Final answer:
Key sources of information for distance and depth perception include motion parallax, detection of edges, and retinal disparity, which all contribute to our understanding of spatial relationships in our environment.
Step-by-step explanation:
The sources of information about distance and depth perception include motion parallax, detection of edges, and retinal disparity. Motion parallax occurs when objects at different distances move across the retina at different rates when we move our heads or travel. The detection of edges helps in perceiving the shape and depth of objects, which in turn contributes to our understanding of their position in space. Retinal disparity is the difference in the visual images that each eye perceives because of the eyes' different positions. The brain uses this disparity to judge the distance of objects, making it a crucial source of depth perception.