Fig. 6.

Simulations indicate that zebrafish does not need gradient information to perform negative thermotaxis. A Example trajectories generated with a simulation based on rescaled multivariate distributions (see “Methods” section). B Mean square displacement, from data (dots) and simulation (line). C Mean square reorientation, from data (dots) and simulation (line). D Distributions of presence of simulated fish through time, for four strengths of temperature gradient. The white curve is the average position over time. The expected value for a uniform distribution is highlighted on the colormap. E Steady-state distribution of presence as a function of temperature. The dashed line is the expected value for an uniform distribution. F Temporal evolution of the average position over time (only the first 75 bins are shown for readability). G Distribution mean as a function of the time rescaled by the squared pool length