Rhythm of breathing affects memory and fear....

Scientists at the Northwestern University Feinberg School of Medicine have been looking into how breathing affects the brain neurons.  Neurons are the communicators in the brain.  We have 100 billion of them.  The breath is not just for oxygen, it also affects the brain function and so influences behavior.  This also influences emotional judgment and memory recall.  The scientists also found a relationship to inhalation and exhalation.  There is also a link to whether the person is using the mouth or nose.
In this study the nose won out, when mouth breathing was used there was no affect. If a person in the study was asked to find the difference between a fearful face and a surprised face, they could recognize the face better if there was an inhale.  This activity is linked to the amygdala, which is in charge of recognizing fear. 
When the subjects were asked to remember something, then the inhale won out again.  This process is linked to the hippocampus.

Come and try LENS neurofeedback.  It will help with these problems of fear and memory response.  Just remember to inhale when you want better results with understanding the brain.