Now scientists have discovered a fourth: breathing. The pupil is smallest around inhalation onset and largest during exhalation.

Researchers at Karolinska Institutet in Sweden have discovered a fundamental mechanism that affects the size of the pupil, namely our breathing.

Researchers have discovered a fundamental mechanism that affects pupil size: breathing. The study shows that the pupil is smallest during inhalation and largest during exhalation, which could ...

Researchers have discovered a fundamental mechanism that affects pupil size: breathing. The study shows that the pupil is smallest during inhalation and largest during exhalation, which could ...

Breath retention can be challenging for those new to yoga, so you can decrease the holding between the inhalation and exhalation while keeping the exhalation twice as long as the inspiration.

Breath retention can be challenging for those new to yoga, so you can decrease the holding between the inhalation and exhalation while keeping the exhalation twice as long as the inspiration.