Altered hemispheric asymmetry during word processing in dyslexic children: an event-related potential study
The present event-related potential study aimed at finding neurophysiological correlates of inadequate reading performances in developmental dyslexia. By using the same set of words in different linguistic tasks, we found variations of cortical asymmetry between dyslexic individuals and controls sta...
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| Veröffentlicht in: | Neuroreport 2006-03, Vol.17 (4), p.429-433 |
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| creator | Penolazzi, Barbara Spironelli, Chiara Vio, Claudio Angrilli, Alessandro |
| description | The present event-related potential study aimed at finding neurophysiological correlates of inadequate reading performances in developmental dyslexia. By using the same set of words in different linguistic tasks, we found variations of cortical asymmetry between dyslexic individuals and controls starting with the N420, a component supposed to index the phonological processing during reading. Whereas in controls this component was left lateralized, in disabled readers it was more distributed across hemispheres. The observed lack of lateralization in dyslexic individuals was also found in the later slow negative wave that developed in the 700 to 1500-ms time interval. We postulate that the altered asymmetry is related to an impairment of the grapheme–phoneme conversion mechanism. The findings would therefore support the hypothesis of a phonological deficit underlying this learning disability. |
| doi_str_mv | 10.1097/01.wnr.0000203350.99256.7d |
| format | Article |
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The findings would therefore support the hypothesis of a phonological deficit underlying this learning disability.</description><identifier>ISSN: 0959-4965</identifier><identifier>EISSN: 1473-558X</identifier><identifier>DOI: 10.1097/01.wnr.0000203350.99256.7d</identifier><identifier>PMID: 16514371</identifier><language>eng</language><publisher>Hagerstown, MD: Lippincott Williams & Wilkins, Inc</publisher><subject>Adolescent ; Biological and medical sciences ; Cerebral Cortex - physiology ; Child ; Disorders of higher nervous function. Focal brain diseases. Central vestibular syndrome and deafness. Brain stem syndromes ; Dyslexia - physiopathology ; Evoked Potentials - physiology ; Female ; Functional Laterality - physiology ; Humans ; Language ; Language Tests ; Male ; Medical sciences ; Nervous system (semeiology, syndromes) ; Neural Pathways - physiology ; Neurology ; Reaction Time - physiology ; Reading ; Verbal Behavior - physiology</subject><ispartof>Neuroreport, 2006-03, Vol.17 (4), p.429-433</ispartof><rights>2006 Lippincott Williams & Wilkins, Inc.</rights><rights>2006 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4236-7ed0c29bdba2bbbf376febf9ea9576a3ed920710ca68754c51f8b3f3de72827a3</citedby><cites>FETCH-LOGICAL-c4236-7ed0c29bdba2bbbf376febf9ea9576a3ed920710ca68754c51f8b3f3de72827a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27903,27904</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=17568487$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/16514371$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Penolazzi, Barbara</creatorcontrib><creatorcontrib>Spironelli, Chiara</creatorcontrib><creatorcontrib>Vio, Claudio</creatorcontrib><creatorcontrib>Angrilli, Alessandro</creatorcontrib><title>Altered hemispheric asymmetry during word processing in dyslexic children: an event-related potential study</title><title>Neuroreport</title><addtitle>Neuroreport</addtitle><description>The present event-related potential study aimed at finding neurophysiological correlates of inadequate reading performances in developmental dyslexia. By using the same set of words in different linguistic tasks, we found variations of cortical asymmetry between dyslexic individuals and controls starting with the N420, a component supposed to index the phonological processing during reading. Whereas in controls this component was left lateralized, in disabled readers it was more distributed across hemispheres. The observed lack of lateralization in dyslexic individuals was also found in the later slow negative wave that developed in the 700 to 1500-ms time interval. We postulate that the altered asymmetry is related to an impairment of the grapheme–phoneme conversion mechanism. The findings would therefore support the hypothesis of a phonological deficit underlying this learning disability.</description><subject>Adolescent</subject><subject>Biological and medical sciences</subject><subject>Cerebral Cortex - physiology</subject><subject>Child</subject><subject>Disorders of higher nervous function. Focal brain diseases. Central vestibular syndrome and deafness. Brain stem syndromes</subject><subject>Dyslexia - physiopathology</subject><subject>Evoked Potentials - physiology</subject><subject>Female</subject><subject>Functional Laterality - physiology</subject><subject>Humans</subject><subject>Language</subject><subject>Language Tests</subject><subject>Male</subject><subject>Medical sciences</subject><subject>Nervous system (semeiology, syndromes)</subject><subject>Neural Pathways - physiology</subject><subject>Neurology</subject><subject>Reaction Time - physiology</subject><subject>Reading</subject><subject>Verbal Behavior - physiology</subject><issn>0959-4965</issn><issn>1473-558X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkctq3DAUQEVpaaZpf6GIQruzo4clWdmF0BcEskmgOyFL17Ub2Z5Kdqf--8qZgVlWC4krzn1xEPpASUmJVleElocxliQfRjgXpNSaCVkq_wLtaKV4IUT94yXaES10UWkpLtCblH5lXhNav0YXVApacUV36OkmzBDB4w6GPu07iL3DNq3DAHNcsV9iP_7Ehyl6vI-Tg5S2uB-xX1OAvxl2XR98hPEa2xHDHxjnIkKwc665n-Yc9jbgNC9-fYtetTYkeHd6L9Hjl88Pt9-Ku_uv329v7gpXMS4LBZ44phvfWNY0TcuVbKFpNVgtlLQcvGZEUeKsrJWonKBt3fCWe1CsZsryS_TpWDdP_HuBNJu8moMQ7AjTkoxUilZS6f-CjAhZ15xk8PoIujilFKE1-9gPNq6GErM5MYSa7MScnZhnJ0b5nPz-1GVpBvDn1JOEDHw8ATY5G9poR9enM6fyFFWtMlcducO0SUtPYTlANB3YMHfPrTe0YIRIwvNdbD-S_wPKiKiv</recordid><startdate>20060320</startdate><enddate>20060320</enddate><creator>Penolazzi, Barbara</creator><creator>Spironelli, Chiara</creator><creator>Vio, Claudio</creator><creator>Angrilli, Alessandro</creator><general>Lippincott Williams & Wilkins, Inc</general><general>Lippincott Williams and Wilkins</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TK</scope><scope>7X8</scope></search><sort><creationdate>20060320</creationdate><title>Altered hemispheric asymmetry during word processing in dyslexic children: an event-related potential study</title><author>Penolazzi, Barbara ; Spironelli, Chiara ; Vio, Claudio ; Angrilli, Alessandro</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4236-7ed0c29bdba2bbbf376febf9ea9576a3ed920710ca68754c51f8b3f3de72827a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>Adolescent</topic><topic>Biological and medical sciences</topic><topic>Cerebral Cortex - physiology</topic><topic>Child</topic><topic>Disorders of higher nervous function. Focal brain diseases. Central vestibular syndrome and deafness. Brain stem syndromes</topic><topic>Dyslexia - physiopathology</topic><topic>Evoked Potentials - physiology</topic><topic>Female</topic><topic>Functional Laterality - physiology</topic><topic>Humans</topic><topic>Language</topic><topic>Language Tests</topic><topic>Male</topic><topic>Medical sciences</topic><topic>Nervous system (semeiology, syndromes)</topic><topic>Neural Pathways - physiology</topic><topic>Neurology</topic><topic>Reaction Time - physiology</topic><topic>Reading</topic><topic>Verbal Behavior - physiology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Penolazzi, Barbara</creatorcontrib><creatorcontrib>Spironelli, Chiara</creatorcontrib><creatorcontrib>Vio, Claudio</creatorcontrib><creatorcontrib>Angrilli, Alessandro</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Neurosciences Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>Neuroreport</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Penolazzi, Barbara</au><au>Spironelli, Chiara</au><au>Vio, Claudio</au><au>Angrilli, Alessandro</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Altered hemispheric asymmetry during word processing in dyslexic children: an event-related potential study</atitle><jtitle>Neuroreport</jtitle><addtitle>Neuroreport</addtitle><date>2006-03-20</date><risdate>2006</risdate><volume>17</volume><issue>4</issue><spage>429</spage><epage>433</epage><pages>429-433</pages><issn>0959-4965</issn><eissn>1473-558X</eissn><abstract>The present event-related potential study aimed at finding neurophysiological correlates of inadequate reading performances in developmental dyslexia. By using the same set of words in different linguistic tasks, we found variations of cortical asymmetry between dyslexic individuals and controls starting with the N420, a component supposed to index the phonological processing during reading. Whereas in controls this component was left lateralized, in disabled readers it was more distributed across hemispheres. The observed lack of lateralization in dyslexic individuals was also found in the later slow negative wave that developed in the 700 to 1500-ms time interval. We postulate that the altered asymmetry is related to an impairment of the grapheme–phoneme conversion mechanism. The findings would therefore support the hypothesis of a phonological deficit underlying this learning disability.</abstract><cop>Hagerstown, MD</cop><pub>Lippincott Williams & Wilkins, Inc</pub><pmid>16514371</pmid><doi>10.1097/01.wnr.0000203350.99256.7d</doi><tpages>5</tpages></addata></record> |
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| subjects | Adolescent Biological and medical sciences Cerebral Cortex - physiology Child Disorders of higher nervous function. Focal brain diseases. Central vestibular syndrome and deafness. Brain stem syndromes Dyslexia - physiopathology Evoked Potentials - physiology Female Functional Laterality - physiology Humans Language Language Tests Male Medical sciences Nervous system (semeiology, syndromes) Neural Pathways - physiology Neurology Reaction Time - physiology Reading Verbal Behavior - physiology |
| title | Altered hemispheric asymmetry during word processing in dyslexic children: an event-related potential study |
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