Abstract
There were 48 “sentences” (e.g., “LAS a BAS a LAS, a GAS a LAS a PAS” or “KAS a LAS a PAS, a LAS a BAS a LAS”) each pronounced with a slight phraselike boundary after the fifth syllable. Four groups of practiced subjects pressed a reaction-time (RT) button to their assigned segmental target /b, d, g, or k/ which occurred equally often in syllables one, three, five (first phrase), seven, nine or eleven (second phrase). The decrease in target RT as a function of time into the sentence was not monotonic. Instead, target RT decreased successively within the first phrase, but increased after the boundary before decreasing again within the second phrase. This “scallop” effect suggests a relative discontinuity across boundaries in both production and perception. Phrases are units in the sense that articulatory-acoustic sequential redundancy (correlation) is higher within that between phrases. In perception, such redundancy facilitates increased ease in “tracking” the successive syllables in a phrase until the boundary is reached. [Work supported by NIH.]
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