In a series of studies, Roger Sperry and Michael Gazzaniga tested patients whose corpus callosum had been severed to relieve severe epilepsy. Researchers flashed an image of a spoon to the patient's left visual field while the patient stared at a central dot. When asked what they saw, patients verbally reported "nothing." However, when asked to use the left hand to select an object hidden behind a screen, patients correctly chose the spoon.
The corpus callosum's normal function is best described as:
- A
Filtering sensory input on its way to the cortex
- B
Coordinating fine motor movements
- Ccheck_circle
Transferring information between the two cerebral hemispheres
- D
Producing dopamine for the basal ganglia
Explanation
The corpus callosum is a thick band of axons that connects and transmits information between the left and right hemispheres. The cerebellum coordinates movement, the substantia nigra produces dopamine, and the thalamus filters sensory information.