FoundationalConceptsNeuroscience

Left visual field Right visual field

(LVF) (RVF)

Optic chiasm

ae Visual cortex

visual cortex = receiving information

receiving information from LVF

from RVF

Severed corpus callosum

Figure 18.3. In a split-brain patient the axons of the corpus callosum are sev-

ered, eliminating direct communication between the two hemispheres of the

cerebral cortex. Visual sensory information from the left or right visual field

goes only to the contralateral hemisphere and is not shared between the two

hemispheres.

In fact, he does know he saw a spoon. This can be demonstrated by
allowing the person to select from among several objects that he can
feel using his left hand. Tactile perception by and movement of the
left hand is under the control of the right hemisphere. Thus, visual
information that enters from the left visual field will be shared by the