不規則跳躍視標追跡検査(At Random Skipping Eye-Tracking Test)による,衡動性眼球運動の定量化の試み

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In a preliminary report, the skipping eye tracking test in a stepwise jump manner with the same interval was described. Certain predictive controls of saccadic eye movements were observed in this method. To reject the predictive control for the stepwise jump, the saccadic visual stimuli were controlled with random stepwise jumps by means of a small general purpose digital computer (PDP-11/40).These saccadic visual targets were applied by seven small lamps horizontally placed at the same interval with 8° of visual amplitude and turned on in a random stepwise jump manner with periods of 0.8, 1.0 and 1.2 second. Details of the recording system and the analysis of data were given in a preliminary report. (Igarashi, et al. Equilibrium Res. 37 (1) 1978)To evaluate the rapid quantitative measurement of saccadic eye movements, saccadic amplitude, latency, duration, and velocity (in maximum and average) were analyzed on the digital computer. The patterns of saccadic eye movements velocity were also recorded in an attempt to detect abnormal saccade movements. In 7 normal subjects tested, the latency was fairly constant with no correlation of the amplitude. These saccadic eye movements were increased with relation to the jumped target amplitude within 32° of the visual amplitude.However, the saccade amplitude and the maximum eye velocity had a nonlinear relationship. Such was also observed by Baloh Neurology 25 (1975). In the same normal subjects (27.2%), the irregular saccadic eye movements were evident in these examinations.Thus, decrease in the maximum eye velocity and the appearance of two or three peaks in the velocity patterns were characteristic abnormal findings in this test. Moreover, from our observations, it can be concluded that the duration, amplitude, and velocity of the saccadic eye movements in these methods are most appropriate parameters for clinical observations.
耳鼻咽喉科臨床学会の論文

不規則跳躍視標追跡検査(At Random Skipping Eye-Tracking Test)による,衡動性眼球運動の定量化の試み

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