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Haptics is the study of touching behavior. Touch is an extremely important sense for humans; as well as providing information about surfaces and textures it is a component of nonverbal communication in interpersonal relationships, and vital in conveying physical intimacy. It can be both sexual (such as kissing) and platonic (such as hugging or tickling). The word touch has many other metaphorical uses. One can be emotionally touched, referring to an action or object that evokes a sad or joyful feeling. To say "I was touched by your letter" implies the reader felt joy or sadness when reading it. Touch is the earliest sense to develop in the fetus, and the development of infants' haptic senses, and how that relates to the development of the other senses such as vision, has been the target of much research. Human babies have been observed to have enormous difficulty surviving if they do not possess a sense of touch, even if they retain sight and hearing. Babies who can perceive through touch, even without sight and hearing, fare much better. Touch can be thought a basic sense in that most life forms have a response to being touched, while only a subset have sight and hearing. In chimpanzees the sense of touch is highly developed. As newborns they see and hear poorly but they grasp strongly to their mothers. Harry Harlow conducted a controversial study involving rhesus monkeys and observed that monkeys reared with a "terry cloth mother", a wire feeding apparatus wrapped in softer terry cloth which provided a level of tactile stimulation and comfort, were considerably more emotionally stable as adults than those with a mere wire mother.
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