Aphasia Neuroplasticity Review

Fridriksson et al. (2009)

Reference

AuthorsFridriksson J, Baker JM, Moser D
TitleCortical mapping of naming errors in aphasia
ReferenceHum Brain Mapp 2009; 30: 2487-2498
PMID19294641
DOI10.1002/hbm.20683

Participants

LanguageUS English
Inclusion criteria
Number of individuals with aphasia11
Number of control participants10
Were any of the participants included in any previous studies?No
Is age reported for patients and controls, and matched?Yes (mean 58.8 ± 14.7 years, range 33-78 years)
Is sex reported for patients and controls, and matched?Yes (males: 6; females: 5)
Is handedness reported for patients and controls, and matched?No
Is time post stroke onset reported and appropriate to the study design?Yes (range 10-101 months)
To what extent is the nature of aphasia characterized?Comprehensive battery
Language evaluationWAB; BNT
Aphasia severityAQ range 31.8-91.5
Aphasia type6 anomic, 4 Broca's, 1 transcortical motor; alternatively: 6 fluent, 5 non-fluent
First stroke only?Not stated
Stroke typeNot stated
To what extent is the lesion distribution characterized?Lesion overlay
Lesion extentRange 3.0-342.2 cc
Lesion locationL MCA
Participants notes

Imaging

ModalityfMRI
Is the study cross-sectional or longitudinal?Cross-sectional
If longitudinal, at what time point(s) were imaging data acquired?
If longitudinal, was there any intervention between the time points?
Is the scanner described?No (not stated)
Is the timing of stimulus presentation and image acquisition clearly described and appropriate?No (timing of picture presentation not clearly explained)
Design typeEvent-related
Total images acquired120
Are the imaging acquisition parameters, including coverage, adequately described and appropriate?Yes (whole brain)
Is preprocessing and intrasubject coregistration adequately described and appropriate?Yes
Is first level model fitting adequately described and appropriate?Yes
Is intersubject normalization adequately described and appropriate?Yes
Imaging notessparse sampling

Conditions

Are the conditions clearly described?Yes
ConditionResponse typeRepetitionsAll groups could do?All individuals could do?
picture namingWord (overt)80YesNo
viewing scrambled imagesNone40N/AN/A
Conditions notes

Contrasts

Are the contrasts clearly described?Yes

Contrast 1: picture naming (correct trials) vs viewing scrambled images

Language conditionPicture naming (correct trials)
Control conditionViewing scrambled images
Are the conditions matched for visual demands?Yes
Are the conditions matched for auditory demands?No
Are the conditions matched for motor demands?No
Are the conditions matched for cognitive/executive demands?No
Is accuracy matched between the language and control tasks for all relevant groups?N/A, tasks not comparable
Is reaction time matched between the language and control tasks for all relevant groups?N/A, tasks not comparable
Behavioral data notes
Are control data reported in this paper or another that is referenced?Somewhat
Does the contrast selectively activate plausible relevant language regions in the control group?No
Are activations lateralized in the control data?Somewhat
Control activation notesControl data in Fridriksson et al. (2007); motor activations are prominent; there is some L frontal activation but little temporal activation in either hemisphere
Contrast notes

Contrast 2: picture naming (phonemic paraphasias) vs picture naming (correct trials)

Language conditionPicture naming (phonemic paraphasias)
Control conditionPicture naming (correct trials)
Are the conditions matched for visual demands?Yes
Are the conditions matched for auditory demands?Yes
Are the conditions matched for motor demands?Yes
Are the conditions matched for cognitive/executive demands?Yes
Is accuracy matched between the language and control tasks for all relevant groups?No, by design
Is reaction time matched between the language and control tasks for all relevant groups?Unknown, not reported
Behavioral data notes
Are control data reported in this paper or another that is referenced?N/A
Does the contrast selectively activate plausible relevant language regions in the control group?N/A
Are activations lateralized in the control data?N/A
Control activation notesControl data N/A because controls do not typically make errors
Contrast notes

Contrast 3: picture naming (semantic paraphasias) vs picture naming (correct trials)

Language conditionPicture naming (semantic paraphasias)
Control conditionPicture naming (correct trials)
Are the conditions matched for visual demands?Yes
Are the conditions matched for auditory demands?Yes
Are the conditions matched for motor demands?Yes
Are the conditions matched for cognitive/executive demands?Yes
Is accuracy matched between the language and control tasks for all relevant groups?No, by design
Is reaction time matched between the language and control tasks for all relevant groups?Unknown, not reported
Behavioral data notes
Are control data reported in this paper or another that is referenced?N/A
Does the contrast selectively activate plausible relevant language regions in the control group?N/A
Are activations lateralized in the control data?N/A
Control activation notesControl data N/A because controls do not typically make errors
Contrast notes

Analyses

Are the analyses clearly described?Yes

Voxelwise analysis 1

First level contrastPicture naming (correct trials) vs viewing scrambled images
Analysis classCross-sectional aphasia vs control
Group(s)Aphasia vs control
Covariate
Is the second level contrast valid in terms of the group(s), time point(s), and measures involved?Yes
Is accuracy matched across the second level contrast?Yes, correct trials only
Is reaction time matched across the second level contrast?Unknown, not reported
Behavioral data notes
Type of analysisVoxelwise
Search volumeVoxels spared in all patients
Correction for multiple comparisonsClusterwise correction with with GRFT and lenient voxelwise p
SoftwareFSL (FEAT 5.4)
Voxelwise p~.01 (z > 2.3)
Cluster extentBased on GRFT
Statistical details
FindingsNone
Findings notes

Voxelwise analysis 2

First level contrastPicture naming (phonemic paraphasias) vs picture naming (correct trials)
Analysis classCross-sectional performance-defined conditions
Group(s)Aphasia
Covariate
Is the second level contrast valid in terms of the group(s), time point(s), and measures involved?Yes
Is accuracy matched across the second level contrast?No, by design
Is reaction time matched across the second level contrast?Unknown, not reported
Behavioral data notes
Type of analysisVoxelwise
Search volumeVoxels spared in all patients
Correction for multiple comparisonsClusterwise correction with with GRFT and lenient voxelwise p
SoftwareFSL (FEAT 5.4)
Voxelwise p~.01 (z > 2.3)
Cluster extentBased on GRFT
Statistical details
Findings↑ L superior parietal
↑ L posterior inferior temporal gyrus/fusiform gyrus
↑ L occipital
Findings notes

Voxelwise analysis 3

First level contrastPicture naming (semantic paraphasias) vs picture naming (correct trials)
Analysis classCross-sectional performance-defined conditions
Group(s)Aphasia
Covariate
Is the second level contrast valid in terms of the group(s), time point(s), and measures involved?Yes
Is accuracy matched across the second level contrast?No, by design
Is reaction time matched across the second level contrast?Unknown, not reported
Behavioral data notes
Type of analysisVoxelwise
Search volumeVoxels spared in all patients
Correction for multiple comparisonsClusterwise correction with with GRFT and lenient voxelwise p
SoftwareFSL (FEAT 5.4)
Voxelwise p~.01 (z > 2.3)
Cluster extentBased on GRFT
Statistical details
Findings↑ R posterior inferior temporal gyrus/fusiform gyrus
↑ R occipital
Findings notes

ROI analysis 1

First level contrastPicture naming (correct trials) vs viewing scrambled images
Analysis classCross-sectional correlation with language or other measure
Group(s)Aphasia
CovariatePicture naming accuracy
Is the second level contrast valid in terms of the group(s), time point(s), and measures involved?Yes
Is accuracy matched across the second level contrast?Yes, correct trials only
Is reaction time matched across the second level contrast?Unknown, not reported
Behavioral data notes
Type of analysisRegions of interest (ROI)
ROI typeFunctional
How many ROIs are there?5
What are the ROI(s)?(1) R IFG/insula; (2) R motor/premotor; (3) R SMA; (4) R inferior parietal; (5) R superior temporal
How are the ROI(s) defined?Regions activated for picture naming vs viewing scrambled images in aphasia
Correction for multiple comparisonsNo correction
Statistical details
Findings↑ R IFG
↑ R insula
Findings notesR IFG showed more activation in patients who produced more correct responses

Notes

Excluded analyses