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Spatial working memory in human extrastriate cortex.

Rebecca A Berman1, Carol L Colby

  • 1Department of Neuroscience, University of Pittsburgh, 15260, Pittsburgh, PA, USA.

Physiology & Behavior
|January 16, 2003
PubMed
Summary
This summary is machine-generated.

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Human extrastriate cortex, specifically the posterior superior temporal sulcus (PST) and lateral occipitotemporal cortex (LOT), is crucial for maintaining spatial working memory during eye movement tasks.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Spatial working memory involves higher-order association areas like the prefrontal and parietal cortex.
  • Previous monkey studies indicated memory-related activity in extrastriate cortex.

Purpose of the Study:

  • To investigate the role of human extrastriate cortex in the online maintenance of spatial information.
  • To determine if extrastriate areas contribute to spatial working memory during eye movement tasks.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to study brain activity.
  • Participants performed memory-guided saccades and visually guided saccades tasks.
  • Comparisons were made between task conditions and fixation baseline.

Related Experiment Videos

Main Results:

  • Significant activation was observed in the posterior superior temporal sulcus (PST) and lateral occipitotemporal cortex (LOT) during memory-guided saccades compared to visually guided saccades.
  • These areas (PST and LOT) were also active during visually guided saccades compared to fixation.
  • Lateral occipitotemporal cortex (LOT) was found to be anatomically distinct from the motion-sensitive area MT+.

Conclusions:

  • Human extrastriate cortex, including PST and LOT, plays a role in encoding and maintaining spatial representations.
  • These findings extend the known neural network for spatial working memory to include extrastriate visual areas.
  • The study highlights the contribution of visual processing areas to cognitive functions beyond basic perception.