The Squirrel Monkey Stabil1metry

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Abstract
In order to characterize postural ataxia associated with peripheral vestibular lesions, a T-perch recording system suitable for squirrel monkeys (tree-living primates) was developed. This system includes strain gauges for detecting movement of the vertical shaft in the directions of anterior-posterior and left-right. Simultaneously EEG, vertical eye movement, ECG and respiration (by pneumography) were measured. Representative dynographic records (obtained during sleep) after unilateral and bilateral (2-staged) labyrinthectomy showed the frequent occurrence of phasic body movements: slow deviations to the lesion side and the frontward and subsequent quick rightings which occurred almost synchronously with the sleep becoming shallow (judged by EEG).