Set-shifting in children with autism spectrum disorders: reversal shifting deficits on the Intradimensional/Extradimensional Shift Test correlate with repetitive behaviors.

Lancioni et al. (2009) gave the ID/ED shift test to high-functioning kids with autism and to typical peers. The test asks children to switch sorting rules when the rules change. The team counted errors on each switch type and checked if errors tracked with repetitive behaviors.

All kids had IQ in the average range. The study used a quasi-experimental design: one group with ASD, one without.

Children with ASD made far more mistakes than peers on reversal shifts. A reversal shift keeps the same feature (like color) but swaps which color is correct. These extra errors predicted higher repetitive behavior scores.

Other shift types showed smaller or no group differences.

Hudry et al. (2013) also found that repetitive behaviors drive downstream problems. They showed child repetitive signs predict poorer parent-child play, again spotlighting these behaviors as a key lever.

Johnson et al. (2021) looked at a different cognitive marker—verbal IQ—and linked it to autism severity. Together the papers suggest both flexible thinking and language ability shape how autism looks, so no single score tells the whole story.

Rossow et al. (2021) tied sensory seeking to externalizing symptoms in preschoolers. Like E et al., they show that a specific processing style (set-shifting or sensory) maps onto a narrow symptom cluster rather than global severity.

If a child with ASD melts down when you flip reinforcement rules, the trouble may be cognitive inflexibility, not non-compliance. Probe for reversal-shift errors during tabletop tasks. Target flexible rule games in therapy and track whether repetitive behaviors ease as flexibility grows.