Anxiety changes how students attempt to interact in the language @1991horwitz_foreign. It can limit which grammatical structures, topics, and genres students use.
second language evidence: @1977kelinmann @1986steinberg&horwitz
first language evidence: @1975daly&miller @1977daly
Another way this can happen is when the student develops perfectionist attitudes towards language use where students are apprehensive about using the language until their performance is error-free.