framing effects reveal discrete lexical-semantic and sublexical procedures in reading: an fmri study
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ID: 250705
2015
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Abstract
According to the dual-route model, a printed string of letters can be processed by either a grapheme-to-phoneme conversion (GPC) route or a lexical-semantic route. Although meta-analyses of the imaging literature support the existence of distinct but interacting reading procedures, individual neuroimaging studies that explored neural correlates of reading yielded inconclusive results. We used a list-manipulation paradigm to provide a fresh empirical look at this issue and to isolate specific areas that underlie the two reading procedures. In a lexical condition, we embedded disyllabic Italian words (target stimuli) in lists of either loanwords or trisyllabic Italian words with an unpredictable stress position. In a GPC condition, similar target stimuli were mixed into lists of pseudowords. The procedure was designed to induce participants to emphasize a lexical-semantic or a GPC reading procedure, while controlling for possible linguistic confounds and keeping the reading task requirements stable across the two conditions. Thirty-three adults participated in the behavioral study, and 20 other adult participants were included in the fMRI study. At the behavioral level, we found sizeable effects of the framing manipulations that included slower voice onset times for stimuli in the pseudoword frames. At the functional anatomical level, the occipital and temporal regions, and the intraparietal sulcus were specifically activated when subjects were reading target words in a lexical frame. The inferior parietal and anterior fusiform cortex was specifically activated in the GPC condition. These patterns of activation represented a valid classifying model of fMRI images associated with target reading in both frames in the multi-voxel pattern analyses. Further activations were shared by the two procedures in the occipital and inferior parietal areas, in the premotor cortex, in the frontal regions and the left supplementary motor area. These regions are most likely involved in either early input or late output processes.
| Reference Key |
edanelli2015frontiersframing
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| Authors | ;Laura eDanelli;Marco eMarelli;Manuela eBerlingeri;Marco eTettamanti;Maurizio eSberna;Eraldo ePaulesu;Eraldo ePaulesu;Claudio eLuzzatti |
| Journal | accounts of chemical research |
| Year | 2015 |
| DOI |
10.3389/fpsyg.2015.01328
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| URL | |
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