Inhaling stimulates the brain, study finds
Take a deep breath through your nose to boost your recall
Taking a big breath when trying to remember could be a simple way to boost recall, scientists believe, after finding that inhaling stimulates the brain.
U.S. researchers discovered that the rhythm of the breath creates electrical activity in the brain where emotions, memory and smells are processed.
In experiments, individuals were able to identify a face two seconds more quickly if they encountered it when breathing in through the nose, compared to breathing out. They were also more likely to remember an object if they encountered it on the inhaled breath rather than the exhaled one.
But the effect disappeared if breathing was through the mouth.
“One of the major findings in this study is that there is a dramatic difference in brain activity during inhalation compared with exhalation,” said lead author Christina Zelano, assistant professor of neurology at Northwestern University Feinberg School of Medicine in Chicago. “When you breathe in, we discovered you are stimulating neurons in the olfactory cortex, amygdala and hippocampus, all across the limbic system (which controls instinct and mood).
“When you inhale, you are in a sense synchronizing brain oscillations across the limbic network.”
The scientists initially noticed the differences in brain activity while studying seven patients with epilepsy who were scheduled for brain surgery. Before surgery, a surgeon implanted electrodes into the patients’ brains in order to identify the origin of their seizures. It also allowed scientists to acquire electro-physiological data directly from their brains. They discovered that their brain activity fluctuated with breathing.
In a broader experiment, 60 volunteers were shown pictures of faces with a fearful or surprised expression, and reaction times tested. The same subjects were also shown pictures of objects on a computer screen and told to remember them. “If you are in a panic state, you spend proportionally more time inhaling,” Zelano said. “Our body’s innate response to fear with faster breathing could have a positive impact on brain function and result in faster response times.”
The study is published in the Journal of Neuroscience.