Temporal-sampling theory and language in Down syndrome: An empirical study.
Teens with Down syndrome hear word stress worse than same-IQ peers, and fixing this may lift their vocabulary.
01Research in Context
What this study did
Martínez-Castilla et al. (2024) tested 42 teens and young adults with Down syndrome. They also tested 42 peers with other intellectual disabilities who were the same age and had the same IQ.
Everyone listened to pairs of made-up words that differed only in stress. The team also gave a simple picture vocabulary test. They wanted to see if Down syndrome made stress hearing harder.
What they found
The Down syndrome group scored much lower on both tests. They missed more stress changes and knew fewer words.
Even when IQ was the same, Down syndrome still meant poorer scores. The gap fits the idea that Down syndrome brains sample sound more slowly.
How this fits with other research
Whitehouse et al. (2014) used fMRI and found weaker and oddly placed brain activation during story listening in Down syndrome. Pastora’s stress task gives a simple bedside version of that same problem.
H-Fournier et al. (2004) showed shorter sentence memory in Down syndrome versus mental-age peers. Pastora adds that the memory gap may start with hearing stress wrong in the first place.
Myers et al. (2018) tracked babies and said joint attention drives later language. Pastora shows that even in teens, the ear-brain link still drags language down, so both early social and later auditory work matter.
Why it matters
If a client with Down syndrome struggles to follow directions, first check if they hear stress patterns. Quick stress-discrimination drills take five minutes and can guide clearer speech targets or hearing referrals.
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02At a glance
03Original abstract
BACKGROUND: Temporal-sampling theory argues that difficulties in the processing of syllable stress auditory markers and in lexical stress discrimination contribute to explaining the language problems of children with developmental language disorder and of those with dyslexia. The theory has not been tested in other developmental disabilities. AIMS: This research sought to assess the potential of temporal-sampling theory as a framework to accounting for language difficulties in Down syndrome (DS). METHODS AND PROCEDURES: Thresholds for auditory markers of lexical stress, lexical stress discrimination, and receptive vocabulary were studied in teenagers and young adults with DS and in peers with other intellectual disability (ID) of unknown origin matched on chronological age and non-verbal cognition. OUTCOMES AND RESULTS: Frequency and intensity thresholds were higher in participants with DS, and their lexical stress discrimination and receptive vocabulary skills were lower than those of the group with other ID. Lexical stress discrimination was predicted by intensity thresholds and group, while receptive vocabulary was only predicted by lexical stress discrimination. CONCLUSIONS AND IMPLICATIONS: The results suggest that temporal-sampling theory is useful to explain language difficulties in individuals with DS or with other ID. This opens up new window opportunities for the design of language intervention programs in such populations.
Research in developmental disabilities, 2024 · doi:10.1016/j.ridd.2024.104856