Electrodermal activity to auditory stimuli in autistic, retarded, and normal children.

The team wired kids to skin sensors and played tones. They watched how sweaty palms changed after each beep.

Three groups sat the same test: autistic kids, kids with intellectual disability, and typical kids. All were matched for mental age.

Across the whole group, autistic kids showed a different sweat pattern. Yet one autistic child could look just like one typical child.

The overlap was big. Skin response alone could not sort one kid from another.

Redquest et al. (2021) later found the same task in adults. They saw slower sweat drop-off in autistic people, giving a clearer marker. The adult study used more tones and added brain scans, showing the habituation gap the 1984 paper only hinted at.

Dube et al. (1991) kept the three-group design but swapped skin sweat for brain-stem clicks. They found longer nerve travel time in autism, again showing group-level difference but wide overlap.

Herrnstein et al. (1979) did the same trio comparison with fingerprint ridges. Like sweat, ridges differed on average but mixed at the individual level. Together these papers say: body signals can flag risk, not rule it in or out.

Do not trust a single biosensor score as proof of autism. Use skin-conductance or EEG only as one data point beside behavior and history. When you test sensory tools, run many trials and look for habituation slope, not just one big response. Share overlap data with families so they know biology is messy, not a yes-or-no stamp.