Which idea states that the brain is the source of all behavior?

• A. Brain Hypothesis
• B. Ventricular Localization Hypothesis
• C. Rene Descartes
• D. Aphasia

Answer: (A)

The brain-based view holds that behavior arises from neural activity in the brain, so the brain is the source of all behavior. This Brain Hypothesis is supported by countless findings showing that brain damage changes how people act, think, and feel, and that different brain areas are linked to specific functions through lesions and neuroimaging. By contrast, the Ventricular Localization Hypothesis attributes mental faculties to the brain’s ventricles, which is an outdated idea and not supported by modern evidence. Descartes is a philosopher associated with mind-body dualism, not a theory asserting the brain as the sole source of behavior. Aphasia is a language impairment resulting from brain damage, not a theory about where behavior originates.