Abstract
1. 1. Fourier harmonic analysis has been applied to 20-min samples of . VCO 2, recorded every 12 sec over several (7–12) days, in one mouse, one rat, one guinea-pig, or one quail, maintained in controlled conditions of temperature, humidity and ventilation, and lit in LD12: 12 (100 lux). 2. 2. The harmonic computations, during L and D of ultradian periods (1.2 hr s $ ̌ τ S $ ̌ 12 hr) evidence statistically significant differences in amplitude and phase between these four small laboratory species. 3. 3. These periodic respiratory differences correspond to discrepancies in their diurnal and nocturnal activities, and in their responses to light and dark.
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