A series of rotatory tests and caloric tests wa performed to know the vestibular reactions of nor mal children who were in the range of age fron new born up to 15 years old. Time duration o f nystagmus, frequency of nystagmus, and maximun eye-speed in slow phase of nystagmus (MES) to each stimulation were examined and their normal values and their differences in variou ages were evaluated.
1) Vestibular organ of those subjects, even an infant, can react to the stimulation. The reac- tion can be quantitatively estimated according to the nystagmus which served as a standard.
2) The tests can be applicable regardless of children's age.
3) Vestibular reactions of new born infants and older children up to the age of three were recog - nizable. But in many cases, their reactions can hardly be measured quantitatively.
4) With regard to duration and frequency of nystagmus very faint reactions were recognized in the children under four years old. The dura - tion of postrotational nystagmus in the youngest group was approximately 40 seconds, and that of caloric nystagmus extended to about 300 seconds. These reaction values were about 20 per cents of those for adults. In children ranging in age from 4 years to 6 years, the reaction values increased remarkably to almost the same level as adults. The reaction values of the children between seven and nine years old were the highest of all from 0 to 15 years old. The highest values mentioned above were approximately 80 seconds in the dura- tion of postrotational nystagmus and about 650 seconds in that of caloric nystagmus. The chil- dren who were above ten years old showed less reaction values in proportion to growth of age until they reached down to the reaction values of adults.
5) Not same as to the time duration and fre- quency of nystagmus, the reaction of MES was found much in those of low age group, and dec- reased in accordance with age.
6) It was considered that the standard to eva- luate the vestibular reaction of children should be firstly the time duration of nystagmus, secondly frequency of nystagmus, and then MES.
7) The results of examining CP (canal paresis) and DP (directional preponderance) of caloric test led to the conclusion that if CP was more than 12*per cent and DP more than 15 per cent, it made doubt as an abnormal case furthermore, if CP went up to 25 per cent or more, and DP more than 35 per cent, such a case was pathologic withaut doubt.
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