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Related Experiment Video

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Behavioral Assessment of the Aging Mouse Vestibular System
09:30

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Published on: July 11, 2014

Old age affects gaze and postural coordination.

Caroline Paquette1, Joyce Fung

  • 1School of Physical and Occupational Therapy, McGill University, Montreal, Quebec, Canada.

Gait & Posture
|December 8, 2010
PubMed
Summary
This summary is machine-generated.

Aging impairs visual tracking accuracy and increases gaze errors, especially during challenging postural tasks. Elderly individuals show reduced precision in saccadic and smooth pursuit eye movements compared to younger adults.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Ophthalmology

Background:

  • Visual tracking and postural control are crucial for daily activities.
  • Aging can negatively impact sensory and motor functions, affecting visual-postural coordination.
  • Understanding age-related changes in eye movement control is vital for maintaining functional independence.

Purpose of the Study:

  • To investigate the effects of aging on saccadic and smooth pursuit eye movements.
  • To assess how postural challenges (standing on a moving surface) influence visual tracking in different age groups.
  • To determine if age-related declines in visual tracking are exacerbated by altered sensory input.

Main Methods:

  • Nineteen young and 12 elderly participants performed visual tracking tasks (saccadic and smooth pursuit).
  • Eye movements were recorded while subjects stood still or on a rotating surface (yaw rotations).
  • Accuracy, time lag, and catch-up saccades were measured to quantify gaze control.

Main Results:

  • Elderly subjects demonstrated lower accuracy in tracking both saccadic and smooth pursuit targets compared to young subjects.
  • Older adults exhibited longer reaction times for saccadic shifts and more catch-up saccades during smooth pursuit.
  • Postural instability (moving surface) increased gaze errors, with more frequent catch-up saccades during perturbations.

Conclusions:

  • Visual tracking abilities, including saccadic and smooth pursuit, decline with age.
  • Postural challenges negatively impact the accuracy of gaze responses in older adults.
  • Age-related deficits in visual tracking may stem from cumulative minor sensory and motor impairments.