Influence of Repeated Unidirectional Rotatostimulation on Squirrel Monkey's Perrotatory Nystagmus

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In this investigation of response decline (RD) phenomenon of the vestibulo-ocular reflex (VOR), five healthy squirrel monkeys were rotated repeatedly in a darkroom. First they were rotated clockwise for 5 sec at a constant angular acceleration of +20°/sec2, then decelerated slowly to the zero point by subliminal clockwise rotation of -0.4°/sec2. This rotation was repeated 20 times a day for 2 weeks. The constant angular acceleration test performed after repetition of the rotatostimulation showed "directional preponderance (DP) to the left", which was caused by the RD phenomenon in the slow phase eye velocity (SEV) of right beating nystagmus. However, significant DP was not observed in other nystagmus parameters, such as "duration", "jerk number", and "quick phase velocity". The DP of SEV tended to decrease during a rest of 24 hours after stimulation and disappeared completely after a rest of 2 weeks.
日本めまい平衡医学会の論文