The Wug Test is a 27-picture test created by Jean Berko Gleason to study how children handle unfamiliar words and whether they understand basic language rules. Children see pictures of imaginary creatures, objects, and actions with nonsense names and are asked to describe them. In one prompt, a child sees one creature called a “wug” and then two of them and is asked: “This is a WUG. Now there is another one. There are two of them. There are two ___.” . The expected answer is “wugs,” showing use of a plural grammar form.
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