It's not just your body that needs to be 'worked out'. Your brain also needs training to stay young and fit.

A digital brain exercise, developed by the American biotech company Posit Science Corporation , has been put to the test by neurologists at McGill University in Canada, with some promising results.

In a rigorous, double-blinded controlled trial, 82 healthy adults over the age of 65 were randomly assigned to play either Posit's 'BrainHQ' app or a recreational computer game for thirty minutes a day.

After 10 weeks, brain scans revealed that those who played BrainHQ, which focused on speed-based challenges, showed measurable increases in cholinergic activity, a type of brain signalling .

This was seen in a part of their brain known as the anterior cingulate cortex (ACC) –

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