DPOAE growth function in schoolchildren with impaired temporal ordering skills.
Patricia Kimiko Kumagai, Seisse Gabriela Gandolfi Sanches, Renata Mota Mamede Carvallo
PMID 39936810WHAT IT FOUND
Children with impaired temporal ordering needed a louder sound to trigger a specific ear response at 2000 Hz.
Standard hearing tests and other frequencies showed no differences. This suggests subtle cochlear changes may exist in children with normal audiograms who struggle with sound sequencing.
Key findings
01The study group required a higher stimulus intensity to reach the Distortion Product Otoacoustic Emission (DPOAE) threshold at 2000 Hz compared to controls.
02The slope of the DPOAE growth curve was more linear at 2000 Hz in the study group, indicating reduced cochlear compression.
03No significant differences were found between groups in standard DPOAE responses or at frequencies other than 2000 Hz.
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 was very small (25 children). The study only assessed temporal ordering, not other aspects of auditory processing like resolution or integration. The findings were limited to a single frequency (2000 Hz), raising questions about whether this is a specific marker or a chance finding. The study design cannot prove that the cochlear changes caused the temporal ordering difficulties.
Declared interests
Funding was provided by FAPESP (2019/11961-8). No other conflicts of interest were declared.
The easy way to misread this
Do not assume that all children with auditory processing difficulties have cochlear damage. The differences were found only at one frequency in a small group, and standard hearing tests remained normal. This is a preliminary finding, not a diagnostic marker.