Final answer:
Studies on people with a severed corpus callosum, which causes a split-brain condition, are referred to as split-brain research.
Step-by-step explanation:
Studies investigating behavioral and cognitive changes in people with a severed corpus callosum are referred to as split brain research. The corpus callosum is a bundle of neural fibers that connects the two cerebral hemispheres, allowing for communication between them. When it's cut to treat conditions like severe epilepsy, the result is a split-brain condition. This can lead to unique insights into the functions of the left and right hemispheres. For instance, split brain patients may be able to pick up an object with their left hand (controlled by the right hemisphere) without being able to verbally identify it, due to the speech center's general location in the left hemisphere.