“…Johnson (1955) found that the median interval between the first spoken words and the onset of stuttering was 23 months, again yielding a mean age of 32 months. This pattern is consistent with the conclusion that stuttering does not occur at the one-word or two-word stage 1 (Eisenson, 1984; Karniol, 1992). The onset of stuttering generally occurs at the point in development at which children start incorporating the syntactic rules of their language in their productions (e.g., Brown, 1973; Slobin, 1970).…”