** Without audible airflow--such as a block of speech or a tense pause where no airflow occurs and no phonation occurs.The disorder is variable, which means that in certain situations the stuttering might be more or less noticeable, such as speaking on the phone or in large groups. People who stutter often find that their stuttering fluctuates, sometimes at random.

The moment of stuttering often begins before the disfluency is produced, described as a moment of "anticipation"--where the person who stutters knows which word they are going