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@ARTICLE{Heim:132059,
author = {Heim, Stefan and Weidner, Ralph and Overheidt, Ann-Christin
and Tholen, Nicole and Grande, M and Amunts, Katrin},
title = {{E}xperimental induction of reading difficulties in normal
readers provides novel insights into the neurofunctional
mechanisms of visual word recognition},
journal = {Brain structure $\&$ function},
volume = {219},
number = {2},
issn = {1863-2661},
address = {Berlin},
publisher = {Springer},
reportid = {FZJ-2013-01298},
pages = {461-471},
year = {2014},
abstract = {Phonological and visual dysfunctions may result in reading
deficits like those encountered in developmental dyslexia.
Here, we use a novel approach to induce similar reading
difficulties in normal readers in an event-related fMRI
study, thus systematically investigating which brain regions
relate to different pathways relating to
orthographic-phonological (e.g. grapheme-to-phoneme
conversion, GPC) vs. visual processing. Based upon a
previous behavioural study (Tholen et al. 2011), the
retrieval of phonemes from graphemes was manipulated by
lowering the identifiability of letters in familiar vs.
unfamiliar shapes. Visual word and letter processing was
impeded by presenting the letters of a word in a moving,
non-stationary manner. FMRI revealed that the visual
condition activated cytoarchitectonically defined area hOC5
in the magnocellular pathway and area 7A in the right mesial
parietal cortex. In contrast, the grapheme manipulation
revealed different effects localised predominantly in
bilateral inferior frontal gyrus (left cytoarchitectonic
area 44; right area 45) and inferior parietal lobule
(including areas PF/PFm), regions that have been
demonstrated to show abnormal activation in dyslexic as
compared to normal readers. This pattern of activation bears
close resemblance to recent findings in dyslexic samples
both behaviourally and with respect to the neurofunctional
activation patterns. The novel paradigm may thus prove
useful in future studies to understand reading problems
related to distinct pathways, potentially providing a link
also to the understanding of real reading impairments in
dyslexia.},
cin = {INM-1 / INM-3 / JARA-BRAIN},
ddc = {610},
cid = {I:(DE-Juel1)INM-1-20090406 / I:(DE-Juel1)INM-3-20090406 /
$I:(DE-82)080010_20140620$},
pnm = {333 - Pathophysiological Mechanisms of Neurological and
Psychiatric Diseases (POF2-333)},
pid = {G:(DE-HGF)POF2-333},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000335737500002},
pubmed = {pmid:23400699},
doi = {10.1007/s00429-013-0509-7},
url = {https://juser.fz-juelich.de/record/132059},
}