Cited by 400Reading and Literacy DevelopmentNeurobiology of Language and BilingualismVisual perception and processing mechanisms

Visual Word Recognition in the Left and Right Hemispheres: Anatomical and Functional Correlates of Peripheral Alexias

Cohen, L.·2003·Cerebral Cortex

Abstract

According to a simple anatomical and functional model of word reading, letters displayed in one hemifield are first analysed through a cascade of contralateral retinotopic areas, which compute increasingly abstract representations. Eventually, an invariant representation of letter identities is created in the visual word form area (VWFA), reproducibly located within the left occipito-temporal sulcus. The VWFA then projects to structures involved in phonological or lexico-semantic processing. This model yields detailed predictions on the reading impairments that may follow left occipitotemporal lesions. Those predictions were confronted to behavioural, anatomical and functional MRI data gathered in normals and in patients suffering from left posterior cerebral artery infarcts. In normal subjects, alphabetic stimuli activated both the VWFA and the right-hemispheric symmetrical region (R-VWFA) relative to fixation, but only the VWFA showed a preference for alphabetic strings over simple chequerboards. The comparison of normalized brain lesions with reading-induced activations showed that the critical lesion site for the classical syndrome of pure alexia can be tightly localized to the VWFA. Reading impairments resulting from deafferentation of an intact VWFA from right- or left-hemispheric input were dissected using the same methods, shedding light on the connectivity of the VWFA. Finally, the putative role of right-hemispheric processing in the letter-by-letter reading strategy was clarified. In a letter-by-letter reader, the R-VWFA assumed some of the functional properties normally specific to the VWFA. These data corroborate our initial model of normal word perception and underline that an alternative right-hemispheric pathway can underlie functional recovery from alexia.

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Crossref · 10.1093/cercor/bhg079

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  • Pure alexia patients are able to identify single letters, and develop letter-by-letter reading strategies resulting in reading latencies that increase by hundreds of milliseconds for each additional letter.

    “In contrast to global alexia, PA patients are able to identify single letters, and develop letter-by-letter reading strategies resulting in reading latencies that increase by hundreds of milliseconds for each additional letter [49].”
  • This lesion overlap region was larger than the VWFA strictly defined but precisely encompassed the region of activation to words identified in fMRI studies of reading.

    “Although this region was admittedly larger than the VWFA strictly defined, it precisely encompassed the region of activation to words identified in fMRI studies of reading (Cohen et al., 2003).”

    From Specialization within the ventral stream: the case for the visual word form area (2004) · cites this paper as Cohen et al., 2003

  • The effect holds quite generally, at least in passive viewing conditions or with tasks that require equal attention to words and to consonant strings; no difference, or even a reversal, can be observed if the task is more difficult to perform with consonant strings than with words.

    “This holds quite generally, at least in passive viewing conditions or with tasks that require equal attention to words and to consonant strings; no difference, or even a reversal, can be observed if the task is more difficult to perform with consonant strings than with words (Cohen et al., 2003).”

    From Specialization within the ventral stream: the case for the visual word form area (2004) · cites this paper as Cohen et al., 2003

  • Binder and Mohr (1992), Damasio and Damasio (1983), and Cohen et al. (2003) agree on the lateral edge of the left fusiform gyrus as associated with pure alexia.

    “Such work was done by Binder and Mohr (1992), Damasio and Damasio (1983), and more recently by our group (Cohen et al., 2003), with a good agreement of these studies on the lateral edge of the left fusiform gyrus.”

    From Specialization within the ventral stream: the case for the visual word form area (2004) · cites this paper as Cohen et al., 2003

  • In the authors' recent work, a similar region of lesion overlap in the fusiform gyrus was found.

    “In our recent work, we also found a similar region of lesion overlap in the fusiform gyrus.”

    From Specialization within the ventral stream: the case for the visual word form area (2004) · cites this paper as Cohen et al., 2003

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Authors
Cohen, L.
Affiliations
Assistance Publique – Hôpitaux de Paris (FR)
Corresponding author
Cohen, L.
Venue
Cerebral Cortex
Published
2003-12-01
Volume
13
Issue
12
Pages
1313-1333
ISSN
  • 1047-3211 (ISSN-L)
  • 1460-2199
OpenAlex
W2113185660
Cited by
400
References
100
Citations by year
2026: 4 · 2025: 12 · 2024: 8 · 2023: 6 · 2022: 15 · 2021: 13 · 2020: 9 · 2019: 31 · 2018: 17 · 2017: 14 · 2016: 11 · 2015: 21 · 2014: 22 · 2013: 26 · 2012: 28
FWCI
26.84
Type
journal article
Language
en
Open access
closed
Locations
  • Cerebral Cortex (publishedVersion)
  • PubMed (publishedVersion)
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
visual word recognition, pure alexia, visual word form area, hemispheric lateralization, posterior cerebral artery infarction, deafferentation, letter-by-letter reading, reading disorders
MeSH terms
Adult, Aged, Brain Mapping, Cerebral Cortex, Dyslexia, Acquired, Female, Humans, Language, Magnetic Resonance Imaging, Male, Middle Aged, Pattern Recognition, Visual, Reading, Visual Perception, Infarction, Posterior Cerebral Artery

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