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      Unmet expectations delay sensory processes

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      Embargo Lift Date: 2022-01-02
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      Author(s)
      Ürgen, Buse Merve
      Boyacı, Hüseyin
      Date
      2021-01-02
      Source Title
      Vision Research
      Print ISSN
      0042-6989
      Electronic ISSN
      1878-5646
      Publisher
      Elsevier
      Volume
      181
      Pages
      1 - 9
      Language
      English
      Type
      Article
      Item Usage Stats
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      79
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      Abstract
      Expectations strongly affect and shape our perceptual decision-making processes. Specifically, valid expectations speed up perceptual decisions, and determine what we see in a noisy stimulus. Despite the well-established effects of expectations on decision-making, whether and how they affect low-level sensory processes remain elusive. To address this problem, we investigated the effect of expectation on temporal thresholds in an individuation task (detection of the position of an intact image, a house or face). We found that compared to a neutral baseline, thresholds increase when the intact images are of the unexpected category, but remain unchanged when they are of the expected category. Using a recursive Bayesian model with dynamic priors we show that delay in sensory processes is the result of further processing, consequently longer time, required in case of violated expectations. Expectations, however, do not alter internal parameters of the system. These results reveal that sensory processes are delayed when expectations are not met, and a simple parsimonious computational model can successfully explain this effect.
      Keywords
      Expectation
      Prediction
      Visual perception
      Perceptual inference
      Bayesian theorem
      Predictive processing
      Permalink
      http://hdl.handle.net/11693/77604
      Published Version (Please cite this version)
      https://doi.org/10.1016/j.visres.2020.12.004
      Collections
      • Aysel Sabuncu Brain Research Center (BAM) 228
      • Department of Psychology 216
      • National Magnetic Resonance Research Center (UMRAM) 250
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