Diurnal Variation in Mental Performance: A Study of Three-shift Workers

Abstract

A great deal of research has been done on the diurnal variations in different forms of animal and human activity. The first diurnal variation to be observed was the one in body temperature, and it is the one most widely recognized today. Similar diurnal variations have been observed in a series of other physical processes. Extensive surveys of the literature have been given by Holmgren (1936), Jores (1937), and Kleitman (1939, 1949). A series of investigations has also been carried out on diurnal variations in mental performance. At first these investigations were done by psycho-logists independently of physiological research. Freeman and Hovland (1934) gave an exhaustive review of the literature and assembled the contri-

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