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A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
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Obstacle Crossing Differences Between Blind and Blindfolded Subjects After Haptic Exploration.

Arturo Forner-Cordero1, Valéria D Garcia2, Sérgio T Rodrigues3

  • 1a Biomechatronics Lab. Mechatronics Department , Escola Politécnica da Universidade de São Paulo , São Paulo , Brazil.

Journal of Motor Behavior
|June 3, 2016
PubMed
Summary

Blind individuals effectively compensate for vision loss when crossing obstacles, demonstrating spatial cognition similar to sighted individuals. Their haptic exploration aids in adapting movement strategies for safe obstacle navigation.

Keywords:
blindgaitobstacle crossingtoe clearancevisual information

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Area of Science:

  • Neuroscience
  • Human Movement Science
  • Sensory Compensation

Background:

  • Limited understanding of obstacle crossing in blind individuals post-haptic exploration.
  • Potential impact of long-term vision absence on spatial cognition.
  • Haptic information's role in guiding movement strategies for the blind.

Purpose of the Study:

  • To investigate the obstacle crossing abilities of blind individuals after haptic exploration.
  • To compare the motor strategies of blind, blindfolded, and sighted individuals.
  • To determine if blind individuals develop compensatory strategies for spatial navigation.

Main Methods:

  • Seven blind participants and seven sighted participants (with and without blindfolds) performed an obstacle crossing task.
  • Participants haptically explored obstacle size and position before crossing.
  • Kinematic data were analyzed for gait parameters and foot clearance during crossing.

Main Results:

  • Blindfolded participants adjusted foot clearance and toe-off distance differently than blind participants.
  • Blind individuals' obstacle crossing strategies closely resembled those of sighted participants.
  • Both blind and blindfolded groups exhibited greater foot clearance than sighted participants.

Conclusions:

  • Blind individuals demonstrate effective compensation for vision loss in obstacle crossing tasks.
  • Haptic exploration enables blind individuals to adapt spatial cognition for navigation.
  • Motor strategies in blind individuals show remarkable similarity to sighted individuals, indicating successful adaptation.