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Psychology >> Psychological Terms >> Corpus Callosum

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Corpus Callosum

Corpus callosum is the largest of the commissures linking the left and right cerebral hemispheres.

If the corpus callosum is cut (split-brain patients), the information in the right hemisphere cannot be transferred to the left hemisphere.

The right hemisphere is very deficient in language (essentially unable, typically, to control speech) so it will not be able to name the object.
The right hemisphere controls the left hand though so the left hand will be able to pick out or draw the object.

E.g., if you show a split-brain patient a picture of a sphere in the patient's left field of view, the patient will not be able to say that s/he saw a sphere.

The patient may be able to, however, draw the sphere with his/her left hand or may be able to pick the sphere out of an array of pictures, again pointing with the left hand.

This tells you that, because of contralateral projection, the left visual field is projected to the right hemisphere.