A split-brain patient who sees something in one visual field and later can point to it with the left hand must:
A) have seen it in the right visual field.
B) have seen it in the left visual field.
C) be able to say what it was.
D) be able to point to it with the right hand, also.

Question

Quizplus · Accepted Answer

The left hand is controlled by the right hemisphere of the brain, so if the patient is able to point to the object with the left hand, it must have been presented in the right visual field, which is processed by the left hemisphere of the brain. Choice A is incorrect because seeing something in the right visual field would result in pointing with the right hand, which is controlled by the left hemisphere. Choice C is irrelevant, as the question only pertains to manual pointing ability. Choice D is also incorrect because the patient is only able to point to the object with the left hand.

A Split-Brain Patient Who Sees Something in One Visual Field