Do children with autism have a theory of mind? A non-verbal test of autism vs. specific language impairment.

Livia and colleagues built a picture-based false-belief task that needs almost no words.

They gave it to minimally verbal children with autism and to children with specific language impairment.

The goal was to see if theory-of-mind trouble lives only in autism, not in language delay alone.

Kids with autism failed the silent false-belief task far more often than kids with SLI.

Even when both groups had very few words, only the autism group missed what others might think.

The result points to a thinking difference, not just a talking difference.

Cramm et al. (2009) later showed that autistic children also struggle to spot their own false beliefs, extending the target’s other-focused task to the self.

Jolliffe et al. (1999) had already found theory-of-mind gaps in high-functioning adults using story questions; Livia’s non-verbal version proves the gap starts early and is not masked by language level.

Isaksson et al. (2019) seems to clash: in twin teens the autism–mind-reading link vanished once family factors were controlled. The difference is method — twins with shared genes versus singleton minimally verbal children — so both papers can be true.

You now have a quick, word-light probe that tells autism-specific social-cognitive delay from pure language delay. Use it during intake to decide whether to target perspective-taking or simply expand vocabulary.