Researchers identify nose-to-brain circuit linking breathing and anxiety

Researchers have identified a “nose-to-brain circuit” that connects sensory neurons in the nasal cavity directly to brain regions responsible for anxiety. A study published in the Proceedings of the National Academy of Sciences suggests this pathway is sensitive to breathing speed, explaining why rapid or slow nasal breathing can influence emotional states.

Complementary research highlights the physiological impact of deep breathing on aggression and stress. Controlled breathing activates the parasympathetic nervous system and stimulates the vagus nerve, which acts as a biological brake on the body’s fight-or-flight response. This process helps reduce cortisol levels and heart rate, allowing the prefrontal cortex to override impulsive reactions triggered by the amygdala. Clinical studies have shown that diaphragmatic breathing can significantly reduce markers of aggression and improve emotional regulation.