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Related Experiment Videos

Adapting to monocular vision: grasping with one eye

J J Marotta1, T S Perrot, D Nicolle

  • 1Department of Psychology, University of Western Ontario, London, Canada.

Experimental Brain Research
|January 1, 1995
PubMed
Summary

Enucleated patients, unlike normal subjects using one eye, exhibit increased head movements during visually guided grasping. This suggests they use head motion to enhance depth perception and improve object manipulation.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Biomechanics

Background:

  • Binocular vision typically aids in depth perception and object manipulation.
  • Head movements can compensate for visual field limitations.
  • The role of head movements in visually guided grasping for individuals with monocular vision is not fully understood.

Purpose of the Study:

  • To compare head movements during visually guided grasping in normal subjects (binocular vs. monocular vision) and enucleated patients vs. controls.
  • To investigate if monocular vision or enucleation leads to increased head motion during reaching and grasping tasks.

Main Methods:

  • Experiment 1: 14 normal subjects performed a reaching and grasping task binocularly and monocularly.
  • Experiment 2: 7 enucleated patients and 7 matched controls performed the same task under binocular and monocular conditions.

Related Experiment Videos

  • Kinematic analysis of reach, grasp, and resultant head movements (lateral, vertical).

    • Main Results:

    • Normal subjects showed no difference in head movements between binocular and monocular conditions.
    • Enucleated patients exhibited larger and faster resultant head movements compared to controls.
    • Head movements in enucleated patients were primarily lateral and vertical.

    Conclusions:

    • Enucleated patients may increase head movements to enhance retinal motion cues for improved manual prehension.
    • Head mobility can serve as a compensatory mechanism for individuals with monocular vision.
    • Altered head movement strategies are employed by enucleated patients to navigate and interact with their environment.