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    Vision for the blind: visual psychophysics and blinded inference for decision models

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    Author
    Smith, PL; Lilburn, SD
    Date
    2020-06-08
    Source Title
    Psychonomic Bulletin and Review
    Publisher
    SPRINGER
    University of Melbourne Author/s
    Smith, Philip; Lilburn, Simon
    Affiliation
    Melbourne School of Psychological Sciences
    Metadata
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    Document Type
    Journal Article
    Citations
    Smith, P. L. & Lilburn, S. D. (2020). Vision for the blind: visual psychophysics and blinded inference for decision models. PSYCHONOMIC BULLETIN & REVIEW, 27 (5), pp.882-910. https://doi.org/10.3758/s13423-020-01742-7.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/251490
    DOI
    10.3758/s13423-020-01742-7
    Abstract
    Evidence accumulation models like the diffusion model are increasingly used by researchers to identify the contributions of sensory and decisional factors to the speed and accuracy of decision-making. Drift rates, decision criteria, and nondecision times estimated from such models provide meaningful estimates of the quality of evidence in the stimulus, the bias and caution in the decision process, and the duration of nondecision processes. Recently, Dutilh et al. (Psychonomic Bulletin & Review 26, 1051-1069, 2019) carried out a large-scale, blinded validation study of decision models using the random dot motion (RDM) task. They found that the parameters of the diffusion model were generally well recovered, but there was a pervasive failure of selective influence, such that manipulations of evidence quality, decision bias, and caution also affected estimated nondecision times. This failure casts doubt on the psychometric validity of such estimates. Here we argue that the RDM task has unusual perceptual characteristics that may be better described by a model in which drift and diffusion rates increase over time rather than turn on abruptly. We reanalyze the Dutilh et al. data using models with abrupt and continuous-onset drift and diffusion rates and find that the continuous-onset model provides a better overall fit and more meaningful parameter estimates, which accord with the known psychophysical properties of the RDM task. We argue that further selective influence studies that fail to take into account the visual properties of the evidence entering the decision process are likely to be unproductive.

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