Jordania has further suggested that human humming could have been a contact method that early humans used to avoid silence.

Charles Darwin wrote about this in relation with wild horse and cattle. Some social animal species communicate the signal of potential danger by stopping contact calls and freezing, without the use of alarm calls, through silence. These are a mixture of various sounds, accompanying the group's everyday business (for example, foraging, feeding), and they are used to maintain audio contact with the members of the group. Many social animals produce seemingly haphazard sounds which are known as contact calls. Joseph Jordania has suggested that in social animals (including humans), silence can be a sign of danger. Rhetorical silence targets an audience rather than the rhetorician. When silence becomes rhetorical, it is intentional since it reflects a meaning. It has not merely been recognized as a theory but also as a phenomenon with practical advantages. Silence may become an effective rhetorical practice when people choose to be silent for a specific purpose. Relatively prolonged intervals of silence can be used in rituals in some religious disciplines, people maintain silence for protracted periods, or even for the rest of their lives, as an ascetic means of spiritual transformation. Discourse analysis shows that people use brief silences to mark the boundaries of prosodic units, in turn-taking, or as reactive tokens, for example, as a sign of displeasure, disagreement, embarrassment, desire to think, confusion, and the like. Sometimes speakers fall silent when they hesitate in searching for a word, or interrupt themselves before correcting themselves. Silence is the absence of ambient audible sound, the emission of sounds of such low intensity that they do not draw attention to themselves, or the state of having ceased to produce sounds this latter sense can be extended to apply to the cessation or absence of any form of communication, whether through speech or other medium.

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