Abstract
Peak shift is a universal result of most discrimination learning: if an organism is taught to respond to one stimulus and not to respond to another stimulus lying along the same perceptual continuum, it shows maximal responsiveness not to the target stimulus but to a stimulus displaced along the continuum in a direction away from the unreinforced stimulus. It also responds more vigorously to the displaced stimulus than it would have to the target stimulus had discrimination training not occurred. This is the phenomenon of behavioral contrast. On the level of preference, peak shift means that if we prefer something, we shall like something a bit more extreme even more. Peak shift and behavioral contrast are probably the most important causes of sound change in language, but this has never been pointed out. The relevance of peak shift and behavioral contrast to phonological change is explained. Their most general consequence is that the phonetic realization of phonemes is usually in a continual state of evo...
Published Version
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