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Representation of visual numerosity information during working memory in humans: An fMRI decoding study.

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The parietal cortex, specifically the intraparietal sulcus, retains visual numerosity information during working memory delays. This brain region maintains number representations independently of ongoing perceptual input.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Cognitive Psychology

Background:

  • The parietal cortex is crucial for processing numerical information (numerosity) in both animals and humans.
  • Most research has focused on the perceptual aspects of numerosity, leaving the neural basis of its working memory representation unclear.
  • It remains unknown if numerosity is stored in the same brain regions as perception or if it undergoes abstract transformation, possibly involving prefrontal areas.

Purpose of the Study:

  • To investigate where numerosity-specific information is encoded during the working memory delay phase.
  • To determine if the brain regions involved in perceptual numerosity processing also maintain this information in working memory.
  • To differentiate working memory representations from perceptual activity using a retro-cue design.

Main Methods:

  • Employed functional magnetic resonance imaging (fMRI) with a searchlight-decoding approach to identify brain areas with content-specific activation patterns.
  • Utilized a retro-cue delayed match-to-sample task where participants (n=24) retained visual dot arrays varying in numerosity for 12 seconds.
  • Dissociated working memory delay activity from perceptual processes through the experimental design.

Main Results:

  • Identified significant mnemonic numerosity-specific activation within the right lateral intraparietal sulcus.
  • This area is a known hub for the perceptual processing of numerosity.
  • Demonstrated that the intraparietal sulcus maintains working memory representations of numerosity independently of concurrent perceptual input.

Conclusions:

  • The intraparietal sulcus plays a critical role not only in the perception of numerosity but also in its temporary storage within working memory.
  • Working memory for numerosity relies on the same neural substrate as its perceptual processing, suggesting a direct link between perception and memory maintenance.
  • Findings highlight the dynamic role of the intraparietal sulcus in representing numerical magnitude across different cognitive states.