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Related Experiment Videos

Shifting visual attention in space: an electrophysiological analysis using high spatial resolution mapping.

J M Hopf1, G R Mangun

  • 1Department of Neurology II, Otto-von-Guericke University, Leipziger Strasse 44, 39120, Magdeburg, Germany.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|July 6, 2000
PubMed
Summary

Investigating neural control of visual spatial attention reveals posterior-parietal and lateral-prefrontal cortices initiate top-down modulation of ventral extrastriate regions for enhanced sensory processing.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Visual spatial selective attention enhances early sensory processing in visual cortical areas.
  • Neural mechanisms controlling this attentional facilitation remain incompletely understood.

Purpose of the Study:

  • To investigate the neural control processes underlying visual spatial attention.
  • To identify the brain regions involved in directing and maintaining attention prior to target stimulus presentation.

Main Methods:

  • Event-related potentials (ERPs) were recorded from 92 scalp electrodes in 14 subjects.
  • Subjects covertly attended to cued locations (left or right visual field) before target stimuli were presented.
  • High spatial resolution analysis of ERPs examined brain activity evoked by attention-directing cues.

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Main Results:

  • An early component over occipital-parietal sites indicated posterior-parietal cortex involvement in attentional orienting.
  • A subsequent component over lateral-prefrontal cortex suggested voluntary attention control and maintenance.
  • A late component over occipital-temporal sites was linked to ventral extrastriate cortex activation.

Conclusions:

  • Voluntarily orienting visual attention spatially modulates cortical excitability.
  • This modulation is initiated by the posterior-parietal cortex.
  • The process is mediated by lateral-prefrontal cortical structures, impacting ventral extrastriate regions.