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Pitch peaks tend to be higher at the beginning of longer than shorter sentences (e.g., 'A farmer is pulling donkeys' vs 'A farmer is pulling a donkey and goat'), whereas pitch valleys at the ends of sentences are rather constant for a given speaker. These data seem to imply that speakers avoid dropping their voice pitch too low by planning the height of sentence-initial pitch peaks prior to speaking. However, the length effect on sentence-initial pitch peaks appears to vary across differentdoi:10.1371/journal.pone.0259343 pmid:34784351 pmcid:PMC8594795 fatcat:jb4z7gehinejzh27lkqeafr3hm