What apparatus is used to measure depth perception, consisting of a glass-covered table with a 'shallow' side and a 'deep' side?

What apparatus is used to measure depth perception, consisting of a glass-covered table with a 'shallow' side and a 'deep' side?

• A. Visual Cliff
• B. Rovee-Collier
• C. Halo Effect
• D. Stepping

Answer: (A)

Depth perception is the ability to judge how far away something is, which infants begin to use to avoid falls. This setup uses a glass-covered platform that looks like a cliff: one side appears shallow, the other side deep, though the surface remains safe to stand on. The deep side relies on depth cues—such as perspective and the pattern on the far surface—to create the illusion of a drop-off. If an infant avoids stepping onto the deep side, it shows they can perceive the perceived depth and anticipate danger. This is exactly what the visual cliff was designed to measure. The other options refer to different ideas or tasks (a memory task, a cognitive bias, or a motor task) and do not test depth perception in this way.

Depth perception is the ability to judge how far away something is, which infants begin to use to avoid falls. This setup uses a glass-covered platform that looks like a cliff: one side appears shallow, the other side deep, though the surface remains safe to stand on. The deep side relies on depth cues—such as perspective and the pattern on the far surface—to create the illusion of a drop-off. If an infant avoids stepping onto the deep side, it shows they can perceive the perceived depth and anticipate danger. This is exactly what the visual cliff was designed to measure. The other options refer to different ideas or tasks (a memory task, a cognitive bias, or a motor task) and do not test depth perception in this way.