Human Growth and Development / Unit 3 HGD 0365 short lesson, about 20 seconds
Over- and Underextension
Captions available
The idea
Overextension applies a word too broadly, as when every four-legged animal is a kitty; underextension applies it too narrowly, only to the family cat.
In practice
A toddler pointing at a tiger in the zoo and calling it kitty.
Where people slip
Both errors show a child working out a word's boundaries, and both fade as vocabulary grows.
Your place on the trail
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Builds on
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