A novel technique for examining human brain activity associated with pedaling using fMRI

Area of Science:

• Neuroscience
• Motor Control
• Medical Imaging

Background:

• Functional magnetic resonance imaging (fMRI) enables brain activity imaging during motor tasks.
• Imaging brain activity during complex lower limb movements like locomotion presents technical challenges.
• Previous fMRI studies faced difficulties with magnetic field distortions during leg movements.

Purpose of the Study:

• To develop and validate a method for recording human brain activity during pedaling using fMRI.
• To investigate the neural correlates of rhythmic lower limb movements.
• To overcome technical limitations in imaging brain activity during locomotion.

Main Methods:

• Developed an MR-compatible pedaling device for use in a 3T scanner.
• Recorded fMRI signals from ten volunteers pedaling at 30 RPM using a block design.
• Adapted fMRI analysis to focus on the blood-oxygen-level dependent (BOLD) signal during movement-free periods to mitigate motion artifacts.

Main Results:

• Observed physiologically plausible brain activity patterns in sensory-motor cortices and the cerebellum during pedaling.
• Successfully recorded fMRI signals associated with rhythmic lower extremity movement.
• Demonstrated the efficacy of analyzing the delayed BOLD signal post-movement.

Conclusions:

• This study presents the first fMRI recording of human brain activity during pedaling.
• The adapted fMRI analysis technique effectively captures neural signals despite motion artifacts.
• This method holds potential for advancing the understanding of supraspinal control in locomotion and related neurological conditions.