Evidence supporting open-loop control during early vergence

John Semmlow, Tara Alvarez, Bérangère Granger-Donetti

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Disparity vergence eye movements were analyzed to determine if the early component of this response operates under open-loop, or preprogrammed, control. The analysis compares ratios of peak velocity to response amplitude (i.e., main sequence ratios) for the isolated early component and for the entire disparity vergence response. The stimuli were limited a 4 deg step changes in vergence so that any differences in movement dynamics (i.e., peak velocities) were due only to internal noise. Nine binocularly normal subjects were studied. A significant correlation between peak velocity and amplitude was observed during the early portion of the movement (p < 0.002), but not for the overall vergence response. Results support the widely held, but unproven assumption that the early component of symmetrical vergence is guided by open-loop, or preprogrammed, control processes while the overall response is influenced by external and/or internal feedback.

Original languageEnglish (US)
Article number2
JournalJournal of Eye Movement Research
Issue number4
StatePublished - 2013

All Science Journal Classification (ASJC) codes

  • Ophthalmology
  • Sensory Systems


  • Fast component
  • Initial component
  • Open-loop
  • Preprogrammed
  • Vergence


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