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Updated: Aug 11, 2026
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Measuring the Behavioral Effects of Intraocular Scatter
Published on: February 18, 2021
Time course of brightness under transient glare condition
Luis A Issolio1, José F Barraza, Elisa M Colombo
1Departamento de Luminotecnia, Luz y Visión, Universidad Nacional de Tucumán, Tucumán, Argentina. lissolio@herrera.unt.edu.ar
Summary
Peripheral glare sources inhibit foveal stimulus brightness. This study investigated the dynamic of brightness reduction, finding it aligns with the Broca-Sulzer effect, suggesting postretinal processing.
Area of Science:
- Vision science
- Neuroscience
- Psychophysics
Background:
- Peripheral glare sources are known to reduce the perceived brightness of foveal stimuli.
- The underlying mechanism for this brightness reduction is hypothesized to involve inhibitory effects.
Purpose of the Study:
- To investigate the dynamic of brightness reduction of an incremental stimulus following the onset of a peripheral glare source.
- To model the inhibitory effect of glare on visual test signals.
Main Methods:
- A magnitude comparison paradigm with constant stimuli was employed.
- Standard stimulus luminance was set in the mesopic range (0.5 cd/m2).
- Glare levels of 15 and 60 lx were used.
Main Results:
- The time course of brightness reduction exhibited characteristics of the Broca-Sulzer effect.
- A model incorporating peripheral ganglion cell response to glare and subsequent inhibition of test signals was fitted to the data.
Conclusions:
- The findings support an inhibitory mechanism where peripheral glare affects foveal stimulus processing.
- The results suggest the plausibility of a postretinal stage involved in this visual phenomenon.
