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.
These split-brain results provide direct evidence for what concept?
- A
Equipotentiality of cortical regions
- B
The all-or-none law of neural firing
- Ccheck_circle
Hemispheric lateralization of function
- D
Neural plasticity in adulthood
Explanation
Split-brain studies demonstrate that the two hemispheres specialize for different functions (lateralization), with language typically in the left hemisphere. Plasticity refers to reorganization, and the all-or-none law describes neural firing thresholds.