Rhythm class perception by expert phoneticians

This paper contributes to the recent debate in linguistic-phonetic rhythm research dominated by the idea of a perceptual dichotomy involving “syllabletimed” and “stress-timed” rhythm classes. Some previous studies have shown that it is difficult both to find reliable acoustic correlates of these classes and also to obtain reliable perceptual data for their support. In an experiment, we asked 12 British English phoneticians to classify the rhythm class of 36 samples spoken by 24 talkers in six dialects of British English. Expert listeners’ perception was shown to be guided by two factors: (1) the assumed rhythm class affiliation of a particular dialect and (2) one acoustic cue related to the prosodic hierarchy, namely the degree of accentual lengthening. We argue that the rhythm class hypothesis has reached its limits in informing empirical enquiry into linguistic rhythm, and new research avenues are needed to understand this multi-layered phenomenon.