Three Dimensional Analysis of Various Types of Saccade

研究了5名正常人的视导扫视、反扫视和记忆扫视的特征。结果表明，视觉引导的扫视速度最快，反扫视速度比记忆扫视速度快。此外，在记忆扫视中，速度和振幅之间的关系比在其他扫视中更为分散。视觉引导扫视由视觉输入触发（外部触发），而记忆扫视由目标位置记忆触发（内部触发）。视觉引导的扫视向真实目标移动，而反扫视和记忆扫视都向非视觉目标移动。因此，本研究的结果可能是由于眼跳的触发和方向的差异。用搜索线圈技术记录9例正常受试者的水平、垂直和斜扫视，并在不同方向(1)内收和外展，2)向上和向下，3)中心和偏心，4)水平、垂直和斜向)上观察扫视特征。在振幅为10°时，外展扫视比外展扫视快，在振幅为20°和30°时，中心扫视比偏心扫视快，垂直方向向上扫视和中心扫视在所有振幅下都比其他扫视快。斜扫视水平分量的峰值速度随刺激方向角度的增大而减小。另一方面，随着刺激方向角度的减小，斜扫视垂直分量的峰值速度有变快的趋势。因此，不同方向的扫视速度存在显著差异。

The characteristics of various types of saccades, including visually guided saccade, antisaccade and remembered saccade, were investigated in 5 normal subjects. As the results, the visually guided saccades were the fastest, and the antisaccades were faster that the remembered saccades. Furthermore, in the remembered saccade, the relationships between the velocity and amplitude were more markedly scattered than those in the other saccades. The visually guided saccade was triggered by the visual input (external trigger), while the remembered saccade was triggered by the memory of the target position (internal trigger). The visually guided saccades moved toward the real target, while both anti- and remembered saccades moved toward the non-visually target. Consequently, the results in this study might be due to the differences in the trigger and the direction of the saccades.Horizontal, vertical and oblique saccades were recorded with search coil technique in normal 9 subjects and the characteristics of the saccades were investigated in different directions, i.e. 1) adduction and abduction, 2) upward and downward, 3) centric and eccentric, and 4) horizontal, vertical and oblique directions. The abducting saccades were faster than the abducting saccades at the amplitude of 10 deg, while the centric saccades were faster than the eccentric saccades at the amplitudes of 20 and 30 deg. Both the upward and centric saccades in vertical directions were faster than the others at all amplitudes. The peak velocity of horizontal component of oblique saccades was decreased according to an increase in the angle of the stimulus directions. On the other hand, the peak velocity of vertical component of oblique saccades had a tendency to be faster according to a decrease in the angle of the stimulus directions.Consequently, there were significant differences of the velocity of the saccades in the different directions.