One way we learned about when babies develop depth perception was

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The visual cliff experiment is a classic study that explored when and how babies develop depth perception. It involved a specially designed apparatus with a glass surface that created an apparent drop-off. Researchers observed the behavior of babies placed on both the shallow and deep sides of the "cliff" to see if they demonstrated a fear of falling, a key indication of depth perception.

One Way We Learned About When Babies Develop Depth Perception