How do different hearing tests relate to our brain and daily life?
Tests using complex sentences in modulated noise depend more on attention and mental processing, while tests that vary background noise levels align best with how people subjectively experience their own hearing challenges.
Source
The relationship of speech intelligibility with hearing sensitivity, cognition, and perceived hearing difficulties varies for different speech perception tests
What they did
Researchers analyzed baseline data from 44 adults aged 50 to 74 with mild hearing loss to understand how cognitive abilities and self-reported daily hearing struggles relate to physical hearing test performance. Participants completed a battery of seven cognitive tests measuring attention and memory, alongside four speech-in-noise tests of varying complexity, including phonemes in quiet, digits in steady noise, and sentences in fluctuating noise. Self-reported quality of life and hearing-related difficulties were also measured using several standard questionnaires.
What they found
Performance on the complex sentence-in-noise test was predicted by attentional cognitive scores and hearing sensitivity, whereas performance on the simpler digit-in-noise tests was predicted only by hearing sensitivity. Additionally, changing the volume of the background noise in digit tests, rather than changing the volume of the speech, yielded scores that matched much more closely with participants' subjective daily communication struggles. General quality of life measures did not correlate with any speech perception outcomes, though hearing-specific questionnaires did.
The limits
What it doesn't show
Because this study utilized baseline data from a small sample of 44 adults with mild hearing loss who did not wear hearing aids, the findings may not generalize to people with more severe hearing loss or those who use hearing aids. Additionally, the correlational nature of the design means we cannot conclude that better attention directly causes better sentence comprehension in noise. Finally, the study was not fully counterbalanced to systematically untangle whether the target speech complexity or the background noise type drove the cognitive differences.
Key terms
- Working memory
- The cognitive system responsible for temporarily holding and processing information in our minds.
- Signal-to-noise ratio
- The ratio of the volume of the target speech to the volume of the background noise.
- Speech reception threshold
- The signal-to-noise ratio at which a listener can correctly identify a certain percentage of spoken words or sentences.
- Sensorineural hearing loss
- Hearing loss caused by damage to the inner ear or the nerve pathways from the inner ear to the brain.
- Active listening
- A cognitive process that requires mental effort, attention, and working memory to decode spoken language, particularly in challenging environments.
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Quiz yourself
How does the World Health Organization's ICF framework conceptualize hearing, listening, and communication?
Common questions
Why does varying the background noise level relate more to real-world surveys than varying speech levels?
Varying the noise mimics daily challenges where the speaker's voice is constant but environmental noise fluctuates. This setup captures a person's psychological tolerance for annoying background noise, which matches the subjective difficulties they report in surveys.
Does aging itself explain the decrease in speech-in-noise performance in this study?
No, the researchers found no significant correlation between age and any of the speech perception tests, likely because the participant group was restricted to a relatively narrow older age range of 50 to 74.
Which cognitive skill is most critical for understanding complex sentences in noisy rooms?
According to the study's regression models, focused and divided attention, along with non-verbal intelligence, were the most significant cognitive predictors of success on the complex sentence test.
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