extensions of these models to multi-alternative choice, considering how well they can account for data from a psychophysical experiment in which the evidence supporting each of the alternatives changes dynamically during the trial, in a way that creates temporal correlations. We find that participants exhibit a tendency to choose an alternative whose evidence profile is temporally anti-correlated with (or dissimilar from) that of other alternatives. This advantage of the anti-correlated alternative is well accounted for in the LCA, and provides constraints that challenge several other models of multi-alternative choice.
|Keyword(s) / Subject(s):||multiple alternatives, diffusion, leaky integration, inhibition, perceptual decisions|
|School:||Birkbeck Schools and Departments > School of Science > Psychological Sciences|
|Date Deposited:||20 Apr 2012 09:59|
|Last Modified:||17 Apr 2013 12:33|
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