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Efficient localization of the cortical language network and its functional neuroanatomy in dyslexia
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Abstract:
The functional neuroanatomy of language localization in dyslexia has primarily been studied in the context of reading. However, dyslexia is sometimes referred to as a “language-based learning disability,” yet the functional signature of the core language comprehension network in dyslexia is far less understood. This thesis presents a series of studies designed to compare the functionality of the brain regions supporting linguistic processing between typical and impaired readers in order to characterize the cortical language network in dyslexia. First, we investigate the extent to which the efficiency (or quality of data vs. amount of scan time) of a functional language localizer based on passive spoken language comprehension can be maximized in Chapter 2. By demarcating the language network based on smaller amounts of data and testing stability and reliability within this framework, we found that scan time can be substantially reduced without sacrificing functional specialization for language. In Chapter 3, we apply the spoken language localizer to determine differences in functional organization of language in dyslexia and provide evidence that the core spoken language comprehension network is not markedly different between typical readers and those with dyslexia. We compared the individual activations from whole-brain analysis and functional profiles in the canonical language-selective regions and found that the functional response of localized language regions in individuals with dyslexia was as selective as in typically reading adults. Chapter 4 follows up on the functional evidence reported in Chapter 3 to examine the structural connectivity within the same functional language network and additionally found essentially no differences between controls and dyslexia, further supporting the observations made in Chapter 3 that core linguistic processing is intact in dyslexia. All together, these findings converge on the suggestion that individuals with dyslexia do not rely on a separate cognitive architecture for language, potentially revealing important new insight into the dissociation of language specialization abilities and reading difficulty in dyslexia.
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Keyword:
Cognition; DWI; fMRI; Language; Neuroimaging; Speech; Test-retest reliability
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URL: https://hdl.handle.net/2144/43724
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| 2 |
An Analysis of the Redesigned SAT-I Mathematics: Perceptions of Teachers, English Proficient Students, and English Language Learners
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| 3 |
Between PIAAC and the new literacy studies. What adult education can learn from large-scale assessments without adopting the neo-liberal paradigm ...
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Between PIAAC and the new literacy studies. What adult education can learn from large-scale assessments without adopting the neo-liberal paradigm
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In: Münster ; New York : Waxmann 2021, 265 S. - (Alphabetisierung und Grundbildung; 14) (2021)
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| 5 |
STUDENT ACHIEVEMENT INDICATORS AT DEFENSE LANGUAGE INSTITUTE FOREIGN LANGUAGE CENTER
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| 6 |
Student engagement with teacher written feedback on IELTS Writing Task 2 rehearsal essays
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Pearson, WS. - : University of Exeter, 2021. : Graduate School of Education, 2021
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Development of a new aphasia test for Vietnamese people (Vietnamese aphasia test)
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| 9 |
Age, Task Characteristics, and Acoustic Indicators of Engagement: Investigations into the Validity of a Technology-Enhanced Speaking Test for Young Language Learners
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| 10 |
Forschungsinstrumente im Kontext institutioneller (schrift-)sprachlicher Bildung
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In: Bad Heilbrunn : Verlag Julius Klinkhardt 2020, 159 S. (2020)
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| 11 |
"Langsam vermisse ich die Schule .". Schule während und nach der Corona-Pandemie
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In: Münster ; New York : Waxmann 2020, 229 S. - (Die Deutsche Schule, Beiheft; 16) (2020)
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| 12 |
Age, Task Characteristics, and Acoustic Indicators of Engagement: Investigations into the Validity of a Technology-Enhanced Speaking Test for Young Language Learners ...
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| 13 |
Shared Storybook Reading and the Development of Oral Language Skills ... : Das gemeinsame Lesen von Kinderbüchern und die Entwicklung frühkindlicher Sprachfähigkeiten ...
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| 14 |
Language aptitude influence on foreign language acquisition
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| 16 |
Living with IELTS: the stories of IELTS test candidates
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Yucel, Megan. - : The University of Queensland, School of Languages and Cultures, 2020
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| 17 |
Die Brücke zwischen Sprachstandsdiagnostik und Deutschförderung im UF Psychologie/Philosophie
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| 18 |
The test-retest reliability of the Western Aphasia Battery-Revised
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| 19 |
Assessing EFL speaking skills in Vietnamese tertiary education
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