Final answer:
Perceptual constancy refers to the ability to perceive objects as having consistent color, brightness, shape, and size. It allows us to recognize objects and understand their properties despite changes in the environment.
Step-by-step explanation:
Perceptual constancy refers to perceiving objects as having a consistent color, brightness, shape, and size. It is the ability of our visual system to maintain a consistent perception of an object's properties despite changes in the environment, such as lighting conditions or viewing angle.
For example, if we see a red apple in bright sunlight, we will still perceive it as red even if we view it under different lighting conditions, such as fluorescent light or candlelight.
This ability is important for our perception of the world because it allows us to recognize objects and understand their properties despite variations in the sensory input we receive.