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 Vol 4: Letter representations in writing: an fMRI adaptation approach.


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This article is from Frontiers in Psychology, volume 4.AbstractBehavioral and neuropsychological research in reading and spelling has provided evidence for the role of the following types of orthographic representations in letter writing: letter shapes, letter case, and abstract letter identities. We report on the results of an fMRI investigation designed to identify the neural substrates of these different representational types. Using an fMRI adaptation paradigm we examined the neural distribution of inhibition and release from inhibition in a letter-writing task in which, on every trial, participants produced three repetitions of the same letter and a fourth letter that was either identical to no-change trial or different from the previous three change trial. Change trials involved a change in the shape, case, and-or identity of the letter. After delineating the general letter writing network by identifying areas that exhibited significant neural adaptation effects on no-change trials, we used deconvolution analysis to examine this network for effects of release from inhibition on change trials. In this way we identified regions specifically associated with the representation of letter shape in the left SFS and SFG-pre-CG and letter identity in the left fusiform gyrus FG or both right cerebellum, left post-central gyrus post-CG, and left middle frontal gyrus MFG. No regions were associated with the representation of letter case. This study showcases an investigational approach that allows for the differentiation of the neurotopography of the representational types that are key to our ability to produce written language.



Autor: Dufor, Olivier; Rapp, Brenda

Fuente: https://archive.org/







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