Binaural Frequency Modulation Detection in School-Age Children, Young Adults, and Older Adults: Effects of Interaural Modulator Phase.
Stacey G Kane, Emily Buss, John H Grose
PMID 33306546WHAT IT FOUND
Older adults and children struggled more than young adults to detect binaural frequency changes, especially in noise.
However, noise hurt children's ability to use these cues significantly more than it hurt older adults. This suggests different underlying mechanisms for hearing difficulties in development versus aging.
Key findings
01Older adults received less benefit from out-of-phase frequency modulation cues than young adults, indicating reduced sensitivity to binaural temporal fine structure.
02Adding masking noise reduced the benefit of binaural cues significantly more for young children than for older adults.
03FM detection thresholds improved with increasing age in children, suggesting central auditory maturation rather than peripheral deficits.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The sample size for young adults was small (n=11) compared to children (n=44). Children completed testing in either quiet or noise, not both, which limits direct within-subject comparisons for this group. The study used a specific low-frequency FM task; results may not generalize to other temporal processing tasks or higher frequencies. The mechanism for why noise disproportionately affects children's dichotic benefit remains unclear, with the authors offering competing hypotheses.
The easy way to misread this
Do not assume that older adults and children have similar auditory processing deficits because both perform worse than young adults. The study shows that noise impacts their ability to use binaural cues in opposite ways: children lose the benefit of these cues more drastically in noise than older adults do.