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Updated: Sep 4, 2025

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Task-Dependent Warping of Semantic Representations during Search for Visual Action Categories.

Mo Shahdloo1,2,3, Emin Çelik2,4, Burcu A Urgen2,5,4

  • 1Wellcome Centre for Integrative Neuroimaging, Department of Experimental Psychology, University of Oxford, Oxford OX3 9DU, United Kingdom.

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Summary

Attention dynamically shifts brain

Keywords:
attentionfMRInatural moviesvisual actionsvoxelwise modeling

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Efficiently perceiving actions in dynamic scenes requires prioritizing targets over distractors.
  • Previous research suggests semantic representations are warped during object search.
  • The neural basis of semantic modulation during action search remains unclear.

Purpose of the Study:

  • To investigate whether and where visual search for action categories modulates semantic representations in the brain.
  • To explore the neural mechanisms underlying action perception in naturalistic settings.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to record brain activity.
  • Five subjects viewed natural movies while searching for communication or locomotion actions.
  • Analysis focused on attentional modulation of semantic representations across the neocortex.

Main Results:

  • Attention directed to action categories induced broad tuning shifts across the neocortex.
  • These shifts warped semantic representations and interacted with intrinsic cortical selectivity.
  • Evidence suggests tuning shifts are a general feature of conceptual representations.

Conclusions:

  • Attention dynamically warps semantic representations by inducing tuning shifts in cortical voxels.
  • This mechanism facilitates action perception by allocating neural resources to task-relevant categories.
  • Findings advance understanding of how the brain processes social interactions and intentions.