Dr Dougal said that the helmet “may well help dying brain cells regenerate into functioning units once again”.
He said: “Much more research is needed to fully understand the mechanism of action.”
Tracy Sloan, 56, was one of the healthy test subjects who was given the helmet to improve her memory.
She said the helmet did improve in her daily life after she wore it for six minutes at a time in the morning and night for a period lasting over three months.
She said: “I have a bad memory to start with and I think as you get older it gets no better, so I thought I would give the therapy a go.
“I wasn’t sure it would make a difference, but to be honest I think it did.
“After a few weeks I noticed that my sleeping pattern was better, I felt more relaxed and I had more energy.”
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