Gestures Linked to Increased Postural Instability
New research shows that hand gestures during speech compete with balance control for neural resources.
Updated on Sept. 28, 2026 in Stroke
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Researchers found that adults exhibit increased postural sway when using co-speech gestures. The study suggests that speaking and gesturing compete for shared neural networks within the brain.
Why it matters
Understanding this cognitive trade-off provides insight into how the brain manages complex, simultaneous motor tasks. It highlights the physiological limits of neural networks when speech, gesture production, and balance control occur at once.
The study utilized a sample of 41 right-handed adults with an average age of 25.9 years to monitor postural sway. Researchers observed significant increases in sway during right-hand and egocentric gestures compared to other movement types.
The players
Broca's area
This is a region in the frontal lobe of the dominant hemisphere that is traditionally linked to speech production and language processing.
The details
Using wearable Inertial Measurement Units and functional near-infrared spectroscopy, the team identified increased activation in the left premotor and supplementary motor cortex during gesturing. Egocentric gestures specifically triggered higher activation levels in the frontal cortex and Broca's area.
Timeline
The findings were published in a peer-reviewed research article on September 28, 2026.
Deeper Dive
This study aligns with the dual-task interference paradigm in cognitive neuroscience. By documenting how gesturing competes for neural resources, the research extends current understanding of how the brain prioritizes competing motor and linguistic signals.
The findings suggest that individuals with existing balance issues or neurological vulnerabilities may need to be mindful of physical stability while multitasking during conversation. These results highlight how the brain must actively balance linguistic output with physical coordination.
The takeaway
Brain activity is a limited resource that requires the body to prioritize motor and communication tasks simultaneously. Being aware of these neurological trade-offs can help people better manage physical stability during complex social interactions.
Further reading
For more on the neurological impacts of movement and speech, visit our Stroke section.
More information
Access the full findings in the peer-reviewed research article published in Nature Scientific Reports.
Source note: This article includes information reported by Nature.
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