3.13 : 知觉恒常性

Perceptual constancy refers to the recognition that objects remain constant even when they appear different due to changes in lighting, distance, or angle.

There are four primary types of perceptual constancy – size constancy, shape constancy, color constancy, and brightness constancy.

Firstly, size constancy implies that an object maintains the same size, such as a bus appearing large enough to carry people even when viewed from a distance, despite changes in the retinal image.

Shape constancy is the ability to recognize that an object, such as a book, retains its rectangular shape despite changes in orientation, like lying flat or vertically on a shelf.

Color constancy is the recognition that an object, such as a green apple, retains its color green under varying lighting conditions – whether viewed under bright noon sunlight or artificial light.

Lastly, brightness constancy, or lightness constancy, involves perceiving an object, such as a white sheet of paper, as white whether it is under bright sunlight or low light.