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The perception of assimilation of ‘voice’ in Dutch two-obstruent clusters across word boundaries was measured as a function of cluster duration. In an experiment employing synthetic speech stimuli the duration of the silent interval of the plosives and of the noise part of the fricatives was varied. The clusters were embedded in three types of linguistic context: sentences, words, and nonsense words. Longer durations gave rise to more ‘voiceless’ percepts, resulting in the perception of more ‘progressive assimilation’, at the expense of ‘regressive assimilation’ and ‘no assimilation’. Nonwords behaved slightly differently from sentences and words. The different response pattern for nonwords is ascribed to a different phonetic context rather than to lexical or phonological factors.