" The impulse to be looking constantly with central vision is part of a psychophysical syndrome which includes spinal fixation as another characteristic. Tunnel vision -- the use of the macula, or central portion of the retina, to the relative exclusion of the surrounding area -- is hard on/eyes and diminishes their visual potential; it accentuates selective fixation upon objects one after another, missing the whole view and seeing objects as separate from their larger context. It accompanies and fortifies a tunneling habit of mind, a tendency to, fasten onto particular issues or circumstances, to hold doggedly and sometimes with exaggerated emotionality to a point of view, and to be unable to contextualize or to find fresh responses. "

― , Expressive Movement: Posture And Action In Daily Life, Sports, And The Performing Arts