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・ Contact (Pointer Sisters album)
・ Contact (Saving Hope)
・ Contact (Silver Apples album)
・ Contact (Thirteen Senses album)
・ Contact (video game)
・ Contact 94
・ Contact a Family
・ Contact Air
・ Contact analysis (cryptanalysis)
・ Contact angle
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・ Contact binary (small Solar System body)
・ Contact breaker
Contact call
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・ Contact from the Underworld of Redboy


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Contact call : ウィキペディア英語版
Contact call
Contact calls are seemingly haphazard sounds made by many social animals (such as a chicken's cluck).〔Macedonia, J. (1986). Individuality in the contact call of the ring-tailed lemur (Lemur catta). American Journal of Primatology, 11, 163-179〕 Contact calls are very different from many other types of calls (for example, alarm calls), as contact calls are not a specific signal, designed to communicate some specific information. It is rather a mixture of various sounds, accompanying the group's everyday business (for example, foraging). Contact calls are used to maintain audio contact with the members of the group. Some social animal species communicate the signal of potential danger by stopping contact calls, without the use of alarm calls. Charles Darwin wrote about this in relation with wild horse and cattle.
==Humming as contact calls==
Joseph Jordania suggested that human humming could have played a function of contact calls in early human ancestors.〔Jordania, J. (2009). Times to Fight and Times to Relax: Singing and Humming at the Beginnings of Human Evolutionary History. Kadmos, 1, 272–277〕 According to his suggestion, humans find it distressing to be in full silence (which is a sign of danger for them), and this is why humans who are alone sometimes hum, whistle, talk to themselves, or listen to TV or radio during other activities.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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