"It's something that's repetitive and soothing but even in the latest Diagnostic and Statistical Manual of Mental Disorders [DSM 5 by the American Psychiatric Association], the 'psychiatric Bible', these sorts of behaviours are classified as purposeless," says Steven Kapp, a developmental psychologist at the University of Portsmouth who was diagnosed with autism aged 13. "So, I think a lot of researchers have struggled to understand why people engage in these behaviours."

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