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Related Experiment Video

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Evidence for working memory storage operations in perceptual cortex.

Kartik K Sreenivasan1, Caterina Gratton, Jason Vytlacil

  • 1Helen Wills Neuroscience Institute, University of California, Berkeley, CA, USA, kartik.sreenivasan@nyu.edu.

Cognitive, Affective & Behavioral Neuroscience
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Summary
This summary is machine-generated.

Working memory (WM) storage occurs in perceptual cortex, not just executive regions. Face features held in visual cortex persist across new sensory input, showing WM

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Brain Research

Background:

  • Isolating working memory (WM) storage from executive functions is challenging.
  • Visual cortex activity patterns suggest WM representations exist.
  • The role of inter-regional communication in WM storage is unclear.

Purpose of the Study:

  • To determine if WM representations persist across intervening sensory input.
  • To investigate communication between association and perceptual cortex in WM.
  • To identify the neural basis of face feature storage in WM.

Main Methods:

  • fMRI and directed connectivity analysis.
  • Parametric manipulation of feature similarity between probe and target faces.
  • Participants performed a face matching task to probe WM representations.

Main Results:

  • Face-processing regions showed activity linearly scaling with feature similarity.
  • WM representations persisted across intervening sensory input.
  • Information flow from perceptual to prefrontal regions supported performance.

Conclusions:

  • Working memory storage operations are primarily executed within perceptual cortex.
  • Face features are stored in face-processing regions and persist during WM tasks.
  • WM involves a feedforward process comparing sensory input to stored perceptual representations.