Disparity vergence double responses processed by internal error

Tara L. Alvarez, John L. Semmlow, Weihong Yuan, Paula Munoz

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25 Scopus citations


Disparity vergence eye movements occasionally exhibit two high-velocity components to a single step stimulus (Alvarez, T. L., Semmlow, J. L. and Yuan, W. (1998). Journal of Neurophysiology, 79, 37-44). This research investigates the neural strategy used to trigger the second component of double high-velocity vergence eye movements. Vergence doubles evoked by an experimental protocol that induces post-movement visual error were compared to doubles that occur normally. The second component of a visually evoked response double occurred later, and with slower dynamics, than that of a naturally occurring double. These differences in timing and dynamics indicate that natural double responses are mediated, at least in part, by a mechanism other than visual feedback. The faster dynamics and timing of natural doubles suggest that an internal monitoring process triggers these movements.

Original languageEnglish (US)
Pages (from-to)341-347
Number of pages7
JournalVision Research
Issue number3
StatePublished - Feb 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ophthalmology
  • Sensory Systems


  • Disparity vergence
  • Natural double responses
  • Neural strategy
  • Vergence doubles


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