Adaptation to Noise in Spectrotemporal Modulation Detection and Word Recognition.
David López-Ramos, Miriam I Marrufo-Pérez, Almudena Eustaquio-Martín and 2 others
PMID 39267369WHAT IT FOUND
Delaying speech by 800 ms after noise onset helped normal-hearing listeners hear vocoded words better, but not natural words.
This improvement matched gains in detecting separate spectral or temporal cues, yet not combined spectrotemporal cues.
Key findings
01Adaptation to noise (delaying the target) significantly improved detection of spectral modulation and temporal modulation, but not spectrotemporal modulation.
02Speech reception thresholds improved significantly in the late condition for vocoded words, but not for natural words.
03The magnitude of adaptation was significantly less for natural words (0.59 dB) than for vocoded words (2.1 dB).
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study used only normal-hearing adults, so results may not generalize to hearing-impaired populations. Modulation detection was tested at only one specific temporal frequency (10 Hz) and spectral density (2 cycles/octave). Different methods were used for word recognition (varying SNR) and modulation detection (fixed SNR), making direct comparison difficult. The study did not investigate transient speech cues, which are important for natural speech perception.
Declared interests
The authors report no conflicting interests. Funding was provided by Banco Santander, Ministerio de Ciencia e Innovación, European Regional Development Fund, Ministerio de Universidades, and Universidad de Salamanca.
The easy way to misread this
Do not assume that delaying speech onset in noise will significantly improve recognition of natural speech for normal-hearing listeners; the study found this benefit was statistically significant only for vocoded words.