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Early extrastriate activity without primary visual cortex in humans.

B Rossion1, B de Gelder, G Pourtois

  • 1Faculté de Psychologie, Unité de Neuropsychologie Cognitive (NECO), Université Catholique de Louvain, Louvain-la-Neuve, Belgium. rossion@neco.ucl.ac.be

Neuroscience Letters
|February 12, 2000
PubMed
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Even with primary visual cortex (V1) damage causing blindness, the extrastriate cortex shows visual responses. Event-related potentials reveal early neural activity in these areas for stationary stimuli.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cortical Plasticity

Background:

  • Primary visual cortex (V1) damage causes cortical blindness, eliminating major input to extrastriate areas.
  • Recent neuroimaging shows extrastriate activation for stimuli in the blind visual field, even without V1 activity.

Purpose of the Study:

  • To determine the timing of visual information processing in extrastriate areas following V1 damage.
  • To investigate extrastriate responses to visual stimuli in the absence of V1 input.

Main Methods:

  • Utilized event-related potentials (ERPs) to track neural responses.
  • Presented complex visual stimuli (faces) to the blind visual field of a hemianopic patient.

Main Results:

Related Experiment Videos

  • A positive occipital deflection (P1) response was observed for stimuli in the normal visual field at 140 ms.
  • A similar P1 response occurred for stimuli in the blind field, albeit delayed by 20 ms and reduced in amplitude.
  • The timing and topography of the P1 response indicate early extrastriate activity.

    • Conclusions:

    • Extrastriate cortical areas can process visual information even when V1 is denervated.
    • Early visual processing occurs in extrastriate regions, demonstrating functional adaptation or alternative pathways.
    • This finding challenges previous assumptions about the necessity of V1 for initial visual perception.