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Measuring the Behavioral Effects of Intraocular Scatter

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A temporal window for estimating surface brightness in the Craik-O'Brien-Cornsweet effect.

Ayako Masuda¹, Junji Watanabe², Masahiko Terao³

¹Department of Integrated Psychological Science, Kwansei Gakuin University Nishinomiya, Japan.

Frontiers in Human Neuroscience

|November 19, 2014

Summary

The Craik-O'Brien-Cornsweet effect (COCe), a brightness illusion, is modulated by contextual cues. This study shows visual processing for these cues is separate from the main COCe mechanism and linked later.

Keywords:

Craik-O'Brien-Cornsweet effect brightness induction masking subjective contour temporal window

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Area of Science:

Visual Perception
Neuroscience
Computational Vision

Background:

The Craik-O'Brien-Cornsweet effect (COCe) is a brightness illusion explained by low-level spatial filtering.
Contextual cues, like frame elements, significantly modulate the COCe, suggesting influence from lighting priors.
It remains unclear if contextual modulation processing is independent of the primary COCe filtering mechanism.

Purpose of the Study:

To investigate if the processing of contextual modulation in the COCe is independent of the filtering mechanisms responsible for the main effect.
To determine the temporal dynamics of how the visual system integrates contextual frame elements with the central edge (COC edge).

Main Methods:

The study manipulated the temporal onset asynchrony between the COC edge and a surrounding frame element.
Luminance contrast of the frame, durations, display conditions (interocular/binocular), and frame line types were varied.
The magnitude of the COCe was measured under these varying conditions.

Main Results:

A significant COCe was observed within a broad temporal window of approximately 600-800 ms (centered at 0 ms onset asynchrony).
This temporal integration window remained consistent across variations in frame luminance contrast, element durations, display conditions, and frame line types.
The observed temporal window for binding the COC edge and frame element (~1 s) exceeds typical visual persistence ranges.

Conclusions:

The visual system binds the COC edge and frame element over an extended temporal window (~1 s) for surface brightness estimation.
Information from the basic spatial filtering mechanism and contextual cue processing are handled separately and integrated later.
This suggests a multi-stage processing architecture for visual illusions influenced by context.