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Related Experiment Video

Updated: Mar 22, 2026

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The effect of modulating top-down attention deployment on the N2pc/PCN.

Qiang Liu1, Shuyu Lin2, Guang Zhao1

  • 1Research Center of Brain and Cognitive Neuroscience, Liaoning Normal University, Dalian 116029, China.

Biological Psychology
|April 16, 2016
PubMed
Summary

The N2pc/PCN component

Keywords:
ERPN2pc/PCNSpatial attentionStrategyVisual search

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Area of Science:

  • Cognitive Neuroscience
  • Visual Attention Research
  • Event-Related Potential (ERP) Studies

Background:

  • The N2pc/PCN component of event-related potentials (ERPs) is used to study spatial attention during visual search.
  • It remains unclear if N2pc/PCN amplitude reflects attentional resource deployment.
  • Previous research lacks evidence on top-down attention influencing N2pc/PCN amplitude.

Purpose of the Study:

  • To investigate the relationship between N2pc/PCN amplitude and top-down attention allocation.
  • To manipulate discriminative difficulty while keeping search difficulty constant.
  • To determine if attentional deployment modulates N2pc/PCN amplitude.

Main Methods:

  • Participants performed visual search tasks with varying discriminative difficulty.
  • Stimuli were presented in blocked and randomly interleaved mixed sets.
  • Event-related potentials (ERPs), specifically the N2pc/PCN component, were recorded.
  • Behavioral data (reaction times) were collected.

Main Results:

  • N2pc/PCN amplitude was higher in the hardest discrimination condition compared to easier ones in the blocked set.
  • No significant difference in N2pc/PCN amplitude was observed for the same stimuli in the mixed set.
  • Behaviorally, participants were slower in the hardest discrimination condition under both set types.

Conclusions:

  • The N2pc/PCN component's amplitude is modulated by the predictability of discriminative difficulty.
  • This modulation reflects changes in top-down attentional deployment.
  • The findings support the role of N2pc/PCN in reflecting attentional resource allocation during visual search.