Wug test

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The wug test is an experiment in linguistics, created by Jean Berko Gleason in 1958. It was designed as a way to investigate the acquisition of the plural and other inflectional morphemes in English-speaking children.

There are three plural allomorphs in English:

The child is presented with a drawing of an unfamiliar creature, often blue and bird-like,[1][2] and told, "This is a wug." Another wug is revealed, and the researcher says, "Now there are two of them. There are two...?" Children who have successfully acquired the allomorph /z/ of the plural morpheme will respond: wugs /ˈwʌɡz/.

Very young children are baffled by the question and are unable to answer correctly, sometimes responding with "Two wug." Preschoolers aged 4 to 5 test best in dealing with /z/ after a voiced consonant, and generally say that there are two wugs, with a /z/; they do almost as well with the voiceless /s/. They do less well in dealing with /z/ in other environments such as after nasals, rhotics, and vowels. Children in the first year of primary school were almost fully competent with both /s/ and /z/. Both preschool and first-grade children dealt poorly with /ɨz/, giving the correct answer less than half the time, possibly because it occurs in the most restrictive context. Also, because the root of the test word often ended in /s/ in these cases, the children may have assumed that the word was already in its plural form. Even though the children were all able to produce the real plural "glasses" they generally responded two "tass" rather than two "tasses" when shown more than one nonsense creature called a "tass".

The Wug Test also includes questions that explore a child's understanding of verb conjugation and the possessive. Additional items were designed to investigate children's ability to handle common derivational morphemes such as the agentive -er (a man who "zibs" is a ....?). Very young children (preschoolers) form compounds rather than agentives with -er. (e.g. a man whose job is to "zib" is a "zibman"). A final series of questions called on the children to explain common compound words in their vocabulary ("Why is a birthday called a birthday?"). Young children also explain compound words in terms of their cultural, rather than linguistic, features (e.g. a birthday is called "birthday" because one receives presents).

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