I think Willy Bardas (On the Psychology of Piano Technique) makes a start when talking about 'imposed pedagogy':
'The only physiological factors which would here be relevant, and which
constitute the basis and point of departure for the development of skill,
are the fullest possible relaxation of the muscles, their slackness, elasticity,
and suppleness. It has been proven that in that state, their capacity for performance
is at its height. It is only that state that perfect innervation of movement is possible.'