Voice onset time perception in Japanese aphasic patients

Itoh, Motonobu; Tatsumi, Itaru F.; Sasanuma, Sumiko; Fukusako, Yoko

doi:10.1016/0093-934x(86)90092-1

Cited by 13 publications

(7 citation statements)

References 6 publications

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“…None of the right-hemispheredamaged patients exhibited any perceptual difficulties. Itoh et al (1986) reported a similar result for Japanese-speaking Wernicke's aphasics. Wernicke's aphasics produced less steep categorical functions and made more confusions in identifying a /ga/-/ka/ continuum than controls.…”

Section: Phonological Level Of Processingsupporting

confidence: 68%

Relating Selective Brain Damage to Impairments with Voicing Contrasts

Ravizza

2001

Brain and Language

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Section: Phonological Level Of Processingsupporting

confidence: 68%

Relating Selective Brain Damage to Impairments with Voicing Contrasts

Ravizza

2001

Brain and Language

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“…It has been assumed that the perception of the VOT is under the control of the left hemisphere (Liberman et al, 1952;Lane, 1965, Fujisaki andKawashima, 1971;Studdert-Kennedy, 1976;Ades, 1977;Miller, 1977;Pastore et al, 1977;Stevens, 1981;Kuhl and Padden, 1983;Macmillan, 1987). Several studies, however, have reported slight deficits in VOT discrimination in patients with damage to the left hemisphere (Oscar-Berman et al, 1975;Basso et al, 1977;Blumstein et al, 1977;Miceli et al, 1978;Itoh et al, 1986). Electrophysiological data suggest that the perception of the VOT is controlled by several cortical processes -some of which are restricted to the right hemisphere and others of which are common to both hemispheres (Molfese, 1978).…”

Section: Introductionmentioning

confidence: 98%

Specialization of Left Auditory Cortex for Speech Perception in Man Depends on Temporal Coding

1999

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Speech perception requires cortical mechanisms capable of analysing and encoding successive spectral (frequency) changes in the acoustic signal. To study temporal speech processing in the human auditory cortex, we recorded intracerebral evoked potentials to syllables in right and left human auditory cortices including Heschl's gyrus (HG), planum temporale (PT) and the posterior part of superior temporal gyrus (area 22). Natural voiced /ba/, /da/, /ga/) and voiceless (/pa/, /ta/, /ka/) syllables, spoken by a native French speaker, were used to study the processing of a specific temporally based acoustico-phonetic feature, the voice onset time (VOT). This acoustic feature is present in nearly all languages, and it is the VOT that provides the basis for the perceptual distinction between voiced and voiceless consonants. The present results show a lateralized processing of acoustic elements of syllables. First, processing of voiced and voiceless syllables is distinct in the left, but not in the right HG and PT. Second, only the evoked potentials in the left HG, and to a lesser extent in PT, reflect a sequential processing of the different components of the syllables. Third, we show that this acoustic temporal processing is not limited to speech sounds but applies also to non-verbal sounds mimicking the temporal structure of the syllable. Fourth, there was no difference between responses to voiced and voiceless syllables in either left or right areas 22. Our data suggest that a single mechanism in the auditory cortex, involved in general (not only speech-specific) temporal processing, may underlie the further processing of verbal (and non-verbal) stimuli. This coding, bilaterally localized in auditory cortex in animals, takes place specifically in the left HG in man. A defect of this mechanism could account for hearing discrimination impairments associated with language disorders.

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“…Aphasia develops most frequently after damage to the left hemisphere. Aphasics exhibit a specific deficit in the phonetic coding of acoustic speech input (Blumstein, Baker, & Goodglass, 1977;Blumstein, Cooper, Zurif, & Caramazza, 1977;Gandour & Dardarananda, 1982;Itoh, Tatsumi, Sasanuma, & Fukusako, 1986;Varney, 1984). And the syndrome of pure word deafness, which includes a deficit of phonetic coding, only occurs if the fibre tracts between the auditory cortices of both hemispheres and the Wernicke centre in the left hemisphere are disconnected (Auerbach, Allard, Naeser, Alexander, & Albert, 1982;Bauer & Rubens, 1985;Coslett, Brashear, & Heilman, 1984;Phillips, 1989).…”

mentioning

confidence: 96%

Left and Right Hemifield Advantages of Fusions and Combinations in Audiovisual Speech Perception

Diesch

1995

The Quarterly Journal of Experimental Psychology Section A

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If a place-of-articulation contrast is created between the auditory and the visual component syllables of videotaped speech, frequently the syllable that listeners report they have heard differs phonetically from the auditory component. These "McGurk effects", as they have come to be called, show that speech perception may involve some kind of intermodal process. There are two classes of these phenomena: fusions and combinations. Perception of the syllable /da/ when auditory /ba/ and visual /ga/ are presented provides a clear example of the former, and perception of the string /bga/ after presentation of auditory /ga/ and visual /ba/ an unambiguous instance of the latter. Besides perceptual fusions and combinations, hearing visually presented component syllables also shows an influence of vision on audition. It is argued that these "visual" responses arise from basically the same underlying processes that yield fusions and combinations, respectively. In the present study, the visual component of audiovisually incongruous CV-syllables was presented in the left and the right visual hemifield, respectively. Audiovisual fusion responses showed a left hemifield advantage, and audiovisual combination responses a right hemifield advantage. This finding suggests that the process of audiovisual integration differs between audiovisual fusions and combinations and, furthermore, that the two cerebral hemispheres contribute differentially to the two classes of response.

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Voice onset time perception in Japanese aphasic patients

Cited by 13 publications

References 6 publications

Relating Selective Brain Damage to Impairments with Voicing Contrasts

Relating Selective Brain Damage to Impairments with Voicing Contrasts

Specialization of Left Auditory Cortex for Speech Perception in Man Depends on Temporal Coding

Left and Right Hemifield Advantages of Fusions and Combinations in Audiovisual Speech Perception

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