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Spatial Processing Enhancement in the Prefrontal Cortex for Rapid Detection of Valuable Objects.

Kiomars Sharifi1,2, Mojtaba Abbaszadeh2, Ali Ghazizadeh3,2

  • 1Bio-intelligence Research Unit, Sharif Brain Center, Electrical Engineering Department, Sharif University of Technology, Tehran 1458889694, Iran.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 21, 2025
PubMed
Summary

Valuable objects are found faster during visual search due to enhanced processing in the ventrolateral prefrontal cortex (vlPFC). This reward-driven mechanism improves detection of important peripheral items.

Keywords:
macaque monkeyprefrontal cortexreceptive fieldvalue-driven plasticityvisual search

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Objects with learned reward associations are efficiently located during visual search.
  • The underlying neural mechanisms for this valuable object pop-out effect remain largely unknown.

Purpose of the Study:

  • To investigate the neural basis of efficient visual search for high-value objects.
  • To determine the role of the ventrolateral prefrontal cortex (vlPFC) in reward-guided visual search.

Main Methods:

  • Neuronal responses were recorded in the vlPFC of macaques during visual search tasks.
  • Monkeys searched for high-value fractal objects (targets).
  • Behavioral data were analyzed using attention-modulated drift-diffusion models.

Main Results:

  • Efficient visual search correlated with enhanced processing of peripheral objects.
  • vlPFC neurons showed response amplification and receptive field widening for peripheral targets.
  • These neural changes predicted and correlated with improved target detection.

Conclusions:

  • Value-driven efficient visual search, independent of basic visual features, is supported by reward-induced spatial processing enhancements.
  • The vlPFC plays a critical role in integrating value information to guide attention and enhance perception of important peripheral objects.