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Fig. 2. Experimental set-up used to study the head movements during the `walking
condition'. The black line drawn along the sagittal axis of the head allows
angles corresponding to each nystagmic beats of the OCR to be measured. The
corresponding duration is given by the time code. (A) Onset of a slow phase
triggered by an anticlockwise stimulation; (B) end of the slow phase. Ob,
optokinetic ball; Sc, screen; Tm, treadmill.