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Review

Voxel-based morphometry: current perspectives

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Pages 19-35 | Published online: 14 Jul 2016

Figures & data

Table 1 Single-case VBM studies

Figure 1 Distribution of false positives in parametric and nonparametric single-case VBM.

Notes: In the top panel, the figure represents the percentage of false positives found in each brain regions when using parametric statistics with P=0.05 FWE correction: colors reflected the percentage of false positives (adapted from Neuroimage, 70, Scarpazza C, Sartori G, De Simone M, Mechelli A, When the single matters more than the group: very high false positive rates in single case voxel based morphometry, 175–188,Citation91 Copyright ©2013, with permission from Elsevier.). In the bottom panel, the figure represents the localization of false positives based on peak coordinates with P=0.05 FWE correction (adapted from Scarpazza C, Nichols T, Seramondi D, Maumet C, Sartori G, MechelliA. When the single matters more than the group (II): addressing the problem of high false positive rates in single case voxel based morphometry using non-parametric statistics. Front Neurosci. 2016;10:6.Citation92): colors reflected the different brain regions in which the false positives were found to be located. In both panels, (A) GM increases in the single subject compared with the control group at P<0.05 corrected and (B) GM decreases in the single subject compared with the control group at P<0.05 corrected.
Abbreviations: VBM, voxel-based morphometry; FWE, family-wise error; GM, gray matter.
Figure 1 Distribution of false positives in parametric and nonparametric single-case VBM.

Figure 2 Example of single-case VBM.

Notes: The figure represents (A) the localization of false positives when investigating the decrease of GM in a single subject compared with a control group (in which the light blue means the absence of false positives, the blue a false-positive rate from 0.5% to 5%, and the green a false-positive rate from 5.5% to 10%) and (B) the localization of significant findings in a murderer compared with a control group (Rigoni et alCitation107). (A) Adapted from Neuroimage, 70, Scarpazza C, Sartori G, De Simone M, Mechelli A, When the single matters more than the group: very high false positive rates in single case voxel based morphometry, 175–188,Citation91 Copyright ©2013, with permission from Elsevier.
Abbreviations: VBM, voxel-based morphometry; GM, gray matter.
Figure 2 Example of single-case VBM.

Figure 3 The risk of reverse inference.

Notes: (A) Author’s brain compared with 16 controls (Reprinted from Neuroimage, 70, Scarpazza C, Sartori G, De Simone M, Mechelli A, When the single matters more than the group: very high false positive rates in single case voxel based morphometry, 175–188,Citation91 Copyright ©2013, with permission from Elsevier). The significant cluster denotes increased GM in the single brain compared to controls located in the dorsolateral prefrontal cortex. According to Scarpazza et al,Citation91 this cluster has up to 10% of likelihood to be a false positive. (B) Smaller GM volume in binge drinkers compared with healthy controls, adapted from Doallo S, Cadaveira F, Corral M, Mota N, López-Caneda E, Holguín S. Larger mid-dorsolateral prefrontal gray matter volume in young binge drinkers revealed by voxel-based morphometry. PLoS One. 2014;9(5):e96380.Citation112 The significant cluster is located in the dorsolateral prefrontal cortex.
Abbreviation: GM, gray matter.
Figure 3 The risk of reverse inference.