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Related Experiment Video

Updated: Sep 11, 2025

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

Published on: August 1, 2018

Opponent visuospatial coding structures responses during memory recall and visual perception in medial parietal

Catriona L Scrivener¹, Edward H Silson¹

¹Department of Psychology, School of Philosophy, Psychology and Language Sciences, University of Edinburgh, Edinburgh, United Kingdom.

Imaging Neuroscience (Cambridge, Mass.)

|August 13, 2025

Summary

This summary is machine-generated.

Brain regions involved in visual perception and memory use shared visuospatial coding. Opposing signals within these population receptive fields (pRFs) help integrate information during both recall and perception tasks.

Keywords:

medial parietal cortex perception recall visuospatial coding

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Last Updated: Sep 11, 2025

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Published on: January 22, 2018

Area of Science:

Neuroscience
Cognitive Neuroscience
Visual Perception

Background:

Mechanisms linking perception and memory representations remain unclear.
Early visual cortex shows shared neural representations for perception and memory.
Interaction beyond early visual cortex is less understood, though a shared visuospatial coding scheme exists in lateral and ventral brain areas.

Purpose of the Study:

To investigate visuospatial coding within medial parietal cortex memory areas.
To determine if this coding structures responses during memory recall and visual perception.
To explore the role of population receptive fields (pRFs) in integrating perceptual and memory information.

Main Methods:

Functional magnetic resonance imaging (fMRI) was employed.
Population receptive field (pRF) modeling was used to analyze neural responses.
Time-series analysis compared responses during memory recall and visual perception tasks.

Main Results:

Signatures of visuospatial coding, including positive and negative pRF profiles, were found in the medial parietal cortex.
Dissimilarity in pRF time-series correlated with dissimilar responses during memory recall and visual perception.
This pattern held true for both internally oriented memory recall and externally oriented visual perception.

Conclusions:

The medial parietal cortex exhibits visuospatial coding, evidenced by pRFs with opposing response profiles.
Interplay between pRFs with opponent coding is crucial for integrating information across representational spaces.
This coding framework supports the interaction between perceptual and memory systems in the brain.