Dis/Associations Between Language and In-the-Moment Mental Rotation Effort in Autism.
Strong grammar predicts harder mental-rotation effort in autistic adults, the reverse of neurotypical peers.
01Research in Context
What this study did
Emerson et al. (2025) watched pupils while autistic and neurotypical adults spun 3-D shapes in their heads.
They also gave everyone a quick grammar test.
The goal: see if better language links to easier mental effort in each group.
What they found
Both groups’ pupils grew the same amount during the task, so total effort looked equal.
Yet good grammar predicted smoother, smaller pupil changes in neurotypical adults.
In autistic adults the pattern flipped: stronger grammar went with bigger, less efficient pupil swings.
How this fits with other research
Bled et al. (2024) found autistic adults can rotate and hold images as well as, or better than, peers.
Caroline’s pupillometry now shows that this equal performance hides unequal effort costs when language skill is high.
Ring et al. (2020) saw no pupil “old/new” memory effect in autism; Caroline adds that pupils also reveal a grammar–cognition split.
Nevin et al. (2005) showed autistic kids’ brain waves respond weakly to word meaning; the new data suggest this language gap still shapes effort in adulthood.
Why it matters
If a client has strong grammar, don’t assume verbal strength will lighten the load on visual tasks.
Watch for hidden strain: longer pauses, gaze aversion, or rising self-talk during puzzles.
Offer non-verbal supports—gesture, models, or breaks—so language skill doesn’t accidentally tax the visuospatial system.
Want CEUs on This Topic?
The ABA Clubhouse has 60+ free CEUs — live every Wednesday. Ethics, supervision & clinical topics.
Join Free →During block-design or puzzle tasks, note pupil size changes and give visual demos instead of extra verbal hints.
02At a glance
03Original abstract
In-the-moment dissociations between language and visuospatial systems in autism spectrum disorder (ASD) may explain notable heterogeneity observed in both language and visuospatial skills. The current study used pupillometry, a physiological measure of in-the-moment cognitive effort, during a mental rotation task to examine associations between structural language and visuospatial cognition. Participants were 25 children and young adults with ASD and 25 age- and IQ-matched neurotypical (NT) peers. The mental rotation task involved four conditions: two- and three-dimensional figures, and two- and three-dimensional objects. We measured structural language using the grammar subscale from the Test of Language Development: Intermediate. Growth-curve mixed-effects model results indicated no overall group differences in average pupil dilation or the time course of cognitive effort. Group differences were evident in the association between grammar skills and latency of cognitive effort for stimuli in the objects, 3D, and, more narrowly, 3D objects conditions. Autistic individuals with relatively better grammar skills deployed cognitive effort less efficiently, whereas, NT individuals with relatively better grammar skills deployed cognitive effort more efficiently. These findings suggest that language and visuospatial systems are more dissociated in autistic individuals than in NT peers. This work underscores the importance of examining the time course of how language and cognition interact in ASD.
Autism research : official journal of the International Society for Autism Research, 2025 · doi:10.1002/aur.70101