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REGIONAL CEREBRAL BLOOD FLOW DURING SIGN LANGUAGE PERCEPTION

REGIONAL CEREBRAL BLOOD FLOW DURING SIGN LANGUAGE PERCEPTION. DEAF & HEARING SUBJECTS WITH DEAF PARENTS COMPARED. Overview. Goals and Study The Subjects Researched on The Experimental Method Results of the Experiment. Goals and Study.

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REGIONAL CEREBRAL BLOOD FLOW DURING SIGN LANGUAGE PERCEPTION

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  1. REGIONAL CEREBRAL BLOOD FLOW DURING SIGN LANGUAGE PERCEPTION DEAF & HEARING SUBJECTS WITH DEAF PARENTS COMPARED

  2. Overview • Goals and Study • The Subjects Researched on • The Experimental Method • Results of the Experiment

  3. Goals and Study • find out similarities between signed and spoken language • both seem to activate much the same regions in the brain • more occipital activation in sign language • sign language seems to involve the right hemisphere (true?) • study: compare sign language lateralization and localization between hearing and deaf children of deaf parents

  4. The Subjects Researched on • 6 deaf subjects; 9 hearing subject • all had deaf parents • no psychiatric history • Swedish sign language as mother tongue • all were right-handed

  5. The Experimental Method • high resolution rCBF • Swedish novel was translated into Swedish sign language • presented by a deaf man signing • instruction: focus on story • retell story • Activation was compared during sign language and rest

  6. Results of the Experiment • both groups show a high bifrontal activation during rest • deaf group exhibited more activation in the parieto-occipital lobe (highly significant) • hearing signers used more temporal areas • it seems that deafness and not the early learning of sign language that leads to enhanced right hemisphere activation

  7. Results of the Experiment • enhanced right hemisphere parieto-occipital activation in this group is an effect of a lack of auditory stimulation and of early learning of a visual-spatial language

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