Catch-up saccade amplitude is related to square wave jerk rate

L. Friedman*, J. A. Jesberger, L. A. Abel, H. Y. Meltzer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Mean catch-up saccade (CUS) amplitude and square wave jerk (SWJ) rate during pursuit were recorded in 20 normal controls, 23 patients with schizophrenia, and 15 patients with affective disorder, using infrared oculography. Target speed during pursuit was 5°/sec. An especially robust correlation was noted in normal controls between SWJ rate during pursuit and mean CUS amplitude (Spearman's r(s) = 0.87, P < 0.0001). This correlation also was present in the psychiatric patients (r(s) = 0.53, P = 0.0006), although it was significantly weaker than in normal controls (P < 0.02). There were no significant differences between the patient groups regarding the strength of the relationship. Furthermore, similar strong correlations between SWJ rate during fixation and mean CUS amplitude also were found for normals (r(s) = 0.73, P = .0002) and both patient groups combined (r(s) = 0.52, P = 0.0009). The results suggest that saccadic intrusions during tracking tax the saccade correcting system, delaying correction for the position error that accumulates when gain is less than 1.0.

Original languageEnglish (US)
Pages (from-to)228-233
Number of pages6
JournalInvestigative Ophthalmology and Visual Science
Issue number1
StatePublished - 1992

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience


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