Speech Errors: types and causes
Speech errors that move, substitute, add, or delete sounds, words, or phrases indicate the existence of units of speech. Speech errors also tell us a great deal about the structure and organization of a person’s mental dictionary—the warehouse of all the words a speaker of a language knows. Discuss the usefulness of speech errors for research purposes. Include examples of speech errors; describe the phonological, lexical, or developmental problem that each error illustrates; and explain what each error reveals about correct speech.