Figure 4
The organization of swimming behavior. Conditioned turning probabilities reveals a tendency to repeat turning in the same direction. Blue curve shows the total turning angle of bouts that directly follow a left turn >10 degrees and red curves the corresponding data for right turns. (B) Examples of how different types of bouts are preferentially performed in certain combinations and orders. Blue crosses denoted the actual probability of observing a given bout pair sequence and black dots represent the expected probability based on the overall frequency of observation of the two bout types making up the pair (constructed from 100 shuffled swimming sequences – note the clear separation between the observed randomized data for several of the pairs; The (X-X) sub-chain (top row) is the sum of probabilities for (1-1), (2-2), (3-3), etc.). (C) Swimming bouts of a given type tend to be concatenated into longer sequences of repetitive actions. The probability of observing one of the 15 types of swimming bouts is shown as a function of the number of previous observations of the same bout in a row. The theoretical probabilities of the corresponding memoryless system with the same bout class distributions as the actual data are plotted as a dashed line. Error bars represent SEM.
