On Mental Energy.
D001143:Arousal; D001519:Behavior; D001527:Behaviorism; D001921:Brain / Q000502:physiology; D004594:Electrophysiology; D005010:Ethology; D006801:Humans; D007323:Instinct; D008606:Mental Processes; D008678:Metaphysics; D009042:Motivation; D011574:Psychoanalytic Theory; D011601:Psychophysics; D012154:Reticular Formation / Q000502:physiology