The Origin of Behavioral Bursts in Decision-Making Circuitry
Figure 2
Drosophila burstiness is mainly due to the IAI distribution, and not to memory effects.
(A) Burstiness parameter B for young (3 days, left) and adult (4 weeks, right) Canton-S (CS), yellow-white (yw) and w1118 flies, show bursty dynamics with B>0 (cf. Figure 1B), significantly different from the Poissonian B = 0 case with p<10−7. Older flies show a decrease of burstiness as compared to younger flies. (B) Burstiness of Drosophila IAIs has a small memory component. Significance levels are computed by comparison of actual and shuffled data (white bars). For the genetic background used in this study, w1118, there is no significant memory. Similar results are found for long-term memory, Figure S4. (C) Burstiness B and memory M are two different and independent burst-generating mechanisms, here represented in a plane and compared with data for human behavior dynamics, environmental phenomena and texts, taken from [8]. Drosophila dynamics fall in the same region as human dynamics, a region clearly separated from both environmental phenomena and texts. Figure S3 gives an overview of the total inter-activity intervals, shape and burstiness, as well as the corresponding values for total activity bout time, shape and burstiness. The same Drosophila data were used for Figures 1 and 2, number of flies n = 28–32. Error bars represent mean ± s.e.m.