Cited by 1,954Reading and Literacy DevelopmentVisual perception and processing mechanismsNeurobiology of Language and Bilingualism

The visual word form area

Cohen, Laurent, Dehaene, Stanislas, Naccache, Lionel, Lehéricy, Stéphane, Dehaene-Lambertz, Ghislaine, Hénaff, Marie-Anne, Michel, François·2000·Brain

Abstract

A standard model of word reading postulates that visual information is initially processed by occipitotemporal areas contralateral to the stimulated hemifield, from whence it is subsequently transferred to the visual word form (VWF) system, a left inferior temporal region specifically devoted to the processing of letter strings. For stimuli displayed in the left visual field, this transfer proceeds from the right to the left hemisphere through the posterior portion of the corpus callosum. In order to characterize the spatial and temporal organization of these processes, reading tasks with split-field presentation were performed by five control subjects and by two patients suffering from left hemialexia following posterior callosal lesions. The subjects' responses were studied using behavioural measures and functional brain imaging techniques, providing both high spatial resolution (functional MRI, fMRI) and high temporal resolution (high-density event-related potentials, ERPs). Early visual processing was revealed as activations contralateral to stimulation, located by fMRI in the inferior occipitotemporal region and presumably coincident with area V4. A negative wave occurring 150-160 ms post-stimulus, also strictly contralateral to stimulation, was recorded over posterior electrodes. In contrast with these hemifield-dependent effects, the VWF system was revealed as a strictly left-hemispheric activation which, in control subjects, was identical for stimuli presented in the left or in the right hemifield and was located in the middle portion of the left fusiform gyrus. The electrical signature of the VWF system consisted of a unilateral sharp negativity, recorded 180-200 ms post-stimulus over left inferior temporal electrodes. In callosal patients, due to the inability of visual information to pass across the posterior part of the corpus callosum, the VWF system was activated only by stimuli presented in the right visual field. Similarly, a significant influence of the word/non-word status on ERPs recorded over the left hemisphere was discernible for either hemifield in controls, while it affected only right-hemifield stimuli in callosal patients. These findings provide direct support for the main components of the classical model of reading and help specify their timing and cerebral substrates.

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Crossref · 10.1093/brain/123.2.291

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  • Striem-Amit et al. (2012b) found VWFA was activated in the blind when they processed letter soundscapes, following a 2 h training session.

    “The Visual Form Word Area (VWFA; Cohen et al., 2000; Sigurdardottir et al., 2015) was activated in the blind when they processed letter soundscapes, following a 2 h training session (see also Reich et al., 2011).”

    From Designing sensory-substitution devices: Principles, pitfalls and potential1 (2016) · cites this paper as Cohen et al., 2000

  • The left occipitotemporal cortex houses abstract representations of visual words.

    “The strongest and most influential claim was that the left occipitotemporal cortex housed abstract representations of visual words (Cohen et al., 2000; Dehaene et al., 2001).”
  • Brain imaging studies reliably localize a region of visual cortex that is especially responsive to visual words.

    “Brain imaging studies reliably localize a region of visual cortex that is especially responsive to visual words.”
  • This finding is robust enough to identify a significant peak of activation in over 90% of individual subject scans, with a standard deviation of <5 mm.

    “This finding is robust enough to identify a significant peak of activation in over 90% of individual subject scans, with a standard deviation of , 5 mm [8-11] (Fig. 1).”
  • fMRI responses to words versus control stimuli in the VWFA are equivalent across both visual fields.

    “In the VWFA, however, fMRI responses to words versus control stimuli are equivalent across both visual fields [9] (Fig. 1b).”

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Authors
Cohen, L., Dehaene, S., Naccache, L., Lehéricy, S., Dehaene-Lambertz, G., Hénaff, M.-A., & Michel, F.
Affiliations
Inserm (FR)
Corresponding author
Cohen, Laurent
Venue
Brain
Published
2000-02
Volume
123
Issue
2
Pages
291-307
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W1866095408
Cited by
1,954
References
78
Citations by year
2026: 35 · 2025: 61 · 2024: 63 · 2023: 56 · 2022: 63 · 2021: 94 · 2020: 114 · 2019: 76 · 2018: 80 · 2017: 86 · 2016: 78 · 2015: 104 · 2014: 135 · 2013: 106 · 2012: 105
FWCI
49.44
Type
journal article
Language
en
Open access
closed
Locations
  • Brain (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Social Sciences › Psychology › Developmental and Educational Psychology › Reading and Literacy Development
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neurobiology of Language and Bilingualism
Keywords
visual word form area, word reading, corpus callosum, fusiform gyrus, area V4, event-related potentials, functional MRI, corpus callosotomy, reading models
MeSH terms
Adult, Corpus Callosum, Electroencephalography, Evoked Potentials, Female, Humans, Functional Laterality, Magnetic Resonance Imaging, Male, Mental Processes, Occipital Lobe, Reading, Temporal Lobe, Visual Perception, Case-Control Studies

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