Two circles can be seen in this photo. One is inside a rectangle, while the other isn’t. While the circle in the rectangle looks like a lighter shade of grade when compared to the other circle, the truth is that the two circles have the same color. But why does this happen? Why do the circles look like they’re different shades of gray? This has been a question that scientists have for over 100 years, and now it would seem that there is an answer to this age-old mystery.
It turns out luminance, even though we're not always conscious of it, does contribute to our brightness estimates, suggesting high-level thought processes are not required to make this judgement between contrasts.
The team found that our estimates of brightness occur very early in our visual processing pathway, before information from both eyes is even merged in our brains
More details about this enlightening study over at ScienceAlert.
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