Behavioral modes were based on two parameters: mean turning angle and autocorrelation in speed and direction.
Using the V test, I determined that the measured turning angle data were unimodal with a mean turning angle of 180° (u = 8.67, p<0.0005) and the directional biases data were unimodal with a mean equal to 0° (u = 13.8, p<0.0005).
The general relationship between stimulus angle and mean head-turn angle, as exemplary described above (Figure 3), was highly similar for all stimulus conditions with intact ruff.
Informally, this means that turning angles between consecutive velocities have zero mean.
Additionally, it is important to note that while certain experimentally or virally induced neurodegenerative effects do modify swimming parameters in fish, such as the swimming distance and orientation, the mean velocity, the turning angle and the equilibrium [22] [24], this is not always the case.
Thus, the escape velocity was determined by the turn angle.
If the animal turned directly toward the stimulus, the turn angle would be exactly equal to the stimulus angle Φ.
This result suggests that the escape velocity was not constant but varied with the turn angle.
The parameters total distance traveled, mean and maximum velocity, turns, turn angles, angular velocity, meander, maximum duration on board and distance to wall were calculated from the videotrack data.
Moreover, similar search efficiencies can be reached by means of distinctly shaped turning angle distributions, provided that the resulting correlation length is the same.
