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Interhemispheric visual competition after multisensory reversal of hemianopia
Alexander S Dakos1, Ellen M Walker1, Huai Jiang1
1Department of Neurobiology and Anatomy, Wake Forest University School of Medicine, Winston-Salem, NC, USA.
The European Journal of Neuroscience
|August 21, 2019
Summary
Multisensory training restored vision in cats with brain damage, surprisingly overcoming deficits in previously blind visual fields. This suggests greater visual processing potential than expected after visual cortex loss.
Area of Science:
- Neuroscience
- Vision Science
- Rehabilitation Medicine
Background:
- Unilateral visual cortex lesions cause hemianopia by suppressing superior colliculus (SC) visual circuits.
- Multisensory training can reinstate SC visual responses and vision in the blind hemifield.
Purpose of the Study:
- To evaluate visual processing in previously blind hemifields after multisensory rehabilitation, especially when competing with the normal hemifield.
- To determine if visual cortex loss permanently impairs visual function despite training.
Main Methods:
- Utilized a visual choice paradigm with simultaneous visual targets in both hemifields of recovered cats.
- Assessed stimulus preference, awareness, and multisensory enhancement across varying stimulus intensities.
Main Results:
- Cats did not show expected performance disparities and sometimes preferred stimuli in the previously blind hemifield.
- Awareness and multisensory enhancement were comparable between the previously blind and normal hemifields.
- Visual preference persisted across stimulus intensity levels.
Conclusions:
- Multisensory rehabilitation revealed unexpected visual information processing potential in the previously blind hemifield.
- The findings challenge the assumption of permanent visual deficits following visual cortex lesions after successful rehabilitation.
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