The human being has seven centers of psychological activity. The first five are the Intellectual, Emotional, Motor, Instinctive and Sexual Centers. However, through inner development one learns how to utilize the Superior Emotional and Superior Intellectual Centers. Most people do not use these two at all.
"Each one of these five centers penetrates the entire organism; nonetheless, if one Self-observes profoundly, one becomes aware that each one of the centers has a central, basic point situated at a specific area of our organic machine. The center of gravity of the intellect is found in the brain. The center of gravity of emotions is situated in the solar plexus. The center of gravity of movement is situated in the superior part of the dorsal spine. The center of gravity of instinct is found in the inferior part of the dorsal spine. The center of gravity of sex clearly has its roots in the sexual organs. Each one of the centers of the “machine” has absolutely defined specific functions." - Samael Aun Weor