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Stimulus contrast (cs) dependence of the spontaneous oscillations. Saccades were filtered when the eye velocity exceeded 18°/s. The SPV was derived by calculating the mean of the absolute eye velocity per condition. Conditions with a contrast of 100% and a vs of 8°/s were alternated with a still grating (vs = 0°/s) at differing contrasts (100-40-10-40-100%). Light gray bars, wt (n = 8); dark gray bars, bel rev (n = 7).
