Excerpt volume: Gibson's “visual cliff”

This simple apparatus is used to investigate depth perception in different animals. All species thus far tested seem able to perceive and avoid a sharp drop as soon as they can move about.

本简易实验装置用于研究不同动物的深度知觉（depth perception）。截至目前已接受测试的所有物种，均能在具备自主移动能力后即刻感知并规避此类陡峭落差。