Fig. 2.

Angular head velocity profiles during rotation (A) and at the onset of motionlessness (B) experienced in the braking protocol. A: the amount of angular head velocity experienced during recordings of head direction (HD) cells during passive rotations in between periods of motionlessness (n = 41). The solid points represent the amount of time in seconds the rat spent rotating at a given angular head velocity, and the fine lines represent the standard error around each point. Head velocities were binned in 5°/s increments, and times were pooled by individual samples (1/60 s). Each recording period in between the four 30-s periods of motionlessness contained 90 s of rotation. The most time spent at any given rotational velocity was 2.1 s and occurred at 150°/s (red diamond). B: mean angular head velocity experienced immediately before and after the cessation (braking) of passive rotations. Each session was aligned to the time point of movement cessation for 163 trials across 41 cells. Angular head velocity was sampled at 60 Hz. The dark line represents the mean velocities, and the fine lines are the standard error around the mean.