Fig. 3.

Mean head responses for each animal (n = 6) during 0.5 Hz head-free rotational stimuli. Gain values are expressed as the ratio of response slow-phase angular velocity to rotational stimulus velocity, and phase values are expressed relative to peak rotational stimulus velocity. Responses are shown for three axes of stimulation (A: pitch; B: roll; C: yaw), plotted against stimulus velocity. The dashed lines indicate the gain (unity) and phase (−180°) required for a perfectly compensatory response. Symbol shapes indicate different animals. Black lines, solid symbols = air off (default state); red lines, open symbols = air on (flight state).