Figure 3.

Stimulus velocity challenge of the OKR. A, The course of the SPV versus the stimulus velocity (v_s) = 4°/s − 96°/s) for wt (n_wt = 18), bel fwd (n_bf = 18), and bel rev (n_br = 18) at a stimulus contrast of c_s = 100%. B, Same data plotted as slow-phase gain (SPG=SPV/v_s). The spatial frequency of the stimulus was 0.045 c/deg, and the stimulus velocity direction alternated every 5 s. Each condition was 30 s, of which only the last 20 s were included in the analysis. C, The peak eye velocity (v_e) reached during the saccades in the entire group was similar in all three groups across all stimulus velocities (F_(2,32) = 0.638; p = 0.535). Fish that did not generate a single saccade during one or more stimulus velocity conditions could not be included in the analysis (new sample sizes: n_wt = 10, n_bf = 10, n_br = 15).