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Related Experiment Videos

Subcortical gating in the human visual system during spatial selective attention.

M T Oakley1, R G Eason

  • 1Los Alamos National Laboratory, NM 87545.

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|September 1, 1990
PubMed
Summary

Spatial selective attention influences early brain responses, suggesting precortical gating mechanisms. Later neural activity also shows modulation, potentially involving glial cells.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • The role of subcortical gating in spatial selective attention is not fully understood.
  • Previous research has explored attentional modulation of sensory processing.

Purpose of the Study:

  • To investigate whether subcortical gating is influenced by spatial selective attention.
  • To examine the effects of attending to a specific visual field on neural responses.

Main Methods:

  • Utilized a spatial selective attention paradigm (Eason et al., 1969).
  • Monitored visual evoked responses (VERs) in subjects instructed to attend to one visual field and ignore stimuli in the other.

Main Results:

  • VERs within 40-70 ms were significantly more negative when the stimulus location was attended.

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  • Later VER deflections (100-200 ms) showed enhanced amplitude and negative bias.
  • Early effects support spatial attention-induced precortical gating.

    • Conclusions:

    • Spatial attention modulates early visual processing, indicating precortical gating.
    • Later neural effects suggest amplitude enhancement of exogenous components and possible glial cell involvement in slow wave negativity.