Listening experiments with spliced speech showed that cues for the perception of word juncture occurred always at word onset, at word offset only for /l/ and /r/, and never word medially. Spectrograms showed the cues to be bursts, aspiration, glottal stops, laryngealization, and distinct syllable-initial allophones of /l/ and /r/.
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Nakatani et al. (1977) studied this question.