“Brokeback Mountain” director Ang Lee was keen on teaching Heath Ledger how “to capture stillness” – one of [Ledger’s character Ennis] Del Mar’s signature traits – which was hard for Ledger, who can get twitchy.
“Sometimes I find it hard sitting still, usually when I’m in the spotlight or even in rehearsal. My nervous energy comes streaking out of my fingerprints. My hands go all over the place.” [Los Angeles Times, March 5 2006]
Psychomotor Excitability is lots of physical energy and movement, fast talking, lots of gestures, sometimes nervous tics… Excitability is a higher than average capacity for experiencing internal and external stimuli, based on a higher than average responsiveness of the nervous system.
From description of the personality development theory of Kazimierz Dabrowski, MD, PhD. – see the page Dabrowski / advanced development.
Also see post: Intensity and Being Creative
A personality trait that may often accompany high sensitivity (experienced by many, or most, creative people) is high intensity. You can see some forms of intensity in many actors and musicians. Jodie Foster once commented about Russell Crowe, “He has that glacier intensity.”