Fig. 3.

Activity patterns of individual flies in the absence of external time cues. (a) Representative double-plotted actograms of individual flies typical of each genotype over two days of LD and seven days of DD. (b) Autocorrelograms of the activity of these same flies in DD after a low-pass filter has been applied. The height of the third peak detected in the circadian range is highlighted, as this is the value used to calculate the rhythmicity statistic (RS) and period. The RS and diurnal/nocturnal index (D/NI) is listed for each fly. (c) Pie charts representing the overall proportion of flies classified as rhythmic, weakly rhythmic or arrhythmic in DD for each genotype.