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pupil size

Featured Neurology Neuroscience Visual Neuroscience

·April 13, 2025·6 min read

Breathing Syncs with Pupil Size, Revealing a New Mind-Body Link

A groundbreaking study has revealed that our pupils change size in sync with our breathing—a response now dubbed the "pupillary respiratory phase response." Researchers confirmed that pupils are smallest around the start of inhalation and largest during exhalation, regardless of lighting, focus, or cognitive effort.

Featured Neuroscience

·March 5, 2025·5 min read

Sleeping With Eyes Open: How Pupil Size Reveals Brain Activity

A new study reveals that pupil size fluctuates constantly during sleep, reflecting changes in brain activation levels. Researchers developed a novel method to keep test subjects' eyes open, allowing them to monitor these dynamics without disrupting sleep.

Featured Neuroscience Visual Neuroscience

·January 5, 2025·6 min read

Pupil Dynamics During Sleep Reveal Brain’s Memory-Saving Secrets

Researchers have discovered that pupil size during non-REM sleep correlates with memory consolidation. When pupils contract, the brain focuses on consolidating new memories; when dilated, it processes older ones.

Featured Neuroscience Visual Neuroscience

·July 15, 2023·6 min read

Pupil Size Regulated by Orexin, Not Stress Hormones

Researchers have discovered that the neurotransmitter orexin, not the stress hormone noradrenaline, regulates pupil size, challenging prior understanding. Orexin neurons affect pupil size in response to emotional states and mental strain, not just light exposure.