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For optimal word recognition listeners should use all relevant acoustic information as soon as it comes available. Using printed-word eye tracking we investigated when during word processing Dutch listeners use suprasegmental lexical stress information to recognize words. Fixations on targets such as "OCtopus" (capitals indicate stress) were more frequent than fixations on segmentally overlapping but differently stressed competitors ("okTOber") before segmental information could disambiguate the words. Furthermore, prior to segmental disambiguation, initially stressed words were stronger lexical competitors than noninitially stressed words. Listeners recognize words by immediately using all relevant information in the speech signal.
Reinisch et al. (Tue,) studied this question.