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  • 1Center for Cognitive Neuroscience, Duke University, Durham, NC 27708, United States.

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This study reveals how brain activity changes during visual search tasks. Improved attention and faster brain responses correlate with quicker performance, showing optimized strategies with practice.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Performance on cognitive tasks varies significantly.
  • Understanding the neural basis of this variability is crucial for cognitive science.

Purpose of the Study:

  • Investigate the neural mechanisms behind performance variability in visual search.
  • Examine trial-by-trial relationships between response times and electroencephalography (EEG) signals.

Main Methods:

  • Utilized regression-based analyses on EEG data from 13 participants over five days of training on a visual search task.
  • Recorded EEG on days one and five, focusing on prestimulus, early poststimulus, and sustained neural activity.

Main Results:

  • Faster response times (RTs) correlated with better preparatory attention (less Alpha activity) and enhanced early visual responses (larger N1 waves).
  • N1 amplitudes decreased within sessions, indicating strategy optimization.
  • Faster RTs were associated with earlier and larger lateralized N2pc waves (attentional orienting) and smaller SPCN waves (orientation discrimination) after practice.

Conclusions:

  • Visual search processes exhibit session-dependent variations.
  • Cortical mechanisms, including attentional orienting and sensory processing, underlie performance optimization with practice in visual search.