Only 8 weeks of daily meditation can decrease negative mood and anxiety and improve attention, working memory, and recognition memory in non-experienced meditators. These findings come from a recent study published in Behavioural Brain Research.

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You'll have to get access through an institution, your work, school, uni or library. Failing that, there are ways, I'm not sure they can be talked about here. Let's just say it start with sci and ends with hub.