Analysis of Saccadic Eye Movements Using an Infrared Video System in Human Subjects

Abstract

Horizontal and vertical saccades were recorded and quantitatively analyzed with an infrared video recording system in 6 normal human subjects. Peak and mean saccade velocities increased exponentially as the amplitude increased. Peak velocity of horizontal saccade was significantly larger than that of vertical saccade (p<0.05, ANOVA test). On the other hand, duration and latency showed a linear relationship with saccade amplitude. Latency was constant (i.e. 0.21 s) irrespective of saccade amplitude in the regular eye tracking mode; however, latency slightly increased as the amplitude became larger in the randomized eye tracking mode. As a result, a slight positive correlation could be found between saccade amplitude and latency: r=0.50 and 0.35 in horizontal and vertical sac-cades, respectively.

Key Words:

• ocular saccade
• human
• infrared video EOG