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Area 17 lesions deactivate area MT in owl monkeys
1Department of Psychology, Vanderbilt University, Nashville, TN 37240.
Visual Neuroscience
|September 1, 1992
Summary
Area 17 connections significantly impact middle temporal area (MT) neuron responses. Ablating parts of area 17 selectively deactivated corresponding visual field representations in MT, with some plasticity observed.
Area of Science:
- Neuroscience
- Visual Cortex
- Primate Vision
Background:
- The middle temporal visual area (MT) is a key target of the primary visual cortex (area 17) in primates.
- Understanding the contribution of area 17 to MT neuron function is crucial for visual processing research.
Purpose of the Study:
- To assess how area 17 connections influence the responsiveness of MT neurons to visual stimuli.
- To investigate the role of area 17 in the visual field representation within area MT.
Main Methods:
- Electrophysiological mapping of the visual hemifield representation in the MT of anesthetized owl monkeys.
- Ablation of specific, electrophysiologically mapped portions of area 17.
- Immediate remapping of MT to observe the effects of the lesions.
Main Results:
- Neurons in MT responded vigorously to visual stimuli before lesions.
- Ablation of area 17 selectively deactivated the corresponding visuotopic map in MT.
- Some MT neurons near lesion margins showed slight receptive field shifts, indicating plasticity.
Conclusions:
- Area 17 connections are essential for maintaining normal responsiveness and visual field representation in area MT.
- The visual system exhibits some plasticity in response to deactivation of visual cortex inputs.