Table 1. Brief description of the twelve parameters calculated from the trajectory of the flies used in this paper.

A more detailed description is available at http://dx.doi.org/10.6084/m9.figshare.844624.

Parameter	Description
Median speed	Median of the speed of the animal while walking
Mean distance travelled per min.	Distance travelled during the experiment divided by the duration of the experiment
Turning angle	Median of the angle difference between two movements
Meander	Median of the turning angle divided by instantaneous speed
Thigmotaxis while moving	Proportion of time spent on the edge of the platform versus the center of the platform (equal surfaces) while moving
Thigmotaxis while sitting	Proportion of time spent on the edge of the platform versus the center of the platform (equal surfaces) while being immobile
Stripe deviation	Median deviation angle between walking direction and direction toward the stripes
Number of walks	Number of times a fly walks between the two stripes during the experiment
Number of pauses	Number of times a fly stopped walking for more than 1s during the experiment
Activity bouts duration	Median duration of activity phases
Pause length	Median duration of pauses
Total time active	Sum of the length of activity phases during the experiment