While Viewing the Hermann Grid,we See Gray Dots at the Intersections

question 99

Multiple Choice

While viewing the Hermann Grid,we see gray dots at the intersections of the lines that disappear when we look directly at an intersection.Most explanations of this phenomenon argue that it results from

• A) fatigue of photoreceptors from looking at the bright lines.
• B) the receptive field organization of ganglion cells.
• C) color contrast.
• D) color constancy.

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