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Target probability influences neural responses during visual search. Larger set sizes decreased target probability, leading to a larger P300 brainwave, indicating enhanced target processing.

Keywords:
EEGEye movementsFixation-related potentials (FRPs)P300Target probabilityVisual search

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Visual search tasks are crucial for understanding attention and decision-making.
  • Target probability, the likelihood of encountering a target, can modulate neural processing.
  • Previous research has explored factors influencing visual search, but the specific impact of target probability on neural correlates remains an active area of investigation.

Purpose of the Study:

  • To investigate how target probability affects the neural response during target detection in a free-viewing visual search task.
  • To examine the relationship between display set size, target probability, and electroencephalography (EEG) signals, specifically fixation-related potentials.
  • To differentiate the neural processing of targets versus distractors under varying probabilities.

Main Methods:

  • Participants performed a visual search task, identifying one or two targets among distractors.
  • Electroencephalography (EEG) and eye movements were simultaneously recorded.
  • Target probability was manipulated by varying display set sizes (10, 22, and 30 items).
  • Fixation-related potentials (ERPs) time-locked to the first target fixation were analyzed.

Main Results:

  • A pronounced P300 component was observed at the centro-parietal cortex, time-locked to target fixations.
  • P300 amplitudes were significantly larger for larger set sizes (22 and 30 items) compared to the smallest set size (10 items).
  • Increased set size led to more distractor fixations, reducing target probability and increasing P300 amplitude.
  • No significant increase in P300 amplitude was found for distractor fixations across set sizes.

Conclusions:

  • Set size in visual search directly impacts target processing, as evidenced by increased P300 amplitudes with larger displays.
  • The observed P300 modulation reflects the neural system's response to decreased target probability.
  • Neural processing of distractors is not similarly affected by set size, suggesting distinct mechanisms for target and distractor evaluation in overt serial visual search.