Figure 9
From: Methods for serial analysis of long time series in the study of biological rhythms
Serial analysis of the motor activity of a rat maintained under LD cycles with a period of 21 hours. The graph shows the simultaneous presence of the animal's own endogenous component (T2 = 1540) and the component entrained by the light (T1 = 1260). Sections are s = 1440 min and l = 7200 min. The analysis consisted in a linear model including simultaneously the two sinusoidal components (T1 and T2). In the graphs are represented: the total variance explained by the model (left), the variance explained by each component (3rd graph, black = T1, red = T2) and the percentage of variance explained by T2 with respect to the sum of two components (right).