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Split Brains: Humans, Summary - Coggle Diagram
Split Brains: Humans
What Happened?
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Early studies found little effect of the operation following resolution of acute disconnection syndrome - these tend to stop rapidly, and patient seems normal.
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Was vision effected?
While patients fixed their gaze on a central point on a board, spots of light were flashed in a row across the board, spanning their visual field.
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When lights were flashed only on the left visual field, patients denied seeing any lights.
It might have been condluded that patients with divided brains, their right hemisphere was in effect, blind.
However, when asked to point where the lights were, they accurately pointed into the left visual field.
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Visual Fields
When a person is fixating centrally, information that is to the right of the fixation, is projected into the visual cortex of the left cerebral hemisphere.
Information that is to theleft of the fixation is projected to the visual cortex of the right cerebral hemisphere.
Stereognosis
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When the object was held in the right hand, the patient was able to name and describe it.
When the object was held in the left hand, the object could not be verbally identified, but could be nonverbally.
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Control
When outlines of the hand and fingers held in a variety of postures were flashed to the contralateral hemisphere, patients readily mimic the posture with the opposite hand, but fail with teh ipsilateral hand.
Unlike the sensory input, that is isolated to a hemisphere, motor output isn't quite as divided.
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