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Perception is not an isolated event. Context stimuli neighboring in time and space affect the encoding, rep-resentation, and interpretation of target stimuli. Phonetic context effects are a set of particularly interesting exam-ples of context-sensitive perception, whereby identifica-tion of target speech sounds is shifted by the preceding or following phonetic context. For example, identification of an ambiguous target syllable as /da / or /!a / is shifted by preceding /ar / or /al / contexts (Mann, 1980). A variety of studies have demonstrated that the per-ceived identity of target speech sounds also can be shifted by nonspeech sounds that mimic the spectral characteris-tics of effective phonetic contexts. For example, Lotto and Kluender (1998) presented /da/–/!a / syllables preceded by tone glides matched in frequency to the third forman