ArticleJournal of neurophysiology2021
Early phase of pupil dilation is mediated by the peripheral parasympathetic pathway.
Article in Journal of neurophysiology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed, 10 citations in OpenAlex.
- Pupillary ultrasonography vs Horner's syndrome to evaluate efficacy of stellate ganglion block in patients.IBRO neuroscience reports · 2025Article
- Autonomic physiological coupling of the global fMRI signal.Nature neuroscience · 2025Article
- Concussion and the Autonomic, Immune, and Endocrine Systems: An Introduction to the Field and a Treatment Framework for Persisting Symptoms.Journal of personalized medicine · 2025Review
- Blink-induced changes in pupil dynamics are consistent and heritable.Scientific reports · 2024Article
- Blink-induced changes in pupil dynamics are consistent and heritable.Research square · 2024Article
- Widespread Autonomic Physiological Coupling Across the Brain-Body Axis.bioRxiv : the preprint server for biology · 2024Article
Corrections and comments
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Authors and funding
2 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Pupil diameter fluctuates in association with changes in brain states induced by the neuromodulator systems. However, it remains unclear how the neuromodulator systems control the activity of the iris sphincter (constrictor) and dilator muscles to change the pupil size. The present study compared temporal patterns of pupil dilation during movement when each muscle was pharmacologically manipulated in the human eye. When the iris sphincter muscle was blocked with tropicamide, the latency of pupil dilation was delayed and the magnitude of pupil dilation was reduced during movement. In contrast, when the iris dilator muscle was continuously stimulated with phenylephrine, the latency and magnitude of rapid pupil dilation did not differ from the untreated control eye, but sustained pupil dilation was reduced until the end of movement. These results suggest that the iris sphincter muscle, which is under the control of the parasympathetic pathway, is quickly modulated by the neuromodulator system and plays a major role in rapid pupil dilation. However, the iris dilator muscle receives signals from the neuromodulator system with a slow latency and is involved in maintaining sustained pupil dilation.
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Registered trials
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