The voice is another form of nonverbal communication. Social scientists use the term paralanguage to describe nonverbal, vocal messages. The impact of paralinguistic cues is strong. Research shows that listeners pay more attention to the vocal messages than to the words that are spoken when asked to determine a speaker's attitudes. Furthermore, when vocal factors contradict a verbal message, listeners judge the speaker's intention form the paralanguage, not from the words themselves. There are many other ways the voice communicates- through its tone, speed, pitch, volume, number and length of pauses, and disfluencies (such as stammering and use of 'uh' 'um' etc.) All these factors can do a great deal to reinforce or contradict the message our words convey. Sarcasm is one instance in which both emphasis and tone of voice help change a statement's meaning to the opposite of its verbal message. Paralanguage can affect behaviour in many ways, some of which are rather surprising. Researchers have discovered that communicators are most likely to comply with requests delivered by speakers whose speaking rates are similar to their own. Some vocal factors influence the way a speaker is perceived by others. People who speaking more slowly are judged as having greater conversational control than fast talkers.