Modern science and medicine are taking a new look at the causes of human behavior, and the link between certain physiological processes and human perception, a field in which Julien Offray de La Mettrie was a pioneer. The use of drugs in the treatment of mental illnesses such as schizophrenia and personality problems is based on the theory that these disorders result from a chemical or hormonal imbalance in the brain. Drugs are also used to treat more common thought-related behavioral problems such as hyperactivity and depression.
Studies are also being conducted on the physical activity in the brain during certain types of mental activity, and it has been demonstrated that certain areas of the brain become very active when a person is deeply engaged in meditation and prayer or reports a transcendental experience. There is also evidence that certain structures of the brain are associated with specific types of behavior, and a debate over whether the physical activity causes development in these areas of the brain, or the fact that these areas of the brain are already developed results in certain types of behavior.
Unificationism teaches that man has an invisible dimension—the spirit—which interacts with the physical body, and that this interaction nourishes, sustains and develops both the spirit and the body. The actions of the physical body provide elements for the spirit, and the spirit, which has the capacity to communicate with God, provides elements to the physical body. Since the physical human body is constructed to interact with the spirit, physiological and mental processes are naturally interconnected.