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The representational dynamics of sequential perceptual averaging

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Title
The representational dynamics of sequential perceptual averaging
Author(s)
Jongrok Do; Kang Yong Eo; Oliver James; Joonyeol Lee; Yee-Joon Kim
Publication Date
2022-02
Journal
Journal of Neuroscience, v.42, no.6, pp.1141 - 1153
Publisher
Society for Neuroscience
Abstract
It is clear that humans can extract statistical information from streams of visual input, yet how our brain processes sequential images into the abstract representation of the mean feature value remains poorly explored. Using multivariate pattern analyses of electroencephalgraphy recorded while human observers viewed the sequentially presented ten Gabors of different orientations to estimate their mean orientation at the end, we investigated sequential averaging mechanism by tracking the quality of individual and mean orientation as a function of sequential position. Critically, we varied the sequential variance of Gabor orientations to understand the neural basis of perceptual mean errors occurring during sequential averaging task. We found that the mean-orientation representation emerged at specific delays from each sequential stimulus onset and became increasingly accurate as additional Gabors were viewed. Especially in frontocentral electrodes, the neural representation of mean orientation improved more rapidly and to a greater degree in less volatile environment while individual orientation information was encoded precisely regardless of environmental volatility. The computational analysis of behavioral data also showed that perceptual mean errors arise from the cumulative construction of the mean orientation rather than the low-level encoding of individual stimulus orientation. Thus, our findings provide neural mechanisms to differentially accumulate increasingly abstract feature from a concrete piece of information across the cortical hierarchy depending on 49 environmental volatility.
URI
https://pr.ibs.re.kr/handle/8788114/11741
DOI
10.1523/JNEUROSCI.0628-21.2021
ISSN
0270-6474
Appears in Collections:
Center for Cognition and Sociality(인지 및 사회성 연구단) > 1. Journal Papers (저널논문)
Center for Neuroscience Imaging Research (뇌과학 이미징 연구단) > 1. Journal Papers (저널논문)
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