Thalamus and Hypothalamus Deep in the forebrain Vision, hearing, taste, and touch all pass through this small structure. Injury to the thalamus can cause deafness, blindness, or loss of any other sense, except smell. Size of a small grape. The master control center for emotion and basic motives. Affects behaviors as diverse as sex, rage, temperature control, hormone release, eating and drinking, sleep, waking, and emotion. Connects many areas of the brain. Also the final pathway for many kinds of behavior (it is the last place many behaviors are organized or “decided on” before messages leave the brain, causing the body to react.)