Hearing abilities of Down syndrome and other mentally handicapped adolescents.
Down syndrome clients often have hidden hearing loss that mimics cognitive delay—screen ears before you blame the brain.
01Research in Context
What this study did
The team compared hearing in teens and young adults with Down syndrome to peers with other intellectual disabilities. They used ear exams, hearing tests, and a timed word game with background noise.
All participants had similar IQ and age ranges. The goal was to see if Down syndrome adds extra hearing risk beyond general ID.
What they found
The Down syndrome group had worse high-tone hearing and more middle-ear fluid. They also needed longer to name words when noise was playing.
These gaps showed up even though both groups had the same cognitive scores. Poor hearing, not low IQ, was slowing their responses.
How this fits with other research
Evenhuis (1995) followed the same questions into older adults and found the pattern continues: moderate-severe losses stay common past age 65. The 1992 teen data and the 1995 senior data line up to show a lifelong risk.
Smith et al. (2020) zoomed out to over 600 Irish adults with ID. They linked Down syndrome to broad communication problems, matching the hearing bottleneck spotted here.
O'Hearn et al. (2011) looked at kids and blamed phonological working memory for language delays. Together the papers map two lanes: sensory (hearing) and cognitive (storage) both choke word learning, so you need to test both before picking an intervention.
Why it matters
If a client with Down syndrome seems slow to follow directions, check ears first. A ten-minute hearing screen can spare months of wrong targets and frustration. When loss is found, refer for wax removal, tubes, or aids, then re-test language with clear signals. Treating the ears often unlocks faster progress than drilling more trials.
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02At a glance
03Original abstract
Down syndrome (DS) individuals are prone to auditory processing difficulties in a variety of audiological, short-term memory, and language tasks. The present study explored: (a) the hearing capabilities of DS adolescents and young adults relative to a sample of non-DS mentally handicapped (MH) individuals, and (b) the relationship between hearing ability and performance on several cognitive tasks. Samples of 26 DS and 26 MH trainable mentally handicapped individuals were matched on IQ and chronological age (CA). Audiometric data revealed greater hearing losses in DS than in MH individuals at five of the six tested frequencies, more DS conductive and mixed hearing losses, and particularly high DS losses in the high-frequency range. Measurement of the speech reception threshold revealed poorer reception of speech by the DS than the MH group. Classification of tympanograms indicated fewer normal ears and twice as many DS ears with middle ear problems reflecting no mobility or retraction of the tympanic membrane. Presence of DS middle ear difficulties was also confirmed by poorer elicitation of the acoustic (stapedius) reflex in DS subjects. Correlation of hearing variables with seven cognitive tasks administered on the same day revealed only one significant relationship after the statistical removal of the effects of CA and IQ: DS subjects with poorer hearing identified fewer words in a task in which a masking noise quickly followed a spoken word. This result suggests that group findings of DS auditory-verbal processing difficulties stem, in part, from subjects with hearing difficulties needing more time to identify spoken words.
Research in developmental disabilities, 1992 · doi:10.1016/0891-4222(92)90048-b