Gap-overlap effects on latencies of saccades, vergence and combined vergence-saccades in humans

Mineo Takagi, Elliot Frohman, David S. Zee

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


We examined the effect of gap-overlap stimuli on the distribution of latencies for pure saccades, pure vergence and combined saccades and vergence in three normal subjects. With the gap stimulus, a distinct peak of "express saccades" occurred, both with and without associated vergence, but a distinct "express vergence" response was not identified. Nevertheless, with the gap stimulus there was a decrease in vergence latencies (17 msec), but less so than for saccades (41 msec). In the combined paradigm the gap effects on saccades and vergence resembled those for each component made alone. In addition, the latencies of the saccade and vergence components were linearly correlated with an average slope of 0.5. To explain these results we suggest that there is common signal processing at an early stage of saccade and vergence initiation, which is followed by activity that builds in separate trigger mechanisms that can be influenced by the conditions of fixation.

Original languageEnglish (US)
Pages (from-to)3373-3388
Number of pages16
JournalVision Research
Issue number23-24
StatePublished - Dec 1995


  • Fixation
  • Gap-overlap effect
  • Human
  • Saccade
  • Vergence

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems


Dive into the research topics of 'Gap-overlap effects on latencies of saccades, vergence and combined vergence-saccades in humans'. Together they form a unique fingerprint.

Cite this