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Fig. 3. Examples of optocollic responses obtained in the same animal for different behavioural conditions. The stimulation (stim.) was a velocity step of 200 deg. s-1 delivered clockwise. Upper traces, head position; lower traces, head velocity. A broken line has been drawn for a head velocity of 50 deg. s-1 to aid comparison of the maximal slow phase velocity obtained for the three conditions. The time course of the stimulation and the time scale are indicated at the bottom of the figure. (A) `Resting condition'. Note the irregular time course of nystagmic beats and of the slow phase velocity. (B) `Standing condition'. Nystagmic beats are larger and more regular, and the slow phase velocity is higher than in the `resting condition'. (C) `Flying condition'. Nystagmic beats are regular and centred around the axis of the body. The slow phase velocity is higher than in the `standing condition'.





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