Legend To Videotape

Postural Instability: Video segment shows a patient with a history of falls and an impaired postural reflex with the backward pull test. The patient would have fallen, unless aided by the examiner. The gait is stable but slightly wide-based.

Supranuclear gaze palsy: This patient shows a severe limitation in the range of ocular motor movements observed, which affects more upward than downward voluntary and pursuit gaze. As observed, the oculocephalic reflex is preserved when the the doll's head maneuver is performed.

Slowing of vertical saccades: Patient shows markedly slow vertical saccades and relatively preserved horizontal saccades.

Ocular motor apraxia: The patient shows difficulty initiating the voluntary gaze and saccades but exhibits a preserved pursuit and optokinetic nystagmus. Once the saccades are initiated their speed is normal.

Corticosensory deficits: This patient shows right sensory neglect and agraphesthesia. These later-alized cognitive features in conjunction with the progressive development of a right ideomotor apraxia, dystonia, and stimulus sensitive myoclonus led to the diagnosis of corticobasal degeneration (corticobasal syndrome).

Limb kinetic apraxia: The performance of this patient does not improve with imitation. Movements are coarse and do not represent the intended action.

Blepharospasm: Difficulty opening the eyes because of inhibition of eyelid opening, which is followed by blepharospasm.

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