Brief report: The effect of delayed matching to sample on stimulus over-selectivity.
Even a tiny gap between sample and choice makes kids focus on only one part of the picture.
01Research in Context
What this study did
Reed (2012) asked kids to play a matching game. First they saw a picture, then after a short wait they picked the same picture from a row.
Some kids had autism. Some were neurotypical. The wait was the only thing that changed.
What they found
The short wait hurt everyone. Kids focused on only one part of the picture instead of the whole thing.
Children with autism had the hardest time. Their over-selectivity jumped even higher.
How this fits with other research
Lantaya et al. (2018) found a fix. They dropped the wait and used a simple go/no-go task. College students formed stimulus classes without the extra hassle.
Leon et al. (2021) also kept timing tight. They played the sound first, then showed pictures right away. Five of six kids with autism learned faster.
The three studies line up: keep sample and comparison close in time. Delay hurts; immediacy helps.
Why it matters
When you run conditional-discrimination drills, place the sample and the choice cards side by side. If you must use tablets, set the delay to zero seconds. This small tweak can cut over-selectivity and speed up learning for kids with autism and typical peers alike.
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02At a glance
03Original abstract
Stimulus over-selectivity occurs when one aspect of the environment controls behavior at the expense of other equally salient aspects. Participants were trained on a match-to-sample (MTS) discrimination task. Levels of over-selectivity in a group of children (4-18 years) with Autism Spectrum Disorders (ASD) were compared with a mental-aged matched typically-developing group. There was more over-selectivity in the ASD group. When retention intervals were added between the sample and comparisons in the MTS task, both groups showed an increased level of over-selectivity, with the ASD group showing a more pronounced effect.
Journal of autism and developmental disorders, 2012 · doi:10.1007/s10803-011-1374-y