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Horizontal saccade dynamics across the human life span.

Elizabeth L Irving1, Martin J Steinbach, Linda Lillakas

  • 1School of Optometry, University of Waterloo, Waterloo, Ontario, Canada. elirving@sciborg.uwaterloo.ca

Investigative Ophthalmology & Visual Science
|May 26, 2006
PubMed
Summary

Saccade dynamics like latency, accuracy, and velocity change significantly with age, showing distinct developmental and aging patterns. These findings offer insights into age-related changes in the brain

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Gerontology

Background:

  • Saccade dynamics are crucial for visual processing and can be influenced by age.
  • Weale's model of aging predicts specific patterns of development and decline in physiological functions.

Purpose of the Study:

  • To investigate how saccade dynamics (latency, accuracy, velocity) change across the lifespan.
  • To determine if these age-related changes align with Weale's model of aging.

Main Methods:

  • 195 participants aged 3-86 years performed visually guided horizontal prosaccades (1-60 degrees).
  • Eye movements were recorded binocularly using a video-based eye tracker (120 Hz sampling).
  • Saccadic latency, accuracy (amplitude gain), and peak velocity (Vmax) were analyzed as a function of age.

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Main Results:

  • Saccadic latency decreased from age 3 to 14, stabilized until age 50, then increased in older adults.
  • Saccadic accuracy (amplitude gain) showed a significant interaction with age and saccade size, with increasing hypometria at older ages and larger saccade sizes.
  • Peak saccadic velocity (Vmax) increased during childhood, peaking at age 14, and then declined progressively with age.

Conclusions:

  • Age significantly impacts saccadic latency, accuracy, and velocity.
  • Each saccade parameter exhibits a unique developmental and decline trajectory.
  • These distinct patterns likely reflect age-related changes in specific brain regions controlling these functions.