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In 8 subjects with congenital nystagmus, clearly manifested nystagmus was present while awake, with eyes open and closed, and during a variety of experimental tests, but could not be definitely discerned during REM and NREM sleep stages. However, conjugate REMs were present during the REMPs of all 8 subjects and could not be distinguished from patterns recognized in normal subjects. Brief episodes of reduced amplitude series of jerks were occasionally observed which could be considered to be “depressed” nystagmus, but such phenomena have been observed in the records of normal subjects. This replicates the findings of our previous report.

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