Interspeech'2005 - Eurospeech
The p-centre phenomenon is revisited here under a dynamical paradigm. It is our contention that p-centres can be seen as the projection onto the time axis of an underlying phrase stress oscillator inferred during the realisation of the task of producing (and perceiving) a sequence of syllables in time with a metronome. In this kind of inference, vowel onsets act as point attractors for the task of synchronisation. The p-centre, defined as the metronome pulse position relative to the syllable, is considered as the attractor predicted by the subject. The innovative aspects in the experiments carried out to sustain these hypotheses refer to: taking into account as many as 21 Brazilian Portuguese CV syllables; exploring the dynamical aspects of the task, such as variation of the subject's performance due to rate changes; and explaining the subject's behaviour based on period and/or phase locking between syllable production and inferred-from-metronome phrase stress oscillator. The phase differences between the p-centres and the vowel onsets are treated as on-line perturbations of energy rise detected on account of the consonants' spectral composition.
Bibliographic reference. Barbosa, Plínio A. / Arantes, Pablo / Meireles, Alexsandro R. / Vieira, Jussara M. (2005): "Abstractness in speech-metronome synchronisation: P-centres as cyclic attractors", In INTERSPEECH-2005, 1441-1444.