Spatial-simultaneous and spatial-sequential working memory in individuals with Down syndrome: the effect of configuration.
People with Down syndrome find it hard to hold a whole visual scene in mind at once, so present visuals piece-by-piece.
01Research in Context
What this study did
Carretti et al. (2013) tested two kinds of visuospatial working memory in people with Down syndrome. One task showed all dots at once (simultaneous). The other showed dots one after another (sequential).
Both groups saw the same dot patterns. Some patterns made shapes. Others were random. The team asked: who uses the pattern to remember better?
What they found
People with Down syndrome did not use the helpful shapes on the all-at-once task. Their scores stayed low even when the dots formed a clear picture.
On the one-by-one task, the Down syndrome group kept up with mental-age peers. The pattern shape did not matter here for either group.
How this fits with other research
Bailey et al. (2010) ran a similar test three years earlier. They saw small gains when patterns were added. The new study shows the gain disappears on simultaneous tasks, sharpening the picture.
Lanfranchi et al. (2015) gave the same two tasks to people with Williams syndrome. They also stumbled on simultaneous but not sequential trials. The pattern now spans two genetic disorders.
Cardillo et al. (2022) looked at autism and found the opposite link. Typical kids used simultaneous memory for a complex drawing; autistic kids leaned on sequential. Down syndrome data line up with autism, not typical peers, on simultaneous load.
Why it matters
When you show a visual schedule, social story, or matching board, break it into small steps shown one at a time. Keep the full array short if you must display it all at once. Check understanding after each step instead of asking the client to hold the whole picture in mind. These tiny design choices match how Down syndrome memory actually works.
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02At a glance
03Original abstract
Earlier research showed that visuospatial working memory (VSWM) is better preserved in Down syndrome (DS) than verbal WM. Some differences emerged, however, when VSWM performance was broken down into its various components, and more recent studies revealed that the spatial-simultaneous component of VSWM is more impaired than the spatial-sequential one. The difficulty of managing more than one item at a time is also evident when the information to be recalled is structured. To further analyze this issue, we investigated the advantage of material being structured in spatial-simultaneous and spatial-sequential tasks by comparing the performance of a group of individuals with DS and a group of typically-developing children matched for mental age. Both groups were presented with VSWM tasks in which both the presentation format (simultaneous vs. sequential) and the type of configuration (pattern vs. random) were manipulated. Findings indicated that individuals with DS took less advantage of the pattern configuration in the spatial-simultaneous task than TD children; in contrast, the two groups' performance did not differ in the pattern configuration of the spatial-sequential task. Taken together, these results confirmed difficulties relating to the spatial-simultaneous component of VSWM in individuals with DS, supporting the importance of distinguishing between different components within this system. The findings are discussed in terms of factors influencing this specific deficit.
Research in developmental disabilities, 2013 · doi:10.1016/j.ridd.2012.09.011