Rule-based category learning in Down syndrome.
Expect shorter backward memory spans in teens with Down syndrome even when mental age is matched.
01Research in Context
What this study did
Phillips et al. (2014) asked teens with Down syndrome to repeat short lists of words and point to blocks in reverse order.
They compared the scores to kids of the same mental age without Down syndrome.
The goal was to see if the teens with Down syndrome had extra memory problems beyond what their mental age predicted.
What they found
The Down syndrome group scored lower on both the word and the block tasks.
Even when mental age was matched, their backward spans were shorter.
This points to a Down-syndrome-specific memory gap, not just slower development.
How this fits with other research
Carretti et al. (2013) saw the same pattern for spatial memory. They found that holding several places in mind at once was harder for Down syndrome learners than for mental-age peers.
Bailey et al. (2010) showed that giving the pictures a clear pattern helped a little, but the gap stayed. Allyson’s 2014 data confirm the gap is still there when the task is reversed recall.
Pino et al. (2017) offer a bright spot: adding a simple sketch map while giving directions improved landmark learning. So the deficit is real, but outside visual aids can soften it.
Why it matters
When you test or teach a client with Down syndrome, plan for shorter backward spans. Break long instructions into forward chunks or add visual scaffolds like the sketch maps Chiara used. This keeps tasks doable and cuts frustration.
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02At a glance
03Original abstract
The present study was designed to investigate verbal and spatial short-term memory abilities in persons with Down's syndrome (DS) and intellectual disability (ID) of different aetiology. For this purpose, we compared performances of DS (n = 15; mean mental age = 5.2 years; SD = 1.2 years; mean chronological age = 16.6 years; SD = 2.9 years) and ID subjects (n = 14; mean mental age = 5.8 years; SD = 2.1 years; mean chronological age = 16.4 years; SD = 2.5 years) with those of normally developed subjects matched for mental age (n = 24) on tasks of forward and backward immediate recall of verbal and spatial sequences. Our results are discussed in the light of the Working Memory model developed by Baddeley (1986, 1990). Altogether, our data documents a deficit of verbal and spatial backward spans in persons with DS. The deficit seems to be specific for this particular aetiology group, confirming the hypothesis that ID is not a uniform condition, characterized by an undifferentiated delay of the cognitive development, but rather that it is characterized by a deficit in a complex cognitive system in which some cognitive abilities can be disrupted more than others (Detterman 1987; Vicari et al. 1992).
American journal on intellectual and developmental disabilities, 2014 · doi:10.1111/j.1365-2788.1995.tb00574.x