In cockroaches the main role in the adjustment of circadian rhythms is attributed to the compound eyes; at the same time, morphological data indicate a possible role of ocelli in the modulation of the biological clock. Data obtained in this study reveal the effect of shielding the ocelli with black dye on the speed of the rhythm shift and its amplitude. In addition, it is shown that sexual behavior, locomotor activity, shelter occupation, and sleep-like behavior expressed as freezings, have a pronounced rhythm with a single peak, and resting periods have two pronounced minima at the beginning and at the end of the dark phase. Light intensity during the day phase affects the amplitude of behavioral rhythms in a manner similar to ocelli shielding.
E. S. Novikova (Wed,) studied this question.