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From: Webster's Revised Unabridged Dictionary (1913)

 Psy·cho·phys·ic·al a. Of or pertaining to psychophysics; involving the action or mutual relations of the psychical and physical in man.
 Psychophysical time Physiol., the time required for the mind to transform a sensory impression into a motor impulse. It is an important part of physiological or reaction time. See under Reaction.
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