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Related Experiment Videos

Object-based facilitation and inhibition from visual orienting in the human split-brain

S P Tipper1, R Rafal, P A Reuter-Lorenz

  • 1Centre for Perception and Motor Sciences, School of Psychology, University of Wales, Bangor, Gwynedd, United Kingdom. pss060@bangor.ac.uk

Journal of Experimental Psychology. Human Perception and Performance
|October 23, 1997
PubMed
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Object-based attention shows inhibition when moving within a visual field but facilitation when crossing hemispheres in split-brain patients. This highlights distinct neural pathways for attention.

Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Psychology

Background:

  • Object-based attention allows focusing on specific items, even when they move.
  • Split-brain patients, with severed corpus callosum, offer insights into interhemispheric communication.
  • Normal attention exhibits inhibition for cued objects, regardless of movement within or between visual fields.

Purpose of the Study:

  • To investigate object-based attention mechanisms in split-brain patients.
  • To determine how interhemispheric transfer affects attentional inhibition and facilitation.
  • To explore the role of the corpus callosum in object-based attention.

Main Methods:

  • Examining object-based attention in two split-brain patients.
  • Presenting precued objects that moved within a visual field or crossed the midline.

Related Experiment Videos

  • Measuring signal detection performance for cued objects.

    • Main Results:

    • Split-brain patients exhibited normal inhibition when the cued object stayed within one visual field.
    • When the cued object crossed the midline, patients showed faster detection in the cued area.
    • These findings suggest both inhibitory and facilitatory object-based attention effects.

    Conclusions:

    • Object-based attention involves both inhibitory and facilitatory processes lasting milliseconds.
    • Inhibitory effects on attention require the corpus callosum for interhemispheric transfer.
    • Facilitatory effects can be transferred subcortically, independent of the corpus callosum.