Figure 4
From: Noninvasive fractal biomarker of clock neurotransmitter disturbance in humans with dementia
Effects of scheduled daily events on assessments of circadian rhythmicity and fractal patterns.
(A) Simulated 72-hour activity recording that possesses fractal correlations but no 24-h rhythm. (B) The same signal as shown in A except for an increased activity level between 9AM and 4PM that was used to simulate the environmental influence due scheduled daily events. (C) Fourier amplitudes of the signals shown in (A) and (B). (D) Detrended fluctuation function F(n) of the signals shown in (A) and (B). Daily events led to a significant 24-hour rhythm (C) but barely affected fractal patterns as revealed by detrended fluctuation analysis (D).
