Velocity profile of human horizontal saccades.
To assess saccadic trajectories, we evaluated the velocity profile using the 'skewness ratio' (the proportion of acceleration time to total saccadic duration) as a parameter. Horizontal cross-center saccades against target movements of 10 degrees, 20 degrees and 30 degrees were measured in 6 normal subjects using the magnetic search coil method. As the amplitude increased the period of the deceleration phase became prolonged: 10 degrees saccades were almost symmetrical and 30 degrees saccades were skewed to a ratio of about 0.3. A close relationship between duration and skewness ratio was found, and the skewness ratios of temporal saccades were smaller than nasal ones. This skewness ratio would be a useful parameter for assessing the velocity profile of human saccades.
Takagi
M
M
Department of Ophthalmology, Niigata University School of Medicine, Japan.
Abe
H
H
Hasegawa
S
S
Yoshizawa
T
T
Usui
T
T
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D009885:Ophthalmology / Q000379:methods; D012438:Saccades / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology