A Generative Statistical Algorithm for Automatic Detection of Complex Postures
(A) The fraction of coiling events that were detected within 5 sec of the initiation of directed locomotion. Loopy movers exhibit increased probabilities of anterior or posterior coiling upon initiating forward or backward locomotion, respectively. (B) Left: the probabilities of forward locomotion, reversals, and non-directional dwelling before and after a period of dwelling, after the onset of which anterior coiling was detected. Right: the probabilities of locomotion states before and after a period of dwelling, after the onset of which coiling was not detected. The horizontal time axis depicts the time leading to and immediately following a continuous period of dwelling, i.e., the entry into and exit from a dwelling event. The gaps signify that locomotion during the (variable) time of the coiling events themselves is not plotted. In all panels, 9–12 L4 larvae of each genotype were assayed for 2–4 hours. Error bars and thin lines depict animal-to-animal variation (mean ± s.e.m).