Perceptual Constancies
Size constancy- When an object is within a certain range, peoples perception of the size of that object will not change, regardless of changes in distance, or "video size change to the retina."
Example- If you are only within a few feet from a dog or a cat, that animal can go back and forth a few feet, and they will still look generally the same size.
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| https://upload.wikimedia.org/wikipedia/commons/2/24/Shape_constancy.gif |
These doors are technically different distances away, yet that does not distort our perception of their size, as they all look the same size,
Brightness Constancy- A visual object, even after being lit up in two entirely different conditions, say day and night, will appear to us as having the same brightness.
Example- If you take a white paper plate in a brightly lit room, and then take it and put it into a dimly lit room, that plate will still appear to be the same color, with the same brightness
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http://www.kevinconnery.com/imaging/samples/color_constancy_neutral.gif As the shade of the outer boxes change, the apparent brightness and shade of the inner boxes still appears unchanged. Shape constancy- Even is the shape of an objects retinal image appears different, our perception of that object will remain the same. Example- As we see a door open and close, the rectangular shape may appear to get distorted, but we still perceive it as a rectangle.  http://psychology252.blogspot.com/2014/11/perception-laws-size-constancy-is.html Both cubes are perceived to be the same shape, even though the retinal image of the second one is not exactly a cube. |
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