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Related Experiment Videos

Selective attention effects on somatosensory evoked potentials.

A C Papanicolaou1, B D Moore, H E Gary

  • 1Division of Neurosurgery, University of Texas, Medical Branch, Galveston 77550.

The International Journal of Neuroscience
|April 1, 1989
PubMed
Summary

Selective attention to sensory stimuli is a late cortical process. Focusing attention on one hand’s touch enhances long-latency somatosensory evoked potentials (SEPs) from that hand, not early responses.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Somatosensory System

Background:

  • Selective attention modulates sensory processing.
  • Understanding the timing and location of attentional effects is crucial.

Purpose of the Study:

  • To investigate the temporal dynamics of selective attention in the somatosensory system.
  • To determine whether attention affects early or late somatosensory evoked potentials (SEPs).

Main Methods:

  • Recorded short and long latency SEPs from median nerve stimulation.
  • Compared SEPs during control, attended-to-same-hand, and attended-to-opposite-hand conditions.
  • Monitored responses at Erb's point and contralateral hemisphere.

Main Results:

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  • Long-latency SEPs showed significantly greater amplitude when attention was directed to the stimulated hand.
  • No significant differences were observed in Erb's point responses or short-latency SEPs.
  • Attentional effects were specific to later cortical processing stages.

Conclusions:

  • Selective attention to peripheral somatosensory stimulation is a late process.
  • Attention is mediated by cortical mechanisms, not early subcortical or peripheral suppression.
  • These findings challenge models of early attentional gating in sensory pathways.