Stimulus Overselectivity in Autism, Down Syndrome, and Typical Development.

Vassos et al. (2016) tested whether kids with autism notice fewer cues than other kids. They ran a quasi-experiment with three groups: autism, Down syndrome, and typical kids. All kids were matched for mental age so the groups had similar thinking skills.

They used matching-to-sample tasks to see who picked only one cue instead of all relevant ones. The goal was to learn if overselectivity is truly an autism-only problem.

When kids were matched for cognitive level, no group showed more overselectivity than the others. Autism kids, Down kids, and typical kids all narrowed their attention about the same amount.

The study says the label 'autism' does not predict narrow stimulus control. Intellectual level, not diagnosis, links to how many cues a child uses.

Ploog (2010) claimed overselectivity is a core autism trait and needs ABA fixes. Vassos et al. (2016) do not reject that view; they simply show the trait shows up only when autism also comes with lower mental age.

Cox et al. (2015) found just 19 % of autism kids were overselective. V et al. match those kids for ability and now see zero group difference, suggesting the earlier 19 % were the lower-functioning subset.

McGeown et al. (2013) saw typical toddlers under 36 months act overselective. V et al. extend that idea: once any child reaches the same mental age, narrow attending fades no matter the diagnosis.

Stop blaming autism alone when a learner locks onto one cue. Check mental age first, then add broadening tactics like multiple-exemplar training or stimulus control shaping. These tools help all kids who think at a younger level, not just the autism group. Match tasks to cognitive age, not calendar age, and you will see wider attention across labels.