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Semantic coding in the occipital cortex of early blind individuals
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In: https://hal.archives-ouvertes.fr/hal-02018272 ; 2019 (2019)
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A mesial-to-lateral dissociation for orthographic processing in the visual cortex
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In: ISSN: 0027-8424 ; EISSN: 1091-6490 ; Proceedings of the National Academy of Sciences of the United States of America ; https://hal.sorbonne-universite.fr/hal-02352101 ; Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2019, 116 (43), pp.21936-21946. ⟨10.1073/pnas.1904184116⟩ (2019)
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Abstract:
International audience ; Efficient reading requires a fast conversion of the written word to both phonological and semantic codes. We tested the hypothesis that, within the left occipitotemporal cortical regions involved in visual word recognition, distinct subregions harbor slightly different orthographic codes adapted to those 2 functions. While the lexico-semantic pathway may operate on letter or open-bigram information, the phonological pathway requires the identification of multiletter graphemes such as "ch" or "ou" in order to map them onto phonemes. To evaluate the existence of a specific stage of graphemic encoding, 20 adults performed lexical decision and naming tasks on words and pseudowords during functional MRI. Graphemic encoding was facilitated or disrupted by coloring and spacing the letters either congruently with multiletter graphemes (ch-ai-r) or incongruently with them (c-ha-ir). This manipulation affected behavior, primarily during the naming of pseudowords, and modulated brain activity in the left midfusiform sulcus, at a site medial to the classical visual word form area (VWFA). This putative grapheme-related area (GRA) differed from the VWFA in being preferentially connected functionally to dorsal parietal areas involved in letter-by-letter reading, while the VWFA showed effects of lexicality and spelling-to-sound regularity. Our results suggest a partial dissociation within left occipitotemporal cortex: the midfusiform GRA would encode orthographic information at a sublexical graphemic level, while the lateral occipitotemporal VWFA would contribute primarily to direct lexico-semantic access.
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Keyword:
[SDV.NEU.SC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Cognitive Sciences; complex graphemes; grapheme processing; Reading; visual word form area
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URL: https://hal.sorbonne-universite.fr/hal-02352101
https://hal.sorbonne-universite.fr/hal-02352101/document
https://hal.sorbonne-universite.fr/hal-02352101/file/Bouhali%20et%20al.%20-%202019%20-%20A%20mesial-to-lateral%20dissociation%20for%20orthographic%20.pdf
https://doi.org/10.1073/pnas.1904184116
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The cerebral bases of the bouba-kiki effect
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In: ISSN: 1053-8119 ; EISSN: 1095-9572 ; NeuroImage ; https://hal.sorbonne-universite.fr/hal-02003299 ; NeuroImage, Elsevier, 2019, 186, pp.679-689. ⟨10.1016/j.neuroimage.2018.11.033⟩ (2019)
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When colours split from objects: The disconnection of colour perception from colour language and colour knowledge
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A mesial-to-lateral dissociation for orthographic processing in the visual cortex
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