Electrophysiological Responses to Spectral Ripple Envelope Phase Inversion in 3-Month-Olds and Adults.
Talat Jabeen, David Horn, Mark W Pettet and 3 others
PMID 41077645WHAT IT FOUND
In 3-month-olds and adults, the acoustic change complex was detected in response to the 1 ripple-per-octave change but rarely to the 8 ripple-per-octave change.
This supports it as a possible objective probe of infant auditory discrimination.
Key findings
01The acoustic change complex was elicited in the 1 ripple-per-octave condition but not in the 8 ripple-per-octave condition at group level for both infants and adults.
02For infants, an acoustic change complex was detected in 13 of 16 in the 1 condition and in 1 of 16 in the 8 condition; for adults, it was detected in 8 of 11 in the 1 condition and in none in the 8 condition.
03Onset responses were detected in all adults and in all but one infant in both conditions.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
Only two ripple conditions were tested, so the study cannot show how the response changes near threshold. Behavioral thresholds were not measured in these participants, so the EEG result was compared only with prior behavioral work. Eight infants were excluded because of sleep, fussiness, movement, or experimental error. No auditory brainstem responses were recorded, so auditory neuropathy spectrum disorder was not ruled out. The infants had typical hearing and were not using hearing aids or cochlear implants. The analysed sample was small: 16 infants and 11 adults. Some infants had fewer usable trials, and the minimum number of trials was not determined. Automatic peak detection failed for two participants, so detection parameters may need refinement.
The easy way to misread this
Do not read the 1 ripple-per-octave result as proof that the acoustic change complex can establish an infant discrimination threshold. The study tested only two conditions in 16 analysed infants and did not obtain behavioral thresholds.