ASMR: How sound is being used as a stress reliever

You may not have heard about ASMR but type it into a search engine and you get more than 11 million responses, many of them videos.

They are designed for relaxation and for many viewers can cause a distinctive and pleasurable tingling sensation in the head.

Scientists are now investigating the phenomenon of Autonomous Sensory Meridian Response in more depth, as Nick Higham reports.

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