Psych Section Bank #83

[Mr. otcoD]

I thought that in a severed corpus callosum, there is no communication between the left and right hemispheres? How is it that when you look at something in your right visual field, you are still able to perceive it onto your left hemisphere?

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[rhinzaz]

A patient with a severed corpus callosum will show struggles of communication between left and right hemispheres of the brain during information processing. When that patient see's the word "ball" being projected to the right visual field, this sensory information travels to the opposite side of the brain (left hemisphere), where the information then gets processed. Luckily, the language processing centers (e.g Broca's area in the frontal cortex) are already on the left hemisphere, and therefore it doesn't need to crossover to the right hemisphere for processing. Likewise, the same patient seeing the word "room" projected on to his left visual field will receieve that sensory information on his right hemisphere, where it will then be unable to carry over and be processed on the left hemisphere; most likely resulting in the patient unable to say the words "room".

 

[Mr. otcoD]

A patient with a severed corpus callosum will show struggles of communication between left and right hemispheres of the brain during information processing. When that patient see's the word "ball" being projected to the right visual field, this sensory information travels to the opposite side of the brain (left hemisphere), where the information then gets processed. Luckily, the language processing centers (e.g Broca's area in the frontal cortex) are already on the left hemisphere, and therefore it doesn't need to crossover to the right hemisphere for processing. Likewise, the same patient seeing the word "room" projected on to his left visual field will receieve that sensory information on his right hemisphere, where it will then be unable to carry over and be processed on the left hemisphere; most likely resulting in the patient unable to say the words "room".

So the sensory information is still able to cross the hemispheres? Or is it where the right visual field is directly connected to the left hemisphere and vice versa?

 

[aldol16]

Crossing over of the visual fields occurs at the level of optic chiasm and that occurs independently of the corpus callosum.