When the mind affects the body, or the body affects the mind. How external events effect the internal mind and internal events affect the external body.
A blush, sexual arousal, physical pain, hypnosis.
"The sight of her raised my mentabolism!"
"Self-hypnotic mentabolism, removed the pain."
"Mentabolism, mind over matter, gave me the bodily control to win the game."
"Mentabolism, Pavlovian at work"