Exploring macro-rhythm in African American English

This study contributes to a growing body of research on quantifying the theory of macro-rhythm, a model of prosodic typology proposed by Sun-Ah Jun (2014) that looks at the global pitch patterns of an utterance, through comparing African American English (AAE) to Mainstream (white) US English (MUSE). Based on prior research on intonation, rhythm, and prosody in AAE (cf. Thomas, 2015 for a thorough overview), we predicted that AAE would have stronger macro-rhythm than MUSE, such that speakers would produce higher peaks and lower valleys, pitch excursions of greater magnitude, have a greater consistency in slope, a greater frequency of high (H) and low (L) pitch targets, and more regular spacing of these pitch targets. Data weretaken from the Valdosta group of the Corpus of Regional African American Language (CORAAL) for Black speakers and the Buckeye corpus for white speakers. Contrary to our expectations, Buckeye speakers proved to be more macro-rhythmic than their CORAAL counterparts in all but one metric, but these results confirm that macro-rhythm is a viable method for cross-dialectal analysis as it reveals quantifiable differences between speaker dialect groups of the same language.