Sensory impairments and autism: a re-examination of causal modelling.

Gerrard et al. (2009) wrote a theory paper. They asked: could early ear, eye, skin, or balance problems start the chain that becomes autism?

The team mapped how tiny sensory glitches might snowball. Missed sounds could stall language. Odd touch could cut eye contact. Each step rewires the brain a little more.

They urged clinicians to stop treating sensory issues as side notes. Instead, view them as possible first dominoes in a child’s developmental line.

The paper does not give new data. It links hundreds of older studies into one story. The story says sensory trouble can come first, autism traits follow.

The authors predict different kids will show different sensory start points. One child may be deaf to voices. Another may be blind to faces. Both paths can land in the same diagnosis.

Ben-Sasson et al. (2019) pooled ten years of tests and found bigger sensory differences in autism than in typical kids. Their numbers back the theory’s claim that sensory signs are core, not extra.

Gonthier et al. (2016) went deeper. They tracked low-functioning adults and saw four clear sensory profiles. Each profile forecast its own behavior pattern, proving the model’s “one size does not fit all” idea.

Two papers seem to clash. Gallagher et al. (2003) and Dammeyer (2014) looked at deaf or deaf-blind children. They found autism-like behaviors even when classic autism was absent. This appears to break the causal chain, but the kids had congenital, total loss. The theory still holds for milder, partial sensory gaps that appear after birth.

You can screen for sensory red flags during intake. Ask about missed baby talk, food textures, or spinning objects. If you spot a pattern, build sensory breaks into language and social drills. Treat the ear or touch issue first, then rerun the lesson. Early relief may stop the cascade before it reaches core autism symptoms.