How many times a day do we hold our breath without realising it? In front of the computer, in the car, during a difficult conversation, while rushing to keep up with our obligations. Breathing becomes shallower, choppier, almost mechanical. And yet a slow inhale followed by an even slower exhale can make a real difference. The body drops a gear, the shoulders come down and the mind finds, if only briefly, the calm it has been chasing.
This is not merely a feeling. A new study published in the journal Neuron indicates that slowing the breath, and specifically making the exhale last longer than the inhale, can influence not only the body's physiology but also the way the brain evaluates information and makes decisions.
What the researchers found
Participants in the study were asked to perform a series of decision-making tasks under two conditions: in one they breathed normally, while in the other they followed a slow breathing pattern with a short inhale and a longer exhale.
At the same time, the scientists monitored brain activity through functional MRI, along with indicators such as heart rate variability (HRV), which is often used to assess the balance of the autonomic nervous system.
According to the study, the prolonged exhale increased the activity of the parasympathetic nervous system, the mechanism associated with rest, recovery and the regulation of tension.
Does it change how we judge?
The effect was not confined to the body. It was also linked to changes in how participants evaluated potential rewards when making decisions.
Put simply, when the body was in a calmer physiological state, the brain appeared to give slightly greater weight to the possible positive outcome of a choice. This does not mean the participants became careless or ignored risk. The study pointed instead to a subtle shift in how potential benefits were perceived.
This matters, because we often make decisions while our nervous system is under strain. When we are stressed, the brain can pay more attention to threat, to failure, to what might go wrong. When the body calms down, the same situation may be assessed a little differently.
Breathing as a bridge
Breathing is one of the few bodily functions that happens automatically yet can also be consciously controlled, which makes it a kind of bridge between body and mind. During the inhale, the heart rate tends to rise slightly; during the exhale, it tends to slow. When the exhale lasts longer, the parasympathetic response may be strengthened, sending the body a signal of safety and release.
This is why so many breathing techniques emphasise the slow exhale. Not because there is a magic count that works for everyone, but because a more extended exhale can help the body shift from tension to a calmer state.
How to try it
Start with a simple exercise: breathe in through the nose for about four seconds, then breathe out through the mouth for six or eight seconds.
If that feels difficult, shorten the times. The point is not to strain, but to let the exhale last a little longer than the inhale. Try it for a minute or two when you feel rushed, before answering a demanding message, ahead of a difficult conversation, or whenever you notice your breathing has turned shallow.
The exercise should be gentle. If you feel dizziness, discomfort, pressure or shortness of breath, stop and return to your natural breathing. People with respiratory or heart conditions should consult a health professional before applying breathing techniques systematically.
