Dr. jacobs is electrically stimulating parts of a cat's brain. a cat that becomes enraged 3/4 pupils dilated, claws out, hissing 3/4 has most likely been stimulated in the:

Answer is: limbic system.
Limbic system (paleomammalian cortex) is part of brain structures located on both sides of the thalamus. In limbic systems are: olfactory bulbs, limbic and midbrain area, hippocampus, hypothalamus, septum pellucidum, amygdala, anterior thalamic nuclei, fornix, columns of fornix, mammillary body, habenulam, commissure, cingulate gyrus, parahippocampal gyrus and entorhinal cortex.