For children with autism spectrum disorder and with an intellectual disability, the options for improving communication and social skills are limited.

Talking therapies and behavioural programmes can help some children develop these skills, but they depend on specialists who are in short supply – even in wealthy countries.

Around 30-35% of autistic children have an intellectual disability, according to research from the US. They are less likely to get treatment than those without one (in part because doctors lack confidence managing their needs and insurance coverage for intellectual disability is patchy) despite having greater needs and placing heavier demands on their families. It is a group that researchers often overlook.

That gap motivated us to test a different kind of intervention: using brief, targeted magnetic pulses to stimulate specific parts of the brain. The technique, known as non-invasive brain stimulation or neuromodulation, involves no surgery, no anaesthetic and no drugs.

A device held close to........

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