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Spatiotemporal mapping of sex differences during attentional processing.

Andres H Neuhaus1, Carolin Opgen-Rhein, Carsten Urbanek

  • 1Department of Psychiatry and Psychotherapy, Charité University Medicine, Campus Benjamin Franklin, Berlin, Germany. andres.neuhaus@charite.de

Human Brain Mapping
|January 28, 2009
PubMed
Summary

Females show distinct brain activity patterns during visual attention tasks compared to males, particularly in the right prefrontal cortex. These electroencephalogram (EEG) findings reveal sex differences in neural processing related to stimulus salience.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Cognitive sex differences in visuospatial tasks are increasingly studied using functional neuroimaging.
  • Previous research suggests distinct neurocognitive strategies between females and males, with females often showing greater right prefrontal cortex activation.
  • The precise spatiotemporal dynamics of neural events underlying these sex differences remain unclear.

Purpose of the Study:

  • To investigate sex differences in neural substrates of cognitive processing during a visual selective attention task.
  • To explore the spatiotemporal dynamics of event-related potentials (ERPs) and their sources in relation to sex differences.
  • To examine the association between stimulus salience, ERPs, and prefrontal cortex activation in females and males.

Main Methods:

  • Electroencephalogram (EEG) with 29 channels was recorded from 22 female and 22 male participants during the Attention Network Test.
  • Visual event-related potentials (ERPs) were analyzed topographically, and neuroelectric sources were estimated.
  • Participants were matched for age, education, and nicotine use.

Main Results:

  • No behavioral differences were observed between sexes.
  • Females exhibited a significantly increased frontal-occipital second peak of the visual N100 component compared to males.
  • A novel central ERP component at ~220 ms, present only in females, correlated strongly with stimulus salience.
  • Source analysis indicated increased cortical current densities in the right rostral prefrontal cortex (BA 10) and occipital cortex (BA 19) in females.

Conclusions:

  • This study is the first to report a tripartite association between sex differences in ERPs, visual stimulus salience, and right prefrontal cortex activation during attentional processing.
  • Findings suggest distinct neural mechanisms underlying visual selective attention in females, involving enhanced right prefrontal and occipital activity.
  • The results contribute to understanding the neural basis of cognitive sex differences in attention and perception.