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Related Experiment Videos

Motion opponency in visual cortex.

D J Heeger1, G M Boynton, J B Demb

  • 1Department of Psychology, Stanford University, Stanford, California 94305-2130, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|August 6, 1999
PubMed
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Visual motion perception relies on opponent mechanisms. This study found strong motion opponency in the human MT complex (MT+) using fMRI, comparable to findings in macaque monkeys.

Area of Science:

  • Neuroscience
  • Visual Perception

Background:

  • Visual motion perception is thought to involve opponent mechanisms with neurons sensitive to opposite directions.
  • These mechanisms involve mutually suppressive neuronal populations.

Purpose of the Study:

  • To investigate the neuronal basis of motion opponency in the human visual cortex.
  • To compare motion opponency in humans and macaque monkeys.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity in humans.
  • Multiunit electrophysiological recording was performed in macaque monkeys (areas MT and MST).

Main Results:

  • Strong motion opponency was observed in the human MT complex (MT+), but not in primary visual cortex.

Related Experiment Videos

  • Human and macaque monkey data showed qualitatively similar average motion opponency.
  • Variability in opponency was noted between recording sites in monkeys.

    • Conclusions:

    • Human MT+ responses are underpinned by direction-selective signals.
    • Neuronal signals in human MT+ support visual motion perception.
    • Human MT+ is homologous to macaque MT and adjacent motion-sensitive areas.
    • fMRI measurements correlate with average neuronal spiking activity.