Figure 4.
The structure of behavioural motifs for larval Drosophila. ESA identifies two motifs in the larva's behaviour; panel (a) shows a trajectory colour coded for the two motifs. Note that turning manoeuvres tend to happen when direction changes. Panel (b) shows a two-dimensional map of the distances among actions as measured by dynamic time warping (R2 = 0.85), see §2.9 for details. Panel (b) uses the same colour scheme as panel (a) to distinguish behaviours. The symmetry in the figure corresponds to the left/right symmetry in the animal's behaviour. Note that the points corresponding to the two behavioural motifs are concentrated in separate regions, yet there is no clear boundary between the two set of points. Panel (c) illustrates that similar ECTS subsequences can be found at every scale. These actions have been selected by starting in the middle of the map in (b) and picking example actions at regularly spaced distances along the x-axis, going from left to right.