A study in the US National Library of Medicine found that cyclical nasal breathing influences cognitive function, specifically tasks performed by the hippocampus (which is responsible for processing and storing short-term memory) and the amygdala (which regulates emotions and moods). While nasal breathing is linked to better memory recall and lower levels of depression and anxiety, mouth breathing diminishes control over these functions.
Researchers believe the link between nasal breathing and cognitive function has something to do with our sense of smell, processed in the piriform cortex, which evolved as a survival sense. But the effects of breathing through your nose extend beyond just smell: even when no discernable scent is present, the simple process of nasal breathing keeps these three parts of the brain activated, contributing to consistent sharper memory formation and recall.
Follow the link below to read the study: