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It is part of the North American culture-that people should be
kept at a distance, andthat contact with another person's body
should be avoided in all but the most intimate situationSs. Because
of this social convention of dealing with others at a distance,
people in the U.S. have to place much reliance on their distance
receptors, their eyes and ears, for personal commumicatiom.
(関西学院大)