Cross-correlation between the head movement and the movement of the center of gravity while standing.

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Cross-correlation analysis between the head movement and the movement of the center of gravity was performed to obtain basic data on normal subjects.<BR>A recording apparatus to determine the head movement consists of an industrial television set which picks up the movement of a light-emitting diode on the helmet which the standing subject is wearing and transmits the movement in terms of voltage to a preamplifier connected to a wave control unit and finally to an X-Y recorder. A system for recording the movement of the center of gravity consists of a straingauge-platform on which the subject stands and the movement in voltage is transmitted to a preamplifier and to an X-Y recorder. The information obtained from the head and the center of gravity can at the same time be fed into a data recorder, which separately stores the data on anteroposterior and lateral displacements on magnetic tape. The data recorded on the tape were fed into a processor for cross-correlation analysis.<BR>Three types of cross-correlograms were classified according to the characteristics shown in the correlograms which were obtained from normal subjects standing with eyes open and with eyes closed. The type A correlogram revealed a random and sine wave process of about 0.3Hz with the eyes open and 0.5Hz with them closed. Type B showed a random and sine wave process of 0.3Hz with the eyes open and 1.0Hz superimposed on 0.3Hz wave with the eyes closed. Type C was a random and sine wave process of about 0.6Hz with the eyes open and 0.3Hz with them closed.
日本めまい平衡医学会の論文

著者

田口喜一郎
信州大学医学部耳鼻咽喉科学教室

Cross-correlation between the head movement and the movement of the center of gravity while standing.

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