Without audible airflow—such as a block of speech or a tense pause where nothing is said despite efforts. Superfluous behaviors[10] Verbal—this includes an interjection such as an unnecessary uh or um as well as revisions, such as going back and correcting one's initial statements such as "I—My girlfriend...", where the I has been corrected to the word my. Nonverbal—these are visible or audible speech behaviors, such as lip smacking, throat clearing, head thrusting, etc., usually representing an effort to break through or circumvent a block or stuttering loop.