Figure 1.

Analysis pipeline. (a) An example Intonation Unit sequence from a conversation in Du Bois et al.¹¹. (b) Illustration of one of the characteristics contributing to the delimitation of IUs: the fast-slow dynamic of syllables. A succession of short syllables is followed by comparatively longer ones; new units are cued by the resumed rush in syllable rate following the lengthening (syllable duration measured in ms). (c) Illustration of the phase-consistency analysis: 2-s windows of the speech envelope (green) were extracted around each IU onset (gray vertical line), decomposed and compared for consistency of phase angle within each frequency. (d) Illustration of the IU-onset permutation in time, which was used to compute the randomization distribution of phase consistency spectra (see “Materials and methods” section).