Example of best-fit acceleration model (Acc) to the spatiotemporal vestibular responses of a double-peaked Purkinje cell (same example as shown in Fig. 2). A, Direction-time color plot illustrating how direction tuning evolves over the time course of the response (spatial and temporal resolution: 45° and 100 ms, respectively). B, Model fits (left) and corresponding response residuals (right): acceleration (model Acc, r2 = 0.735), velocity (model Vel, r2 = 0.35), acceleration + velocity (model AccVel, r2 = 0.74, wa = 0.9, wv = 0.1), and acceleration + velocity + position (model AccVelPos, r2 = 0.741, wa = 0.9, wv = 0.1, wp = 0.07). C, Response PSTHs for eight directions in the median plane together with superimposed curve-fitting lines for each model: Acc (black), Vel (red), AccVel (green).