August 2012
Volume 12, Issue 9
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2012
Sensory, perceptual and response biases: the criterion concept in perception
Author Affiliations
  • Mark Georgeson
    Aston University
Journal of Vision August 2012, Vol.12, 1392. doi:10.1167/12.9.1392
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Mark Georgeson; Sensory, perceptual and response biases: the criterion concept in perception. Journal of Vision 2012;12(9):1392. doi: 10.1167/12.9.1392.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

Signal detection theory (SDT) established in psychophysics a crucial distinction between sensitivity (or discriminability, d’) and bias (or criterion) in the analysis of performance in sensory judgement tasks. SDT itself is agnostic about the origins of the criterion, but there seems to be a broad consensus favouring ‘response bias’ or ‘decision bias’. And yet, perceptual biases exist and are readily induced. The motion aftereffect is undoubtedly perceptual - compelling motion is seen on a stationary pattern - but its signature in psychophysical data is a shift in the psychometric function, indistinguishable from ‘response bias’. How might we tell the difference? I shall discuss these issues in relation to some recent experiments and modelling of adaptation to blur (Elliott, Georgeson & Webster, 2011). A solution might lie in dropping any hard distinction between perceptual shifts and decision biases. Perceptual mechanisms make low-level decisions. Sensory, perceptual and response criteria might be represented neurally in similar ways at different levels of the visual hierarchy, by biasing signals that are set by the task and by the history of stimuli and responses (Treisman & Williams, 1984). The degree of spatial localization over which the bias occurs might reflect its level in the visual hierarchy. Thus, given enough data, the dilemma (are aftereffects perceptual or due to response bias?) might be resolved in favour of such a multi-level model.

Meeting abstract presented at VSS 2012

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×