keep in mind this MIT article was back in 2010 and LIFE EXTENSION is in the business of selling supplements.
and this was tested only in rats.

here's the article the LEF article cites, not much there.
http://www.mit.edu/press/2010/magnesium-supplement.html


For Immediate Release: January 27, 2010
contact: Jen Hirsch, MIT News Office
email: newsoffice@mit.edu phone: 617-253-2700

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Magnesium supplement helps boost brainpower
CAMBRIDGE, Mass. — Neuroscientists at MIT and Tsinghua University in Beijing show that increasing brain magnesium with a new compound enhanced learning abilities, working memory, and short- and long-term memory in rats. The dietary supplement also boosted older rats’ ability to perform a variety of learning tests.