Abstract
We investigated the distribution of the maximum velocity of the slow phase of nystagmus (max. spv) induced by cold air caloric stimulation, that were evaluated as normal responses in different age groups. Test subjects who had no spontaneous nystagmus with eyes open in darkness and showed max. spv of caloric nystagmus above 20 degrees/sec were selected.The distribution histogram of the values of max. spv in all 355 subjects (710 ears) was skewed and different from Gaussian distribution. Each value was much more concentrated at the level above the mean value than at the level below it. The subjects were classified into three groups, such as the younger (20-39 years old), the middle aged (40-64 years old) and the older group (above 65 years old) and the distribution of max. spv in each group did not show a Gaussian distribution. The mean value of max. spv in the younger group was significantly higher than one in the older group. The values in both the younger and middle aged group tended to be higher than the mean but those in the older group did not.In conclusion, we must remain aware that when we obtain the normal range of cold air caloric nystagmus, max. spv of caloric nystagmus does not show a Gaussian distribution, especially in the elderly.
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