Final answer:
Split-brain patients lack interhemispheric transfer due to the cutting of the corpus callosum, resulting in a separation of functions between the two hemispheres.
Step-by-step explanation:
Split-brain patients have a lack of interhemispheric transfer. This occurs because the corpus callosum, which connects the two hemispheres of the brain, is cut. Without the corpus callosum, information cannot be shared between the two hemispheres, leading to a separation of functions.
For example, if an object is presented to a split-brain patient's left visual field, they may be unable to verbally name the object. This is because the visual input from the left visual field crosses and enters the right hemisphere, which is unable to signal to the speech center typically found in the left side of the brain. However, if the patient is asked to pick up a specific object with their left hand, which is controlled by the right hemisphere, they will be able to do so, but still unable to verbally identify it.