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AuthorGroth, Katarinadc.contributor.author
Date of accession2016-03-15T09:07:21Zdc.date.accessioned
Available in OPARU since2016-03-15T09:07:21Zdc.date.available
Year of creation2012dc.date.created
AbstractPoor phonological processing is considered as the core symptom of developmental dyslexia (DD). Yet, it is still debated whether this deficit is the primary cause or whether it reflects a secondary symptom resulting from impairments in the processing of basic acoustic parameters of the speech signal, like rapid temporal processing. Aim of this work was to investigate temporal auditory processing in DD on a behavioural and neural level by means of a German vowel length discrimination task. Vowel pairs differing only by vowel length, being characterized by temporal and spectral cues, were chosen. Two types of long-short vowel pair differences were varied: In the phonological condition (PC), pairs of natural vowels were used, differing temporally and spectrally. In the temporal condition (TC), a natural vowel was combined with a manipulated one to keep spectral content of long and short vowels identical and thus, differing only temporally. Vowels were embedded into pseudowords and presented successively in a same-different task. 20 adolescents and adults with DD and 20 age matched controls participated in a behavioural and fMRI experiment. Discrimination accuracy differed in the TC only, with dyslexics performing significantly inferior compared to controls. Brain activation in the TC, but not in the PC, was observed bilaterally within the anterior insular cortices (AIC) in both groups and within the left inferior frontal gyrus (IFG) in controls. Group subtraction analyses were not significant. Subgroup analyses (based on TC performance) revealed decreased activation of the AIC and the left IFG in low performing dyslexics compared to high performing controls. The findings of this work support the notion that DD is associated with deficits in the processing of temporal auditory information and indicate that the left IFG and the AIC are part of a neural network involved in temporal auditory processing, which seems to be impaired in at least a subgroup of subjects with DD.dc.description.abstract
Languageendc.language.iso
PublisherUniversität Ulmdc.publisher
LicenseStandarddc.rights
Link to license texthttps://oparu.uni-ulm.de/xmlui/license_v3dc.rights.uri
KeywordTemporal auditory processingdc.subject
KeywordVowel length discriminationdc.subject
Dewey Decimal GroupDDC 610 / Medicine & healthdc.subject.ddc
MeSHDyslexiadc.subject.mesh
MeSHMagnetic resonance imagingdc.subject.mesh
TitleThe aspect of temporal auditory information for German vowel length processing in developmental dyslexia: Behavioural and fMRI Experimentsdc.title
Resource typeDissertationdc.type
DOIhttp://dx.doi.org/10.18725/OPARU-2856dc.identifier.doi
PPN750167025dc.identifier.ppn
URNhttp://nbn-resolving.de/urn:nbn:de:bsz:289-vts-84779dc.identifier.urn
FacultyMedizinische Fakultätuulm.affiliationGeneral
Date of activation2013-06-06T15:26:50Zuulm.freischaltungVTS
Peer reviewneinuulm.peerReview
Shelfmark print versionW: W-H 13.284uulm.shelfmark
DCMI TypeTextuulm.typeDCMI
VTS-ID8477uulm.vtsID
CategoryPublikationenuulm.category
University Bibliographyjauulm.unibibliographie


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