Related Experiment Video
Updated: May 16, 2026
Reversible Cooling-induced Deactivations to Study Cortical Contributions to Obstacle Memory in the Walking Cat
Published on: December 11, 2017
The effects of time constraints on electrocortical dynamics underlying obstacle avoidance while walking
Marco A Bühler1, Sylvain Baillet2, Bradford J McFadyen3
1School of Physical and Occupational Therapy, McGill University, Montreal, QC, Canada; Feil and Oberfeld Research Centre, Jewish Rehabilitation Hospital site of CISSS-Laval and research site of the Montreal Centre for Interdisciplinary Research in Rehabilitation (CRIR), Laval, QC, Canada.
Short response times for obstacle avoidance increase prefrontal brain activity, while longer times engage sensorimotor networks. This highlights how time constraints shape cortical control of locomotion.
Area of Science:
- Neuroscience
- Motor Control
- Cognitive Neuroscience
Background:
- Cortical engagement is crucial for locomotor adaptations.
- The brain's response to obstacles depends on available time to react.
Purpose of the Study:
- To investigate electrocortical oscillations during obstacle avoidance with varying available response times (ARTs).
- To understand how temporal constraints influence cortical resource allocation in locomotion.
Main Methods:
- Utilized a treadmill-based virtual reality system for obstacle avoidance tasks.
- Recorded electroencephalography (EEG) from healthy adults during virtual obstacle stepping.
- Analyzed EEG data using independent component analysis (ICA) across cortical regions.
Main Results:
- Observed distinct spectral signatures in prefrontal, sensorimotor, parietal, and occipital regions.
- Short ARTs (1.5s) showed increased prefrontal theta, alpha, and beta synchronizations compared to long ARTs (4s).
- Long ARTs involved sensorimotor alpha desynchronization during clearance, which was reduced under short ARTs.
Conclusions:
- Tighter temporal constraints during obstacle avoidance enhance prefrontal cortex involvement.
- Reduced sensorimotor network activation occurs under short ARTs.
- Time-dependent cortical dynamics provide insights into locomotor adjustments and neurological disorders.
