Physiological psychology is the study of physiological basis of how we think, connecting the physical operation in the brain with that which you actually say as well as do. It is thus worried about brain cells, head structures and components, brain chemistry, and how all of this leads to presentation and action. Physiological psychology is usually a subdivision of behavioral neuroscience that studies the neural components of perception as well as behavior through direct manipulation in the brains of nonhuman pet subjects in manipulated experiments.