Human Growth and Development / Unit 18 HGD 2573 short lesson, about 20 seconds
Depth and the Visual Cliff
Captions available
The idea
Depth perception is absent at birth and begins around two months, entry 0340; on Gibson and Walk's visual cliff, few crawling infants crossed the deep side, entry 0341.
In practice
A new walker stopping at the edge where an experienced crawler edged on.
Where people slip
The misconception is that the cliff proves an inborn fear of heights; avoidance grows with experience of moving, entry 0341.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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