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Emotional Intelligence 2.0 said that breathing deeply and slowly increases mental performance, but I couldn't find any studies that really study the claim, and the book is a self-help book, which tend to be extremely unrigorous. So, does it increase mental performance?

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  • $\begingroup$ Increase mental performance at what? $\endgroup$ Mar 21, 2015 at 19:55
  • $\begingroup$ @ChristianHummeluhr Anything at all. $\endgroup$
    – Kelmikra
    Mar 22, 2015 at 2:11
  • $\begingroup$ @Kyth'Py1k: maybe see if it adds more oxygen to the blood and brain, then see if more oxygen to the blood and brain increase mental performance...? Also, you need to define mental performance; i.e. staying calm in stressful situations vs. creativity levels... $\endgroup$ Aug 1, 2015 at 7:00
  • $\begingroup$ @GregMcNulty Like I said before, by mental performance, I mean performance in any mental activity in any way. $\endgroup$
    – Kelmikra
    Aug 1, 2015 at 11:35

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I spent some time searching various databases with a variety of different keywords related to breathing techniques and mental outcomes. I only found a couple of studies that have looked at certain Yoga deep breathing techniques and their effects on cognitive tests measuring attention/concentration (Shirley Telles et al. 2007, 2013). Some of these specific techniques (such as selective or alternate nostril breathing) seemed to lead to better performance as compared to control groups (e.g., only breathing awareness).

I have to admit that I am a bit skeptical because the studies have small samples and placebo effects may have played a role.

In conclusion, there does not seem to be much research that would allow the strong and general claim the self-help book is making.

References

Shirley Telles, P. Raghuraj, Satyapriya Maharana, and H. R. Nagendra (2007) immediate effect of three yoga breathing techniques on performance on a letter-cancellation task. Perceptual and motor skills: volume 104, issue , pp. 1289-1296.

Shirley Telles, Arti Yadav, Ram Kumar Gupta, and Acharya Balkrishna (2013) Reaction Time Following Yoga Bellows-Type Breathing and Breath Awareness. Perceptual and Motor Skills: Volume 117, Issue , pp. 89-98. doi: 10.2466/22.25.PMS.117x10z4

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