In a neurophysiological investigation, a monkey makes an involuntary gesture when a portion of its brain is electrically stimulated. The area of the brain that was most likely stimulated is the:
A) anterior portion of the parietal lobe
B) posterior portion of the frontal lobe
C) anterior portion of the frontal lobe
D) posterior portion of the occipital lobe

Question

Quizplus · Accepted Answer

The posterior portion of the frontal lobe, specifically the primary motor cortex, is responsible for voluntary movement. However, when this area is electrically stimulated, it can result in an involuntary gesture, as seen in the monkey's reaction. Other areas of the brain, such as the anterior portions of the frontal or parietal lobes, are not as heavily involved in motor control and are less likely to cause an involuntary gesture when stimulated. The occipital lobe is primarily involved in visual processing and would not be expected to elicit a motor response.

In a Neurophysiological Investigation, a Monkey Makes an Involuntary Gesture