" This statement was tremendously gratifying because it stated, from a physicist's perspective, what seemed to me the essential core of all my OCD work: that effort itself is the key to altering one's brain function. Stapp's insight was that quantum theory naturally allows for the direct influence of mental effort on the function of the brain. It thus makes mental effort and its effect on attention a primary causal agent. "

― Jeffrey M. Schwartz , The Mind and the Brain: Neuroplasticity and the Power of Mental Force