This paper investigates processing interactions between segmental (stop place) vs. suprasegmental (prosodic boundary) information in English using a two-choice speeded classification procedure. The results suggest that due to the presence of the boundary tonal contour, intonational phrase-boundary information can be processed more independently from stop-place information than phrase-internal, word-boundary information can. Our finding converges with lateralisation literature reporting left-hemisphere advantage for rapidly changing acoustic information (e.g. cues for stop place) and right-hemisphere advantage for sentence intonation for speakers of non-tonal languages.