Aiming to elucidate whether the blood glucose level can be estimated from the saliva glucose level or not, this study was made to establish a sampling method of saliva available for the determination of saliva glucose level. Next, 75 gOGTT was carried out in six healthy adults for three days and the time-course changes in the glucose level in blood and saliva and were simultaneously determined. As the results, it revealed that the saliva glucose levels in the normal subjects varied within arange of 1/50∼1/100 of their blood glucose levels. The former level of all subjects was not correlated with the latter with a correlation factor of O.37, but personal correlation factor was O.76± 0.10(mean±SD). The present study demonstrated that there are a positive correlation between the blood glucose level and the saliva one of an identical subject.

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The static and dynamic tracking ability of a newly devised eye-tracker is presented. It detects the direction of gaze with an error of O.8 degrees. This accuracy is sufficient for the operation of MS Windows applications.

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As described in the series(I)'s paper of this study the auditory brainstem responses(ABR)is well known as being well suited for the auditory clinical application. Especially, the peak latency of the ABR wave V is a reliabale index for the clinical neurologic examination. This paper is the series(II)of this study, and reports the derivation of a practical formula by appling the linear reguressiom analysis method and the 3 dimensional function the type of which was estimated in the series(I)'s paper to the experimental data of the peak latencies of the wave V of 30 normal adult subjects who were evoked by the click stimulation the parameters of which were changed within 30 and 90 ndB HL in the intensity, 12.5 to 50.0 ms in the interval, and 0.1 to 1.0 ms in the duration. It is confirmed that this experimental formula the coefficents of which were optimized within the laid parameter's ranges is a very practical index to estimate the normal peak latency of the click evoked ABR within those ranges.

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