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Related Concept Videos

Indirect Motor Pathways01:22

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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
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Studying the Neural Basis of Adaptive Locomotor Behavior in Insects
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How humans use visual optic flow to regulate stepping during walking.

Mandy M Salinas1, Jason M Wilken2, Jonathan B Dingwell1

  • 1Department of Kinesiology & Health Education, University of Texas, Austin, TX 78712, USA.

Gait & Posture
|June 2, 2017
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Summary
This summary is machine-generated.

Healthy humans use visual optic flow to regulate walking speed. Removing optic flow led to cautious walking with increased stride variability, demonstrating its crucial role in maintaining stable gait.

Keywords:
GaitHuman locomotionOptic flowStepping control

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Area of Science:

  • Biomechanics
  • Human locomotion
  • Visual perception

Background:

  • Humans regulate walking speed using visual optic flow.
  • Stride speed deviations are rapidly corrected, while stride length and time fluctuations persist.
  • Previous studies confirmed this strategy in the absence of optic flow.

Purpose of the Study:

  • To investigate how removing or altering optic flow affects human stride-to-stride walking control.
  • To determine the influence of optic flow temporal characteristics on gait stability.

Main Methods:

  • Participants walked on a treadmill with a virtual reality system projecting different optic flow conditions (blank, static, slow, matched, fast).
  • Stride length (L_n) and stride time (T_n) were measured to analyze stride speed (S_n = L_n/T_n) control strategies.
  • Gait variability and correction of speed deviations were assessed across conditions.

Main Results:

  • Removing optic flow (blank screen) resulted in shorter, faster strides and increased gait variability, indicating cautious walking.
  • Optic flow significantly influenced the speed of correcting stride speed deviations.
  • Correction speed was faster in the no-optic-flow condition, consistent with Weber's law.

Conclusions:

  • Visual optic flow is essential for maintaining stable walking speed and reducing gait variability.
  • The temporal characteristics of optic flow modulate the ability to correct walking speed fluctuations.
  • Altered optic flow conditions impact human locomotion control strategies, highlighting the sensory integration in gait regulation.