Video 2. Patient number 2 is shown in three segments. segment 1. A home video demonstrates an oculogyric episode, with eyes elevated upward with intermittent lateral deviation, accompanied by head tilt to the left and jaw deviation to the right. She was uncomfortable but did not lose consciousness. This episode lasted almost 1 minute, after which she partially recovered and looked exhausted. About 20 seconds afterwards, she developed oculogyria with upward eye deviation again. Segment 2. The second home video segment shows her in a stroller. She developed dystonic posturing of her neck with tilting to the left and lateral rotation to the right, accompanied by dystonic posturing of her hands and jaw opening. She recovered before her mother transferred her to a cushion. Segment 3. This video segment shows her during her initial office evaluation, already treated with levodopa. Her speech was mildly soft and indistinct with no ocular motor abnormalities. Mild symmetric dystonic posturing of both hands with intermittent choreiform movements of her fingers was present. There was no parkinsonism or dysmetria. She walked well with good arm swing.

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