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Early Blindness Limits the Head-Trunk Coordination Development for Horizontal Reorientation.

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Early blindness impairs head-trunk coordination for horizontal movements. Despite this deficit, early blind individuals compensated to maintain spatial task performance, highlighting vision's role in motor development.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Developmental Psychology

Background:

  • Head-trunk coordination is crucial for goal-directed horizontal movements during locomotion.
  • Early visual loss is associated with motor control deficits, but its impact on head-trunk coordination is unknown.

Purpose of the Study:

  • To investigate the effect of early blindness on the development of head-trunk coordination for horizontal rotations.
  • To assess if early blind individuals exhibit deficits in coordinating head and trunk movements.

Main Methods:

  • Tested early blind and sighted individuals on a dynamic sound alignment head-pointing task in acoustic virtual reality.
  • Assessed head and trunk kinematics individually and relationally, with and without trunk immobilization.
  • Evaluated spatial task performance.

Main Results:

  • Early blind participants demonstrated a significant head-trunk coordination deficit during horizontal rotations.
  • Despite the coordination deficit, early blind individuals successfully compensated by reducing trunk movement, preserving spatial performance.
  • Vision plays a critical role in the developmental acquisition of head-trunk coordination.

Conclusions:

  • Early blindness negatively impacts the development of head-trunk coordination for horizontal orientation.
  • Compensatory strategies in the absence of vision can maintain spatial task accuracy.
  • Further research is needed to understand the implications of this deficit in complex daily activities.