Cited by 231Reading and Literacy DevelopmentNeurobiology of Language and BilingualismVisual perception and processing mechanisms

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Dissociation of Normal Feature Analysis and Deficient Processing of Letter-strings in Dyslexic Adults

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Helenius, P.·1999·Cerebral Cortex

DOI 10.1093/cercor/9.5.476

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Abstract

Neuroimaging studies have revealed that the functional organization of reading differs between developmentally dyslexic and non-impaired individuals. However, it is not clear how early in the reading process the differences between fluent and dyslexic readers start to emerge. We studied cortical activity of ten dyslexic adults using magnetoencephalography (MEG), as they silently read words or viewed symbol-strings which were clearly visible or degraded with Gaussian noise. This method has previously been used to dissociate between analysis of local features and pre-lexical word processing in fluent adult readers. Signals peaking around 100 ms after stimulus onset and originating in the postero-medial extrastriate cortex were associated with increasing local luminance contrast in the noise patches. These early visual responses were similar in dyslexic and non-impaired readers. In contrast, the letter-string-specific responses peaking around 150 ms predominantly in the left inferior occipito-temporal cortex in fluent readers were undetectable in dyslexic readers. Thus, while the early visual processing seems intact in dyslexic adults, the pattern of cortical activation starts to differ from that of fluent readers at the point where letter-string-specific signals first emerge during reading.

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Authors: Helenius, P.
Corresponding author: Helenius, P.
ORCID: Helenius, P.
Venue: Cerebral Cortex
Publisher: Oxford University Press (OUP)
Published: 1999-07-01
Volume: 9
Issue: 5
Pages: 476-483
ISSN: 1047-3211 (ISSN-L)
1460-2199
DOI: 10.1093/cercor/9.5.476
OpenAlex: W2136257607
Cited by: 231
References: 50
Citations by year: 2026: 1 · 2025: 1 · 2024: 2 · 2023: 3 · 2022: 7 · 2021: 6 · 2020: 6 · 2019: 7 · 2018: 5 · 2017: 5 · 2016: 4 · 2015: 8 · 2014: 10 · 2013: 17 · 2012: 11
FWCI: 17.22
Type: journal article
Language: en
Open access: green
doi.org
Locations: Cerebral Cortex (publishedVersion)
PubMed (publishedVersion)
University of Birmingham Research Portal (University of Birmingham) (submittedVersion)
Newcastle University ePrints (Newcastle Univesity)
Topics: Social Sciences › Psychology › Developmental and Educational Psychology › Reading and Literacy Development
Life Sciences › Neuroscience › Cognitive Neuroscience › Neurobiology of Language and Bilingualism
Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
Keywords: developmental dyslexia, reading, early visual processing, luminance contrast, extrastriate cortex, magnetoencephalography, cortical activation
MeSH terms: Adult, Brain, Dyslexia, Female, Humans, Male, Mental Processes, Reading, Reference Values, Magnetoencephalography, Case-Control Studies

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Dissociation of Normal Feature Analysis and Deficient Processing of Letter-strings in Dyslexic Adults

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