January 1992
Volume 33, Issue 1
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Articles  |   January 1992
Catch-up saccade amplitude is related to square wave jerk rate.
Author Affiliations
  • L Friedman
    Laboratory of Biological Psychiatry, Case Western Reserve University, University Hospitals of Cleveland, OH 44106.
  • J A Jesberger
    Laboratory of Biological Psychiatry, Case Western Reserve University, University Hospitals of Cleveland, OH 44106.
  • L A Abel
    Laboratory of Biological Psychiatry, Case Western Reserve University, University Hospitals of Cleveland, OH 44106.
  • H Y Meltzer
    Laboratory of Biological Psychiatry, Case Western Reserve University, University Hospitals of Cleveland, OH 44106.
Investigative Ophthalmology & Visual Science January 1992, Vol.33, 228-233. doi:
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    • Get Citation

      L Friedman, J A Jesberger, L A Abel, H Y Meltzer; Catch-up saccade amplitude is related to square wave jerk rate.. Invest. Ophthalmol. Vis. Sci. 1992;33(1):228-233.

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Abstract

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 degrees/sec. An especially robust correlation was noted in normal controls between SWJ rate during pursuit and mean CUS amplitude (Spearman's rs = 0.87, P less than 0.0001). This correlation also was present in the psychiatric patients (rs = 0.53, P = 0.0006), although it was significantly weaker than in normal controls (P less than 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 (rs = 0.73, P = .0002) and both patient groups combined (rs = 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.

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