August 2023
Volume 23, Issue 9
Open Access
Vision Sciences Society Annual Meeting Abstract  |   August 2023
A matter of availability: Sharper tuning for memorized than for perceived stimulus features.
Author Affiliations
  • Samson Chota
    Utrecht University
  • Surya Gayet
    Utrecht University
  • J. Leon Kenemans
    Utrecht University
  • Christian N.L. Olivers
    Vrije Universiteit Amsterdam
  • Stefan Van der Stigchel
    Utrecht University
Journal of Vision August 2023, Vol.23, 5213. doi:https://doi.org/10.1167/jov.23.9.5213
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      Samson Chota, Surya Gayet, J. Leon Kenemans, Christian N.L. Olivers, Stefan Van der Stigchel; A matter of availability: Sharper tuning for memorized than for perceived stimulus features.. Journal of Vision 2023;23(9):5213. https://doi.org/10.1167/jov.23.9.5213.

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

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Abstract

Our visual environment is relatively stable over time. An optimized visual system could capitalize on this by not devoting any representational resources to objects that are still physically present. The vividness of subjective experience, on the other hand, suggests that externally available (i.e., perceived) information is more strongly represented in neural signals than memorized information. To distinguish between these opposing predictions, we use EEG multivariate pattern analysis to quantify the representational strength of task-relevant features (color or spatial frequency) in anticipation of a change-detection task. Perceptual availability was manipulated between experimental blocks by either keeping the stimulus available on the screen during a two second delay period (perception) or removing it shortly after its initial presentation for the same time period (memory). We find that task-relevant (i.e., attended) memorized features are more strongly represented than irrelevant (i.e., unattended) features. More importantly, we find that task-relevant features evoke significantly weaker representations when they are perceptually available compared to when they are unavailable. These findings demonstrate that, contrary to what subjective experience suggests, vividly perceived stimuli elicit weaker neural representations (in terms of detectable multivariate information) than the same stimuli maintained in visual working memory. We hypothesize that an efficient visual system spends little of its limited resources on the internal representation of information that is externally available anyway.

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