Simultaneous Brightness Contrast
Surround-Dependent Luminance Induction • Two identical gray target boxes appear drastically different depending on surround luminance.
Parameter Controls
Adjust procedural mathematical parameters in real-time to alter or break the illusion.
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🧠 Scientific Explanation & Psychophysics
Retinal ganglion cells with center-surround receptive fields register relative contrast rather than absolute brightness. Dark surrounds cause less lateral inhibition to ganglion cells processing the inner box (making it look brighter), whereas light surrounds trigger strong lateral inhibition (making it look darker).
Why This Works in the Brain
The visual cortex processes incoming sensory information using specialized receptive fields and cortical feature detectors. Illusions occur when mathematical geometries produce conflicting spatial signals, exposing how the brain constructs subjective perception from objective electromagnetic light waves.