Sorting preference in children with autism: the dominance of concrete features.

Ropar et al. (2007) watched autistic and neurotypical kids sort picture cards.

The kids could group by color or size (concrete) or by category like food vs toys (abstract).

No one told them which way to sort; the researchers just recorded their picks.

Almost every autistic child stacked the cards by color or size even when category grouping gave a tidier set.

The neurotypical kids quickly switched to category piles when they noticed it worked better.

The study labels this a negative finding: the concrete rule stayed stuck.

Ahlborn et al. (2008) seems to disagree at first glance. Two-thirds of their high-functioning autistic sample did use abstract, prototype-style piles. The key difference is task clarity: J et al. gave extra cues and clearer rules, showing the concrete bias is not locked in for every child.

Snape et al. (2018) extends the story. They tried to teach new categories with lots of examples, hoping multiple exemplars would nudge autistic kids toward abstract rules. It did not help, confirming that the concrete-first habit is hard to shift even with special instruction.

May et al. (2015) used the same autistic-vs-neurotypical design but looked at anxious attention instead of sorting. Both papers find group differences that trace back to how information is filtered, not a simple deficit.

If you hand an autistic learner a pile of stimuli, expect them to latch onto color, size, or shape first. State the category rule out loud, model it, and reinforce correct category matches before assuming they see it. When progress stalls, simplify the abstract rule or add visual cues instead of adding more exemplars; Snape et al. (2018) shows extra examples alone will not close the gap.