Speech lateralization in deaf populations: Evidence for a developmental critical period

Marcotte, Ann C.; Morere, Donna A.

doi:10.1016/0093-934x(90)90008-5

Cited by 55 publications

(18 citation statements)

References 21 publications

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“…In one study, normally hearing adolescents and deaf adolescents who had acquired deafness after 3 years of age displayed left hemispheric dominance for productive language. However, congenitally deaf subjects and those with early acquired deafness (onset 6-36 months) showed atypical bilateral cerebral activity during productive language (27,28). Although recent EEG and fMRI studies have suggested lateralized processing for sounds in infants, they did not find a lateral difference in phonetic processing at an early age (29), opening the possibility for an influence of experience.…”

Section: Discussionmentioning

confidence: 62%

“…The songbird model may be relevant to the human case because it seems likely that both songbirds and humans have evolved the substrate for vocal learning by exploiting lateral differences in processing that are shared in the vertebrate lineage. Relevant human data are scarce, but they suggest that auditory experience could play a role in human lateralization (27)(28)(29). In humans, there is some evidence of a critical period during which experience with language is necessary to establish neural lateralization of speech production.…”

Section: Discussionmentioning

confidence: 99%

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Hemispheric differences in processing of vocalizations depend on early experience

Phan

Vicario

2010

Proc. Natl. Acad. Sci. U.S.A.

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An intriguing phenomenon in the neurobiology of language is lateralization: the dominant role of one hemisphere in a particular function. Lateralization is not exclusive to language because lateral differences are observed in other sensory modalities, behaviors, and animal species. Despite much scientific attention, the function of lateralization, its possible dependence on experience, and the functional implications of such dependence have yet to be clearly determined. We have explored the role of early experience in the development of lateralized sensory processing in the brain, using the songbird model of vocal learning. By controlling exposure to natural vocalizations (through isolation, song tutoring, and muting), we manipulated the postnatal auditory environment of developing zebra finches, and then assessed effects on hemispheric specialization for communication sounds in adulthood. Using bilateral multielectrode recordings from a forebrain auditory area known to selectively process species-specific vocalizations, we found that auditory responses to species-typical songs and long calls, in both male and female birds, were stronger in the right hemisphere than in the left, and that right-side responses adapted more rapidly to stimulus repetition. We describe specific instances, particularly in males, where these lateral differences show an influence of auditory experience with song and/or the bird's own voice during development.auditory | development | electrophysiology | lateralization | songbird

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Section: Discussionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Hemispheric differences in processing of vocalizations depend on early experience

Phan

Vicario

2010

Proc. Natl. Acad. Sci. U.S.A.

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“…This could explain the difference between the results of children educated with CS at home and those in contact with CS only at school. Several authors have discussed the existence of a critical period for the development of analytical language-speci®c processes (Emmorey, Bellugi, Friederici, & Horn, 1995;Locke, 1997;Marcotte & Morere, 1990;Mayberry, 1995;Mayberry & Eichen, 1991;Neville, 1991;Neville et al, 1997). Children exposed to CS only at school might not have received a suf®ciently consistent linguistic experience at an early age, especially before the age of 2 years.…”

Section: Discussionmentioning

confidence: 99%

The Rhyming Skills of Deaf Children Educated with Phonetically Augmented Speechreading

Charlier

Leybaert

2000

The Quarterly Journal of Experimental Psychology Section A

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Two experiments investigated whether profoundly deaf children's rhyming ability was determined by the linguistic input that they were exposed to in their early childhood. Children educated with Cued Speech (CS) were compared to other deaf children, educated orally or with sign language. In CS, speechreading is combined with manual cues that disambiguate it. The central hypothesis is that CS allows deaf children to develop accurate phonological representations, which, in turn, assist in the emergence of accurate rhyming abilities. Experiment 1 showed that the deaf children educated early with CS performed better at rhyme judgement than did other deaf children. The performance of early CS-users was not influenced by word spelling. Experiment 2 confirmed this result in a rhyme generation task. Taken together, results support the hypothesis that rhyming ability depends on early exposure to a linguistic input specifying all phonological contrasts, independently of the modality (visual or auditory) in which this input is perceived.

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“…By contrast, Panou and Sewell (1984) observed a RVF advantage in both hearing and deaf who were native signers, and Wilson (1983) obtained the standard RVF advantage for the hearing subjects, and no VF advantage for deaf educated with sign language. In the majority of these studies investigating hemispheric specialization in the deaf, auditory deprivation and linguistic deprivation were confounded (Conrad, 1979;Marcotte & Morere, 1990): deaf subjectsÕ lack of knowledge of the grammar and phonology of the language may explain their abnormal laterality patterns.…”

Section: Introductionmentioning

confidence: 99%

Lateralization effects during semantic and rhyme judgement tasks in deaf and hearing subjects

D'Hondt¹,

Leybaert²

2003

Brain and Language

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A visual hemifield experiment investigated hemispheric specialization among hearing children and adults and prelingually, profoundly deaf youngsters who were exposed intensively to Cued Speech (CS). Of interest was whether deaf CS users, who undergo a development of phonology and grammar of the spoken language similar to that of hearing youngsters, would display similar laterality patterns in the processing of written language. Semantic, rhyme, and visual judgement tasks were used. In the visual task no VF advantage was observed. A RVF (left hemisphere) advantage was obtained for both the deaf and the hearing subjects for the semantic task, supporting NevilleÕs claim that the acquisition of competence in the grammar of language is critical in establishing the specialization of the left hemisphere for language. For the rhyme task, however, a RVF advantage was obtained for the hearing subjects, but not for the deaf ones, suggesting that different neural resources are recruited by deaf and hearing subjects. Hearing the sounds of language may be necessary to develop left lateralised processing of rhymes.

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Speech lateralization in deaf populations: Evidence for a developmental critical period

Cited by 55 publications

References 21 publications

Hemispheric differences in processing of vocalizations depend on early experience

Hemispheric differences in processing of vocalizations depend on early experience

The Rhyming Skills of Deaf Children Educated with Phonetically Augmented Speechreading

Lateralization effects during semantic and rhyme judgement tasks in deaf and hearing subjects

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