Movement patterns that are imperceptible to the human eye but that are present in children with autism spectrum disorders (ASD) and their parents may provide a clue to the disorder’s severity, new research suggest.

“We found speed fluctuations at millisecond time scale that could serve as a quantitative biomarker for ASD,” study investigator Di Wu, a PhD graduate student at Indiana University Bloomington, told Medscape Medical News.

The researchers have developed a quantitative way to assess these otherwise ignored variations in movement.

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