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Related Experiment Videos

Dead zone for express saccades.

H Weber1, F Aiple, B Fischer

  • 1Department of Neurophysiology, University of Freiburg, Federal Republic of Germany.

Experimental Brain Research
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

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Express saccades, rapid eye movements, were observed in humans and monkeys. However, a "dead zone" for express saccades was found for small target eccentricities, suggesting a blocked pathway for these movements.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Primate Behavior

Background:

  • Saccadic eye movements are crucial for visual exploration.
  • Express saccades are a rapid subclass of these movements, typically occurring within 100-150 ms.
  • Understanding the factors influencing express saccade generation is key to understanding visual processing.

Purpose of the Study:

  • To investigate the characteristics of express saccades in humans and non-human primates.
  • To determine the effect of target eccentricity on express saccade generation.
  • To examine the relationship between saccade amplitude, velocity, and the 'main sequence' for small saccades.

Main Methods:

  • Measured saccadic eye movements in three humans and one rhesus monkey.
  • Utilized a gap task paradigm with varying target eccentricities (0.3 to 15 degrees).

Related Experiment Videos

  • Analyzed saccadic reaction times (SRT) and the velocity-amplitude relationship of saccades.

    • Main Results:

    • Express saccades were observed at larger target eccentricities (e.g., 4 degrees) with distinct SRT peaks (~100 ms in humans, ~70 ms in monkeys).
    • The express saccade peak disappeared for target eccentricities below 2 degrees, indicating a 'dead zone'.
    • Small saccades showed increased overshooting and deviated from the main sequence of saccade velocity versus amplitude.

    Conclusions:

    • A functional or anatomical 'dead zone' for express saccades exists for small target eccentricities.
    • The generation of express saccades is dependent on target eccentricity.
    • The dynamics of small saccades differ significantly, potentially indicating distinct neural control mechanisms.