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Related Experiment Video

Updated: Jan 27, 2026

Pupillary Response as Assessment of Effective Seizure Induction by Electroconvulsive Therapy
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Localization of Neuronal Gain Control in the Pupillary Response.

Corinne Frances Carle1,2, Andrew Charles James1, Yanti Rosli3

  • 1John Curtin School of Medical Research, Eccles Institute of Neuroscience, The Australian National University, Canberra, ACT, Australia.

Frontiers in Neurology
|April 2, 2019
PubMed
Summary
This summary is machine-generated.

Multifocal pupillographic objective perimetry (mfPOP) uses pupil responses to map vision. Gain control in this visual pathway primarily occurs at the Edinger-Westphal nuclei (EWN), not the retina or pretectal olivary nuclei (PON).

Keywords:
gain-controlmultifocalneural pathwaysperimetrypupilpupillometryvisual fields

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual Perception

Background:

  • Multifocal pupillographic objective perimetry (mfPOP) is an emerging alternative to standard visual perimetry.
  • mfPOP extracts pupil responses to stimuli, with gain control influenced by stimulus density.
  • The precise location of this gain control within the pupillary pathway requires localization.

Purpose of the Study:

  • To determine the specific neural locus of gain control within the pupillary pathway during mfPOP testing.
  • To differentiate the roles of the retina, pretectal olivary nuclei (PON), and Edinger-Westphal nuclei (EWN) in pupillary response modulation.

Main Methods:

  • Eight subjects underwent mfPOP testing with 14 stimulus variants.
  • Stimulus temporal density was manipulated at the retinal, PON, and EWN levels by altering presentation rates and restricting stimulus locations.
  • Pupil constriction amplitudes were measured and compared across variants with differing signal densities at specific neural levels.

Main Results:

  • No significant differences in pupil constriction amplitude were found when retinal or PON signal density varied, provided EWN density was matched.
  • Significant reductions in pupil constriction amplitude occurred when EWN signal density differed, even with matched retinal and PON densities.
  • These effects were consistent across different stimulus field restrictions (homonymous hemifield, nasal, temporal).

Conclusions:

  • The majority of gain control in the subcortical pupillary pathway during mfPOP testing resides at the level of the Edinger-Westphal nuclei (EWN).
  • This finding helps refine the understanding of the neural circuitry underlying objective perimetry and pupillary light reflexes.