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[Phosphenes elicited by subcortical stimulation in man]
1Department of Neurosurgery, University of Birmingham, West Midlands, U.K.
No Shinkei Geka. Neurological Surgery
|November 1, 1991
Summary
Electrical brain stimulation can create visual sensations called phosphenes. This study mapped phosphene locations, finding some results challenge traditional visual pathway anatomy.
Area of Science:
- Neuroscience
- Ophthalmology
- Visual Perception
Context:
- Electrical stimulation of the visual pathway can induce phosphenes, which are visual sensations.
- Previous research has explored phosphenes, but intracerebral stimulation offers unique insights.
- Understanding phosphene generation aids in mapping visual pathways.
Purpose:
- To investigate the characteristics and locations of phosphenes elicited by intracerebral stimulation.
- To compare phosphene perceptions (color, location) with stimulation sites in the visual pathway.
- To explore potential discrepancies between observed phosphene patterns and established visual cortex anatomy.
Summary:
- Intracerebral stimulation in 23 subjects produced 107 phosphenes, predominantly in the contralateral visual field.
- Stimulation in the medial occipital lobe (above calcarine fissure) yielded lower visual field phosphenes, while lateral stimulation yielded upper visual field phosphenes.
- Phosphenes were reported as white or colored, with findings potentially challenging traditional visual pathway mapping.
Impact:
- Provides new data on the somatotopic organization of the human visual pathway.
- Challenges conventional models of visual field representation in the brain.
- Informs future research on visual prosthetics and understanding visual processing disorders.