Cues to the voicing distinction for final /f,s,v,z/ were assessed for 24 impaired- and 11 normal-hearing listeners. In base-line tests the listeners identified the consonants in recorded /d circumflex C/ syllables. To assess the importance of various cues, tests were conducted of the syllables altered by deletion and/or temporal adjustment of segments containing acoustic patterns related to the voicing distinction for the fricatives. The results showed that decreasing the duration of /circumflex/ preceding /v/ or /z/, and lengthening the /circumflex/ preceding /f/ or /s/, considerably reduced the correctness of voicing perception for the hearing-impaired group, while showing no effect for the normal-hearing group. For the normals, voicing perception deteriorated for /f/ and /s/ when the frications were deleted from the syllables, and for /v/ and /z/ when the vowel offsets were removed from the syllables with duration-adjusted vowels and deleted frications. We conclude that some hearing-impaired listeners rely to a greater extent on vowel duration as a voicing cue than do normal-hearing listeners.
Moderately to profoundly hearing-impaired (n = 30) and normal-hearing (n = 6) listeners identified [p, k, t, f, theta, s] in [symbol; see text], and [symbol; see text]s tokens extracted from spoken sentences. The [symbol; see text]s were also identified in the sentences. The hearing-impaired group distinguished stop/fricative manner more poorly for [symbol; see text] in sentences than when extracted. Further, the group's performance for extracted [symbol; see text] was poorer than for extracted [symbol; see text] and [symbol; see text]. For the normal-hearing group, consonant identification was similar among the syllable and sentence contexts.
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The influence of voice‐onset time (VOT) and vowel‐onset characteristics on the perception of the voicing contrast for initial plosive consonants was examined for hearing‐impaired children, and normal‐hearing children and adults. Listeners identified spoken ‘DAD’–‘TAD’ stimuli controlled for VOT and vowel onset characteristics. Only six of 16 hearing‐impaired children appropriately identified the exemplar DAD and TAD stimuli used as endpoints of VOT continua. For this group of six hearing‐impaired children, a longer VOT than for the normal‐hearing listeners was required to elicit /t/ rather than /d/ percepts. The VOT region of perceptual cross‐over in labelling widened progressively from normal‐hearing adults to normal‐hearing children to hearing‐impaired children. Generally, longer VOTs were required to yield /t/ perception in the context of the DAD vowel than with the TAD vowel. These ‘vowel stem’ effects on VOT boundary were inconsistent for the hearing‐impaired children, and weaker for the normal‐hearing children than for the adults. These spoken stimuli produced results for VOT cue use that generally parallel those obtained in studies with synthetic stimuli.
L'on a examiné l'influence du délai de voisement (en anglais: le VOT) et des caractéristiques de l'attaque des voyelles sur la perception du contraste de voisement des occlusives initiales chez des enfants déficients auditifs, et des enfants et des adultes à l'audition normale. Les auditeurs ont dû identifier des stimulus DAD’–‘TAD’ prononcés, dont les caractéristiques de dêlais de voisement et d'attaque des voyelles étaient contrôlêes. Seuls 6 des 16 enfants déficients auditifs ont identifié correctement les stimulus exemplaires DAD et TAD utilisés comme extrêmités des continuums des délais de voisement. Pour ce groupe de 6 enfants, il a fallu un délai de voisement plus long que pour les auditeurs normaux pour obtenir des perceptions de /t/ plutôt que de /d/. La zone des délais de voisement résultant en un passage perceptif de l'un à l'autre s'est élargie progressivement des adultes jouissant d'une audition normale aux enfants jouissant d'une audition normale jusqu'aux enfants déficients auditifs. En général, il a fallu des délais de voisement plus longs pour obtenir une perception de /t/ dans le contexte de la voyelle de DAD que dans la voyelle de TAD. Ces effets de ‘racine vocalique’ sur la frontière de délai de voisement n'êtaient pas systématiques chez les enfants déficients auditifs, et ils étaient plus faibles chez les enfants à l'audition normale que les adultes à l'audition normale. Les résultats de ces stimulus parlés pour l'utilisation du repérage du délai de voisement correspondent en général à ceux obtenus dans des études avec des stimulus synthétiques. Der Einfluß der ‘voice‐onset time’ (VOT = Stimmeinsatz relativ zur Verschlußlösung) und der Eigenschaften des Vokaleinsatzes auf die Perzeption der Stimmhaftigkeitsopposition intialer Plosive wurde bei hörbehinderten Kindern und bei normalhörenden Kindern und Erwachsenen untersucht. ...
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