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Ensemble representations reveal distinct neural coding of visual working memory.

Abstract：

:We characterized the population-level neural coding of ensemble representations in visual working memory from human electroencephalography. Ensemble representations provide a unique opportunity to investigate structured representations of working memory because the visual system encodes high-order summary statistics as well as noisy sensory inputs in a hierarchical manner. Here, we consistently observe stable coding of simple features as well as the ensemble mean in frontocentral electrodes, which even correlated with behavioral indices of the ensemble across individuals. In occipitoparietal electrodes, however, we find that remembered features are dynamically coded over time, whereas neural coding of the ensemble mean is absent in the old/new judgment task. In contrast, both dynamic and stable coding are found in the continuous estimation task. Our findings suggest that the prefrontal cortex holds behaviorally relevant abstract representations while visual representations in posterior and visual areas are modulated by the task demands.

journal_name

Nat Commun

journal_title

Nature communications

authors

Oh BI,Kim YJ,Kang MS

doi

10.1038/s41467-019-13592-6

subject

Has Abstract

pub_date

2019-12-11 00:00:00

pages

5665

issue

1

issn

2041-1723

pii

10.1038/s41467-019-13592-6

journal_volume

10

pub_type

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