Summary: A large international replication study shows that people vary widely in their ability to detect sounds in noisy environments, and that this sensitivity is influenced by the sounds immediately preceding the target. By reproducing a decade-old experiment across 25 laboratories in 10 countries with 149 participants, researchers confirmed the original finding and clarified conditions that affect detectability in noise.
Sensitivity to a signal embedded in background noise differs substantially between individuals, and importantly, it depends on the acoustic context that comes just before the signal. These results help explain why some listeners find it far harder than others to follow conversations in noisy places such as cafés or busy streets.
Key findings:
- Substantial individual variation: People differ markedly in how well they detect signals in noise.
- Context-dependent perception: The immediately preceding sounds influence whether a later sound is detected.
- Clinical and diagnostic potential: The variability observed could inform hearing assessments and future therapeutic approaches.
Source: Northeastern University
Overview of the study
Led by Northeastern University professor Jonathan Peelle, this large-scale replication effort revisited a study published about ten years ago that originally reported context-dependent differences in auditory detection. The original experiment produced intriguing results but included data from only five participants who each completed lengthy testing. Peelle and an international team sought to test whether those effects would hold in a much larger, multi-lab sample and to better understand how listeners perceive speech and other signals in noisy settings.
To achieve this, the team coordinated 25 laboratories across 10 countries and recruited 149 participants. The replication followed the original study’s procedures closely: the researchers obtained the original sounds, code, and experimental details to ensure fidelity to the initial design. After confirming the stimuli and methods were implemented correctly, they ran the experiment across multiple sites to assess robustness and generalizability.
In the task participants completed across five sessions, listeners heard sequences of noise that changed in level before settling at a steady volume. A brief tone (a beep) was then either present or absent in each trial. Participants indicated whether they detected the beep. The experiment measured the point at which the beep became perceptible amid the background noise, and how that threshold changed depending on the immediately preceding acoustic context.
This simplified detection task models a core element of real-world listening: in a noisy café, for example, some words or syllables from a conversation may “break through” more easily than others. By isolating the basic perceptual mechanisms with a controlled beep-in-noise task, the researchers aimed to draw connections between fundamental auditory processing and everyday speech comprehension in noisy environments.
The replication confirmed the original effect: listeners’ detection thresholds shifted depending on the prior sound context, and there was meaningful variation across individuals. Some people showed strong context effects, while others showed much smaller or negligible effects. This individual variability could be valuable for clinical assessment—if reliable, it might be used as a diagnostic marker to identify people who are especially vulnerable to difficulties hearing in noisy settings.
Peelle noted that the project underscored the value of large-scale collaboration in auditory neuroscience. Bringing together 25 teams and coordinating 69 co-authors allowed the researchers to overcome replication challenges and produce a more definitive test of the original findings. The coordinated effort also helped identify methodological hurdles that had made earlier replication attempts difficult.
Publication and credits
Author: Erin Kayata
Source: Northeastern University
Contact: Erin Kayata – Northeastern University
Image: The image is credited to Neuroscience News
Original research: The replication findings will be published in Royal Society Open Science.