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Related Experiment Videos

Microstimulation in visual area MT: effects on direction discrimination performance.

C D Salzman1, C M Murasugi, K H Britten

  • 1Department of Neurobiology, Stanford University School of Medicine, California 94305.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 1, 1992
PubMed
Summary

Electrical stimulation of direction selective neurons in the visual cortex directly influences perception of motion direction. This study confirms a causal link between neural activity and visual perception.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Direction selective neurons in the visual cortex are thought to be crucial for perceiving motion.
  • Previous research suggested a correlation between these neurons' activity and motion perception.

Purpose of the Study:

  • To experimentally test the hypothesis that direction selective neurons' activity causally underlies motion direction perception.
  • To investigate the direct impact of enhancing neural activity on perceptual judgments.

Main Methods:

  • Rhesus monkeys performed a motion direction discrimination task with near-threshold visual stimuli.
  • Cortical microstimulation was applied to direction selective neurons while monkeys viewed the display.
  • Performance on stimulated and non-stimulated trials was compared to assess the effect of microstimulation.

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Main Results:

  • Microstimulation significantly affected perceptual judgments in 89 out of 139 experiments.
  • In 97% of significant cases, stimulation biased choices towards the neurons' preferred motion direction.
  • This demonstrates a direct functional relationship between neural activity and perceptual decisions.

Conclusions:

  • The findings provide strong evidence for a causal role of direction selective neurons in the visual cortex for motion perception.
  • Enhancing the activity of specific neuronal populations can predictably alter subjective perceptual experience.
  • This study establishes a direct link between neuronal firing rates and behavioral choices in motion discrimination.