Image of the Day: Mouse Pupil

Pupil constriction during sleep may protect the murine brain from being awakened by sudden flashes of light.

The Scientist Staff and The Scientist Staff

Brain activity (above) corresponds to pupil dilation in a sleeping mouse's eye (below).ÖZGE YÜZGEÇ, MARIO PRSA, ROBERT ZIMMERMANN, DANIEL HUBER

Swiss scientists developed a novel method of studying pupil dilation when they noticed their laboratory mice slept with their eyes open. It uses an infrared light to image the back of the eye. They discovered that pupil size changes rhythmically during sleep, and the dilation correlates with changes in sleep states.

Ö Yüzgeç, et al. “Pupil size coupling to cortical states protects the stability of deep sleep via parasympathetic modulation,” Curr Biol, doi:10.1016/j.cub.2017.12.049, 2018.

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