20 February 2012
Different patterns of language activation in post-stroke aphasia are detected by overt and covert versions of the verb generation fMRI taskJane B. AllendorferBCDEF, Brett M. KisselaAD, Scott K. HollandADE, Jerzy P. SzaflarskiABCDEFG
Med Sci Monit 2012; 18(3): CR135-147
Background: Post-stroke language functions depend on the relative contributions of the dominant and non-dominant hemispheres. Thus, we aimed to identify the neural correlates of overt and covert verb generation in adult post-stroke aphasia.
Material and Methods: Sixteen aphasic LMCA stroke patients (SPs) and 32 healthy controls (HCs) underwent language testing followed by fMRI while performing an overt event-related verb generation task (ER-VGT) isolating activations related to noun-verb semantic processing or to articulation and auditory processing, and a covert block design verb generation task (BD-VGT).
Results: BD-VGT activation patterns were consistent with previous studies, while ER-VGT showed different patterns in SPs relative to HCs including less left-hemispheric involvement during semantic processing and predominantly right-sided activation related to articulation and auditory processing. ER-VGT intra-scanner performance was positively associated with activation during semantic associations in the left middle temporal gyrus for HCs (p=0.031) and left middle frontal gyrus for SPs (p=0.042). Increased activation in superior frontal/cingulate gyri was associated with better intra-scanner performance (p=0.020). Lesion size negatively impacted verbal fluency tested with Controlled Oral Word Association Test (p=0.0092) and the Semantic Fluency Test (p=0.033) and trended towards a negative association with verb generation performance on the event-related verb generation task (p=0.081).
Conclusion: Greater retention of pre-stroke language skills is associated with greater involvement of the left hemisphere with different cortical recruitment patterns observed in SPs versus HCs. Post-stroke verbal fluency may depend more upon the structural and functional integrity of the dominant left hemisphere language network rather than the shift to contralateral homologues.
Keywords: Magnetic Resonance Imaging - methods, Language, Aphasia - physiopathology, Stroke - complications
25 October 2021 : EditorialEditorial: The 2021 European Society of Cardiology (ESC) Guidelines on the Real-World Prevention of Atherosclerotic Cardiovascular Disease (ASCVD)
Med Sci Monit 2021; 27:e935172
22 October 2021 : Clinical ResearchA Novel Method for the Production of an Autologous Anti-Inflammatory and Anti-Catabolic Product (Cytorich) ...
Med Sci Monit In Press; DOI: 10.12659/MSM.934365
11 October 2021 : Clinical ResearchClinical Features and Temporal Lung Radiographic Changes in 25 Patients Recovering from COVID-19 Pneumonia:...
Med Sci Monit In Press; DOI: 10.12659/MSM.933381
08 September 2021 : Clinical ResearchAcceptance of COVID-19 Vaccination and Its Associated Factors Among Cancer Patients Attending the Oncology ...
Med Sci Monit In Press; DOI: 10.12659/MSM.932788
27 Oct 2021 : Clinical ResearchUse of the Braden Scale to Predict Injury Severity in Mass Burn Casualties
Med Sci Monit In Press; DOI: 10.12659/MSM.934039
27 Oct 2021 : Database AnalysisLow Expression of Long Noncoding RNA SLC26A4 Antisense RNA 1 Is an Independent Prognostic Biomarker and Cor...
Med Sci Monit In Press; DOI: 10.12659/MSM.934522
27 Oct 2021 : Database AnalysisA Novel Predictive Model Incorporating Ferroptosis-Related Gene Signatures for Overall Survival in Patients...
Med Sci Monit In Press; DOI: 10.12659/MSM.934050
Most Viewed Current Articles
20 Mar 2020 : Clinical ResearchSocial Capital and Sleep Quality in Individuals Who Self-Isolated for 14 Days During the Coronavirus Diseas...
Med Sci Monit 2020; 26:e923921
15 Apr 2020 : Clinical ResearchPsychological Impact and Coping Strategies of Frontline Medical Staff in Hunan Between January and March 20...
Med Sci Monit 2020; 26:e924171
05 May 2020 : Review articleAn Evidence Based Perspective on mRNA-SARS-CoV-2 Vaccine Development
Med Sci Monit 2020; 26:e924700