A soldier returning from combat is diagnosed with post-traumatic stress disorder (PTSD). Which brain structure is likely to show heightened activity when the soldier is exposed to combat-related stimuli?

The basal ganglia are primarily involved in the regulation of movement and coordination, as well as the processing of rewards and habits. While they play a role in emotional behavior, they are not specifically linked to the heightened responses seen in PTSD when exposed to trauma-related cues, making them less relevant in this context.

The cerebellum is primarily responsible for motor control, balance, and coordination. Although it contributes to some cognitive functions, it is not directly involved in emotional processing or the heightened fear response characteristic of PTSD. Thus, it does not show heightened activity in response to combat-related stimuli.

The corpus callosum is responsible for communication between the left and right hemispheres of the brain. While it plays a role in integrating cognitive and motor functions, it is not specifically involved in the emotional responses associated with PTSD. Therefore, it would not show heightened activity in response to combat-related stimuli.