TY - JOUR
T1 - Relative utility for hemispheric lateralization of different clinical fMRI activation tasks within a comprehensive language paradigm battery in brain tumor patients as assessed by both threshold-dependent and threshold-independent analysis methods
AU - Pillai, Jay J.
AU - Zaca, Domenico
N1 - Funding Information:
The work is partially and indirectly funded by a Siemens grant, but overall, there is no conflict of interest.
PY - 2011/1
Y1 - 2011/1
N2 - The aim of this study was to compare the relative effectiveness of 6 different commonly used language fMRI activation paradigms, including receptive and expressive, as well as semantic and phonological tasks, for hemispheric lateralization in brain tumor patients utilizing both threshold-dependent and threshold-independent approaches. We studied 46 right-handed patients with primary intra-axial brain tumors with BOLD fMRI on a 3-T MRI system. A linear fit of the laterality indices (LIs) as a function of the t-value (which varied from 2.0 to 6.5) was calculated and the slope (M) taken as measure of LI variability in the threshold-dependent LI approach; for the threshold-independent approach, the LIs were determined by comparing the integrated T-score weighted distributions of all positively task-correlated voxels of the left and the right hemispheric regions of interest. We demonstrated that silent word generation (SWG) and rhyming (R) were the two expressive tasks that provided the best hemispheric language lateralization in this group, based on concordant threshold-dependent and threshold-independent analyses. Furthermore, R (mean LI value = 61.91, M= 7.9 ± 1.5) had a higher mean LI value and was less threshold-dependent than SWG (mean LI = 52.97, M= 11.40 ± 0.64) for LI determination. SWG and R were able to provide effective language lateralization even in the subgroup of patients with lesions located in the left hemisphere and in the frontal or parietal lobes. The receptive language paradigms examined in this study (passive listening [PL], listening comprehension [LC], and reading comprehension [RC]) were less effective than SWG and R for language lateralization.
AB - The aim of this study was to compare the relative effectiveness of 6 different commonly used language fMRI activation paradigms, including receptive and expressive, as well as semantic and phonological tasks, for hemispheric lateralization in brain tumor patients utilizing both threshold-dependent and threshold-independent approaches. We studied 46 right-handed patients with primary intra-axial brain tumors with BOLD fMRI on a 3-T MRI system. A linear fit of the laterality indices (LIs) as a function of the t-value (which varied from 2.0 to 6.5) was calculated and the slope (M) taken as measure of LI variability in the threshold-dependent LI approach; for the threshold-independent approach, the LIs were determined by comparing the integrated T-score weighted distributions of all positively task-correlated voxels of the left and the right hemispheric regions of interest. We demonstrated that silent word generation (SWG) and rhyming (R) were the two expressive tasks that provided the best hemispheric language lateralization in this group, based on concordant threshold-dependent and threshold-independent analyses. Furthermore, R (mean LI value = 61.91, M= 7.9 ± 1.5) had a higher mean LI value and was less threshold-dependent than SWG (mean LI = 52.97, M= 11.40 ± 0.64) for LI determination. SWG and R were able to provide effective language lateralization even in the subgroup of patients with lesions located in the left hemisphere and in the frontal or parietal lobes. The receptive language paradigms examined in this study (passive listening [PL], listening comprehension [LC], and reading comprehension [RC]) were less effective than SWG and R for language lateralization.
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U2 - 10.1016/j.neuroimage.2010.03.082
DO - 10.1016/j.neuroimage.2010.03.082
M3 - Article
C2 - 20380883
AN - SCOPUS:78650844628
SN - 1053-8119
VL - 54
SP - S136-S145
JO - NeuroImage
JF - NeuroImage
IS - SUPPL. 1
ER -