Lecture, three hours; discussion, two hours. Course 73A is enforced requisite to 73B, which is enforced requisite to 73CW. Limited to first-year freshmen. Human brain is most complex structure in universe and last major organ system to be understood. Our brains give us power to see and hear, learn and remember, interpret others, and act purposefully in our environment. We can lose these abilities that we take for granted, naturally over time or as result of injury or disease. Brain function from historical, biological, psychological, and philosophical perspectives to enable students to better understand organ responsible for all mental processes and behavior in health and disease and to encourage them to think and write critically about interaction of neurobiological, philosophical, and psychological factors that control behavior and our experiences as human beings. Use of historical perspective to better understand how field of neuroscience and study of brain have emerged over time. Letter grading.