Walking indoors, walking outdoors: an fMRI study

Area of Science:

• Neuroscience
• Motor Control
• Cognitive Neuroscience

Background:

• The observation/execution matching system, crucial for understanding actions, has been studied for object-directed movements but not extensively for locomotion.
• Investigating this system for walking is essential to understand how the brain processes self-initiated and observed gait.
• The influence of spatial context on the neural correlates of walking observation and execution remains largely unexplored.

Purpose of the Study:

• To determine if an observation/execution matching system is active during walking.
• To investigate whether the spatial context (open vs. narrow space) differentially recruits neural correlates during walking.
• To explore the neural basis of visuo-motor transformations in different spatial environments.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to scan participants.
• Participants either executed walking on a rolling cylinder or observed videos of walking in open or narrow spaces.
• The study compared neural activations during execution and observation conditions across different spatial contexts.

Main Results:

• Common bilateral activations in the dorsal premotor/supplementary motor areas and posterior parietal lobe were observed for both execution and observation of walking, supporting a matching system.
• Specific regions in the occipital-temporal cortex and middle temporal gyrus showed consistent activation when processing narrow spaces compared to open spaces.
• These findings suggest differential neural recruitment based on spatial context during walking.

Conclusions:

• The brain possesses an observation/execution matching system for walking, similar to object-directed actions.
• Spatial context significantly influences the neural processing of walking, particularly in visuo-motor transformations.
• These insights have potential applications in gait rehabilitation and sports training.