Final answer:
The two types of perceptual constancy noted in the textbook are shape constancy and size constancy, which allow us to perceive objects as having stable shape and size despite changes in angle, distance, or lighting.
Step-by-step explanation:
The two types of perceptual constancy as noted in the textbook are shape constancy and size constancy. These are crucial aspects of our perceptual system that allow us to recognize objects as being the same despite changes in perspective, distance, or illumination. Perceptual constancies help us maintain a stable perception of the world around us.
Shape constancy is the ability to perceive an object as having the same shape even when its image on the retina changes due to the object being viewed from different angles. Size constancy allows us to perceive objects as maintaining the same size regardless of their changing distance from us, which means that even as objects move closer or further away, our perception of their size remains constant.
These perceptual constancies are essential for us to interact with our environment effectively and navigate through space. They are part of the broader study of visual perception in the field of cognitive psychology and neuroscience.