Here is an article in The Guardian that discusses some of the many myths concerning brain exercises:
An award-winning Scottish professor says measures such as breathing through the left nostril, drinking water to increase oxygen supply to the brain, drinking red wine to fend off dementia or listening to classical music to boost performance are little more than myths.
He’s particularly critical of exercises taught to children as a means of enhancing performance that have no bearing on how the brain works. And while these myths are started in a variety of ways, from a misunderstanding, to an innocent prank, to deliberate misinformation with commercial reasons in mind, given how widespread these myths are, it speaks volumes about the lack of critical thinking skills being taught:
‘Despite how ridiculous many of these exercises are, this is no laughing matter,’ argued Della Sala. ‘Some of the exercises are so simplistic you wonder whether we have lost our capacity for critical thinking when it comes to education. One of the exercises involves asking kids to breathe through the left nostril so that the air goes up into the right hemisphere and stimulates the right side of the brain to make the kid more creative,’ he said.
‘A tiny problem in this thinking is that air goes down to the lungs rather than up to the brain. So I think it is safe to say that you can’t stimulate the right side of your brain by breathing through your nostril. Besides the idea that the right side of the brain is the creative side is utter nonsense.’