Abstract
Psychophysics, in this paper, is used in its literal sense: the effect of physical processes upon the mental processes of an organism. Recent studies show that temperature fluctuations of the human body have a 24-hour periodicity that is reflected in the activity of organs and functions of the body, awake and asleep. The rise and fall of such activity is phased differently for different Individuals. It may become necessary to determine the most receptive and responsive time for each individual to engage in communicating, as well as other significant activities.