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Effect of stimulus width on simultaneous contrast.

Veronica Shi¹, Jie Cui, Xoana G Troncoso

¹Department of Neurobiology, Barrow Neurological Institute , Phoenix, AZ , USA.

|September 14, 2013

Summary

This summary is machine-generated.

Simultaneous contrast, the perceived brightness of a stimulus, weakens logarithmically with increasing stimulus width. This visual perception phenomenon is accurately modeled by a Difference-of-Gaussians filter.

Keywords:

Brightness Edges Illusion Simultaneous contrast Size Width

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Area of Science:

Visual perception
Psychophysics
Computational neuroscience

Background:

Simultaneous contrast describes how perceived stimulus brightness changes with its background.
Previous research suggests stimulus width impacts contrast strength, but this relationship was not quantified.

Purpose of the Study:

To quantify the relationship between stimulus width and the perceptual strength of simultaneous contrast.
To determine if a computational model can predict this relationship.

Main Methods:

Experiments involved presenting stimuli of varying widths against different backgrounds.
Perceptual judgments of brightness were collected.
A Difference-of-Gaussians (DOG) filter was applied to stimuli of varied widths.

Main Results:

A logarithmic relationship was found between stimulus width and perceived brightness.
The strength of simultaneous contrast decreased as stimulus width increased.
The normalized output of a DOG filter accurately matched the observed perceptual data.

Conclusions:

The perceived strength of simultaneous contrast follows a quantifiable logarithmic function of stimulus width.
Computational models, specifically the DOG filter, can effectively predict this visual perception phenomenon.