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Recent linguistic research has suggested that non-pathological disfluencies may contain a variety of meaning; the frequency of "uh" and "um" in English is often reflective of a speaker's alertness or emotional state. Some have hypothesized that the time of an "uh" or "um" is used for the planning of future words; other researchers have suggested that they are actually to be understood as full-fledged words rather than accidents, indicating a delay yet to come. There is some debate as to whether to consider them a form of white noise or as a meaning-filled part of language.
Speech disfluencies have also become important in recent years with the advent of text-to-speech programs and other attempts at enabling computers to make sense of human speech.