Fig. 4
Analysis of chemotaxis parameters. The software extracts several parameters that describe the chemotaxis performance: (a) mean probability for a pirouette, (b) mean probability for a reversal, and (c) mean run lengths (time between reversals). All these parameters are dose dependent – mean probabilities for pirouettes and reversals increase with decreases is the concentration of the attractant. Conversely, mean run length time decreases. Error bars denote SEM of individual tracks. For the different concentrations of isoamyl-alcohol: 10–2, we averaged 447 tracks in total; 10–3, 1195 tracks in total; 10–4, 1470 tracks in total. d Probability for a pirouette increases the further the animal is located from the attractant, while the speed remains constant throughout the course of chemotaxis. Points are averages taken from 64 experiments comprising 7505 pirouette events and > 105 speed points