Investigation into corrective saccadic eye movements for refixation amplitudes of 10 degrees and below

The results indicate a much higher percentage of undershoots than has been previously reported and it is hypothesized that the frequency and mean amplitude of saccadic errors are dependent upon whether the subject responds solely to the visual stimulus or whether some extra-retinal factor such as knowledge of the target location is involved.

Abstract

The frequencies and mean amplitudes of corrective saccadic eye movements have been measured in five subjects for refixational amplitudes of 10° and below. The results indicate a much higher percentage of undershoots than has been previously reported. This is explained on the basis of different types of experimental procedures. It is hypothesized that the frequency and mean amplitude of saccadic errors are dependent upon whether the subject responds solely to the visual stimulus or whether some extra-retinal factor such as knowledge of the target location is involved.