Summary: New research reveals that walking changes how the brain processes sounds, sharpening auditory responses compared to standing still. While volunteers walked a figure-eight path, their brain activity showed stronger reactions to sounds, and the direction of turns shifted processing between ears, enhancing or suppressing responses depending on the turn.
Brief bursts of tones produced different neural patterns, especially when sounds were delivered to a single ear. The authors propose that the brain suppresses predictable background noises—such as footsteps—while amplifying attention to unexpected or novel sounds, enabling faster reactions in dynamic environments.
Key Facts
- Movement Boost: Walking amplifies neural responses to sound compared with standing or walking in place.
- Directional Effect: Turning right or left shifts auditory processing between ears, suggesting momentary shifts in attention during turns.
- Novelty Detection: The brain appears to filter routine sounds while increasing sensitivity to unexpected auditory events.
Source: SfN
Does walking influence how the brain processes sensory information, like sounds?
In a recent paper published in the Journal of Neuroscience, researchers led by Liyu Cao of Zhejiang University and Barbara Händel of the University of Würzburg investigated how locomotion and turning direction affect auditory processing. They recorded brain activity while volunteers walked along a figure-eight path and listened to a continuous stream of sounds whose intensity varied over time.
Thirty participants took part in the experiment. While walking, participants’ brains produced stronger auditory responses than when they were standing still or walking in place. The magnitude of these walking-related changes was comparable to experimental adjustments made directly to the sound intensity, indicating that locomotion itself can substantially influence auditory neural gain.
Importantly, the researchers found that the direction of turning altered auditory responses. As Cao explains, “When people made a right turn, responses to sounds from the right ear were enhanced at the beginning of the turn and then suppressed, relative to responses to sounds from the left. This could reflect a change in attention during turns.” In short, movement-related shifts in orientation appear to bias auditory processing toward or away from the side toward which a person is turning.
The team also introduced sudden tone bursts into the ongoing sound stream. These unexpected tones disrupted the brain’s ongoing associative response and elicited distinct neural responses. As with continuous sounds, the effect of these tone bursts was strongest during walking—but notably, this heightened sensitivity emerged only when the bursts were presented to a single ear rather than simultaneously to both ears. This pattern points to enhanced peripheral sensitivity during natural locomotion.
Taken together, the results suggest the brain performs a flexible filtering operation during movement: routine, predictable inputs such as one’s own footsteps are downweighted, while unexpected or peripheral sounds are selectively amplified. Cao summarizes the functional advantage: “This might allow for faster reaction times and safer navigation in dynamic environments. It could also suggest that our auditory system is optimized for detecting novelty and deviation during movement.”
Key Questions Answered
A: Yes. In this study, neural responses to sound were stronger when participants walked compared with when they stood still or walked on the spot, indicating that locomotion increases auditory responsiveness.
A: Yes. Turning right or left altered how the brain responded to sounds presented to each ear. Early in a turn, responses to sounds from the direction of the turn were enhanced and later suppressed, which is consistent with transient shifts of spatial attention tied to movement.
A: The findings indicate that the auditory system dynamically filters sensory inputs during movement—reducing sensitivity to predictable self-generated sounds while boosting detection of unexpected events. This adaptive filtering likely supports faster reactions and safer navigation in everyday settings.
About this auditory processing and neuroscience research news
Author: SfN Media
Source: SfN
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Image: The image is credited to Neuroscience News
Original Research: The findings will appear in the Journal of Neuroscience