Drosophila: An Emergent Model for Delineating Interactions between the Circadian Clock and Drugs of Abuse

Figure 1

Measures of the circadian rhythm. (a) Cycles of peaks and troughs of activity occur at approximately 24-hour intervals. The period of the cycle is the time between successive peaks (or troughs) of activity whereas the extent of the increase or decrease in activity represents the amplitude of the cycle. (b) An early-night light pulse results in a phase delay. (c) A late-night light pulse results in a phase advance.

(a)

(b)

(c)