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Previous research has shown that new, working memories are stored transiently by neural circuits in one part of the brain and then encoded as long-term memories stored in circuits in another part of the brain. Electrically stimulating these parts of the brain might improve memory formation, but evidence in previous studies has been mixed.
A group from Boston University hypothesized that repetitive transcranial alternating current stimulation of these two brain areas with specific electrical frequencies might improve these two types of memory. The researchers administered transcranial alternating current stimulation for 20 minutes on 4 consecutive days to 150 older people (age range, 65–88) without known neurological or psychiatric disorders.…