broadly defined psychology is the study of behaviour- specifically it"s an attempt to describe, explain and predict behaviour- and in some cases psych is also the study of how to change behaviour. Heart, m ind and brain: the early h istory of neuropsychology. The assumption that the brain plays a central role in behaviour is not particularly contentious today- but human thoughts and behaviours weren"t always attributed to the brain. empedocles was a philosopher who believed that the heart was the source of human behaviour- a position that became known as the cardiac or cardio centric hypothesis. aristotle came to the same conclusion, although for different reasons: concluded that the heart was the source of thought and sensation. brain does not cool blood, in fact blood helps to cool the brain, and the heart is not www. notesolution. com the source of human behaviour.