Research from the Karolinska Institute reveals a link between breathing and pupil size. The study found that pupils constrict during inhalation and dilate during exhalation, potentially influencing visual perception. This cyclical mechanism, independent of external stimuli, could optimize vision for detail focus during inhalation and object detection during exhalation. Experiments with over 200 participants confirmed these findings across various conditions, suggesting brainstem control. The discovery has potential clinical applications, such as aiding the diagnosis of neurological disorders.

https://neurosciencenews.com/breathing-visual-perception-28438/

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