Brain Activity in Noise: Study to Improve Hearing Aids & Public Spaces

Scientists are gaining a deeper understanding of how the brain processes speech in noisy environments, a discovery that could lead to more effective hearing aids and the design of public spaces that are more accessible to those with hearing difficulties. A novel study from the University of Stirling, published in eNeuro, used functional magnetic resonance imaging (fMRI) to examine brain activity while participants listened to engaging stories amidst background chatter. The findings suggest that even when speech is partially obscured by noise, the brain continues to actively engage with the narrative, adapting its processing strategies to maintain comprehension.

The research, led by Psychologist Dr. Aysha Motala, revealed a fascinating shift in brain activity as noise levels increased. While activity in auditory areas became more individualized, reflecting the unique challenges each person faced in deciphering the sounds, regions involved in attention and mental effort – specifically the cingulo-opercular network – showed more synchronized patterns across listeners. This suggests a common neural strategy for coping with challenging listening conditions. You can find more details about the study here.

How the Brain Prioritizes Storytelling

Interestingly, the study found that key brain regions responsible for tracking the structure and meaning of a story remained remarkably stable even with moderate noise. The researchers observed strong responses in the frontal, parietal, and medial cortices whenever a new section of the story began, indicating that the brain continued to segment and organize the narrative despite the distractions. This resilience in narrative processing is a key finding, suggesting that the brain prioritizes understanding the overall message even when individual words are difficult to discern.

Dr. Motala explained, “Our findings assist to clarify how the brain adapts to real-world noise. This has practical implications for society as understanding how listeners maintain narrative comprehension in noisy settings can inform the design of hearing aids and assistive listening devices.” The team hopes this research will shift the focus of assistive listening technology away from simply amplifying sound and towards supporting higher-level comprehension.

This isn’t the first time researchers have explored the brain’s response to auditory stimuli. A related study, published in 1995, investigated cognitive brain potentials and regional cerebral blood flow during auditory ‘oddball’ tasks, finding activation in areas like the left medial frontal and right posterior temporal cortex as detailed on the University of Stirling website. While the methodologies differ, both studies highlight the complex neural processes involved in auditory perception and cognitive engagement.

Implications for Assistive Technology and Public Space Design

The implications of this research extend beyond individual hearing aids. The findings could also inform the design of public spaces, educational environments, and even virtual communication platforms. By understanding how noise impacts cognitive load and intelligibility, architects and designers can create environments that minimize distractions and promote clearer communication. This could involve strategic use of sound-absorbing materials, optimized room acoustics, and thoughtful spatial layouts.

Current neuroscience research often takes place in ideal listening environments, which don’t reflect the realities of everyday life. This study’s focus on realistic noise conditions is a significant step towards bridging the gap between laboratory findings and real-world applications. The researchers acknowledge that further investigation is needed to fully understand the nuances of auditory processing in complex environments.

Another study explored the correlation between cortical activation and stimulus level using functional near-infrared spectroscopy (fNIRS), finding a positive correlation in the left superior temporal gyrus for both individuals with normal hearing and those with cochlear implants according to research published in PubMed. This reinforces the importance of considering stimulus level when designing auditory technologies and assessing listening comprehension.

Distinct Neural Systems at Play

The study also revealed distinct neural systems involved in naturalistic speech listening. Despite the increased activity in the cingulo-opercular network – the brain’s effortful attention center – participants continued to make sense of the stories, even when words were masked by background sounds. This suggests that the brain employs a flexible strategy, relying on contextual cues and prior knowledge to fill in the gaps and maintain comprehension.

Dr. Motala emphasizes that this research helps “bridge laboratory neuroscience with everyday listening challenges, supporting technologies and policies that make communication more accessible and cognitively sustainable.” The team’s work underscores the importance of considering the cognitive demands of listening, not just the acoustic clarity of the signal.

What’s Next: Refining Assistive Listening Devices

The University of Stirling team is now focused on translating these findings into practical applications. They are exploring ways to incorporate these insights into the design of assistive listening devices, with a particular emphasis on enhancing higher-level comprehension rather than solely focusing on amplifying sound. This could involve developing algorithms that prioritize the extraction of meaningful information from noisy signals or creating devices that provide contextual cues to aid in understanding. Further research will also investigate individual differences in auditory processing and how these differences can be accounted for in personalized assistive technologies.

Publication details: Björn Herrmann et al, Neural Signatures of Engagement and Event Segmentation during Story Listening in Background Noise, eNeuro (2026). DOI: 10.1523/eneuro.0385-25.2025

Journal information: eNeuro