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A retinotopic code structures the interaction between perception and memory systems.

Adam Steel1, Edward H Silson2, Brenda D Garcia3

  • 1Department of Psychology and Brain Sciences, Dartmouth College, Hanover, NH, USA. adamdanielsteel@gmail.com.

Nature Neuroscience
|January 3, 2024
PubMed
Summary
This summary is machine-generated.

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Retinotopic coding at the brain's apex structures interactions between memory and perception networks. This neural organization supports dynamic interplay between internally oriented recall and externally oriented perception.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Organization

Background:

  • Conventional models posit abstract, amodal coding at the cortical apex for internal information.
  • Recent findings indicate retinotopic coding, even in the default mode network, at the cortical apex.
  • The functional role of this apex retinotopic coding remains unclear.

Purpose of the Study:

  • To investigate the functional role of retinotopic coding at the cortical apex.
  • To determine how retinotopic coding influences interactions between mnemonic and perceptual brain systems.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • Analysis focused on category-selective memory and perceptual areas at the cortical apex and high-level visual cortex.

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Main Results:

  • Robust inverted (negative) retinotopic coding was observed in category-selective memory areas at the cortical apex.
  • This was functionally linked to positive retinotopic coding in category-selective perceptual areas.
  • These linked populations showed spatially specific opponent responses during both perception and recall, indicating mutual inhibition.

Conclusions:

  • Retinotopic coding at the cortical apex structures interactions between mnemonic and perceptual neural systems.
  • This organization provides a scaffold for the dynamic interplay between memory and perception.
  • The findings challenge conventional views of abstract amodal coding at the brain's highest levels.