Abstract
This study compared identification of dichotically presented pairs of meaningless sequences presented under two different conditions, respectively termed structured and unstructured. The dichotic sequences in both conditions contained the same nonsense syllable stems, English bound morphemes, and English function words. The sequences in the structured condition were grammatically ordered in the sense that if the nonsense stems were replaced by English stems a grammatical sentence would result; as well, the structured sequences were characterized by the acoustic correlates of constituent structure. In contrast, the elements of the unstructured sequences were randomly rearranged and delivered in list form containing none of the overt rhythms of speech. Total accuracy of recognition was found to be significantly superior in the structured condition. In addition, although right-ear superiority was observed in both conditions, the laterality effect was significant only in the structured condition.
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