1. Phase angle difference before and after a phase jump of the Zeitgeber oscillation showed greater differences in temperature cycles with small amplitude (Fig.

2. On this assumption, deviations of the Zeitgeber-frequency from the intrinsic frequency of the dependent systems cause phase-angle differences between the two systems.

3. The Biopsychology topic examines: the nervous system; endocrine system, fight-or-flight; localisation of function; plasticity and functional recovery; ways of studying the brain; biological rhythms and endogenous pacemakers and exogenous zeitgebers.