Fig. 7. Examination of the input–output relationships of the crab's compensatory rotation on the disk. Means (solid lines) and S.D. (broken lines) of time-lagged cross-correlations for all 15 trials, between: crab egocentric and disk angular velocities (sign reversed, blue line with circles); crab egocentric angular velocity and crab orientation (sign reversed, red line with triangles); crab egocentric angular velocity and orientation error (this is affected by both rotation and translation; black line with squares). Positive lags indicate disk angular velocity, crab orientation or orientation error leading in time, negative lags indicate crab egocentric angular velocity leading.