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This article includes supplementary video clips, available online at http://www.interscience.wiley.com/jpages/0885-3185/suppmat

FilenameFormatSizeDescription
mds21650-MDS21650.mpg13825KOn the video the patient was stimulated on one side then bilaterally and asked to execute voluntary eye movements toward both sides, without presentation of any visual target. The three first segments (A, B, C) show CED to the left induced by stimulation on the right side.Segment A. Unilateral stimulation on the right contact 2 (3.4 V) inducing CED to the left. The patient is unable to gaze to the right until the voltage is decreased to 3.1 V.Segment B. Unilateral stimulation on the right contact 2 (3.4 V) inducing CED to the left. The patient is unable to gaze to the right until concurrent stimulation (0.5 V) is applied on left contact 1.Segment C. With bilateral stimulation (3.4 V on the right and 0.5 V on the left), the gaze is in straight-ahead position. When left stimulation is stopped, CED to the left resumes.Segment D. It shows CED to the right induced by stimulation on the left side. The sequence showing CED induced on left contact 1 was of poor quality; we only present CED induced on left contact 2. Increasing unilateral stimulation on the left contact 2 from 4.4 to 4.5 V induces CED to the right and associated contraversive head deviation.

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