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45 quick word replacements11/1/2022 ![]() ![]() It is important to note that such a segment replacement method does not remove all acoustic information involved in the identification of that segment. These studies examined sentences using a noise replacement paradigm to present consonant-only sentences (which had all of the vowels deleted and replaced by noise) or vowel-only sentences (the consonants having been removed and replaced by noise). However, several recent studies have demonstrated that vowels are the most important segment for the perceptual intelligibility of sentences ( Cole et al., 1996 Fogerty and Kewley-Port, 2009 Kewley-Port et al., 2007). The traditional view of segmental contributions was summarized clearly as, “it has become almost a commonplace statement in intelligibility testing that most of the information in speech is carried by the consonant sounds” (e.g., Owens et al., 1968, p. Furthermore, in Experiment 2 this study directly manipulates the amount of transitional acoustics associated with the consonant or vowel acoustics to determine how segmental contributions are mediated by these boundary acoustics. Rather than investigating how segments contribute to vowel or consonant identification, Experiment 1 pursues how the dynamic acoustic cues present during these segments contribute generally to word intelligibility. Whereas it is clear that consonant and vowel acoustics are highly overlapping and distributed, an investigation of the predominantly consonantal or vocalic intervals of speech can inform us as to how listeners use the basic acoustic cues present during these segments to understand speech. Segmental contributions to the perceptual intelligibility of speech have recently received increased attention in the literature. Consonants appear to provide speech cues that are equally available and informative during sentence and isolated word presentations. Therefore, it appears that vowels in sentences carry unique speech cues that greatly facilitate intelligibility which are not informative and∕or present during isolated word contexts. However, vowel contributions were mediated by context, with greater contributions to intelligibility in sentence contexts. Results demonstrated that consonants contribute to intelligibility equally in both isolated CVC words and sentences. Comparisons were made with previous segment replacement results using sentences. The proportion of speech presented, regardless of the segmental condition, overwhelmingly predicted performance. ![]() The contribution of consonant and vowel transitional information present at the consonant-vowel boundary was also explored. A significant effect of lexical difficulty was demonstrated for both types of replacement, whereas the noise level used during replacement did not influence results. Results demonstrated no difference between overall word accuracy in these conditions however, different error patterns were observed. A noise replacement paradigm presented CVCs with only consonants or only vowels preserved. This study investigated the relative contributions of consonants and vowels to the perceptual intelligibility of monosyllabic consonant-vowel-consonant (CVC) words. ![]()
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