What question did this study set out to answer?

The aim is to determine if equal light stimuli perceived monocularly result in equal brightness sensations in binocular observers.

March 21, 2026

Comparative Monocular Brightness Contributions in Normal Binocular Observers

Key Points

The aim is to determine if equal light stimuli perceived monocularly result in equal brightness sensations in binocular observers.
Participants matched halves of a bipartite field presented to each eye.
Monocular luminance ratios for brightness matches were measured.
A constant binocular surrounding field was maintained during the experiment.
Overall mismatch in brightness sensations was found to be 2% on average (SD = 2).
Only one participant showed a mismatch greater than 6%.
Two-thirds of observers matched monocular contributions within 4% or better.

Abstract

ABSTRACT In order to find out whether equal monocular light stimuli result in equal monocular brightness sensations in normal binocular observers, one‐half of a bipartite field presented to one eye was matched to the other half seen by the opposite eye while a binocular surrounding field maintained constant adaptation. Ratios of monocular luminances required for brightness matches showed an overall average mismatch of 2% (SD = 2) in 12 subjects. This value is significant at the 0.01 level, and only one subject showed a mismatch greater than 6% (more than 2 SD from the mean). It is concluded that about two‐thirds of normal binocular observers would be expected to show monocular contributions to brightness that match each other within 4% or better.

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