Table 3.

Subgroup analyses of included studies.

Subgroups	Left rolandic operculum, BA 48	Right precentral gyrus, BA 6	New findings
Studies using SPM (n = 18)	No	Yes	Left inferior frontal gyrus
Studies using FWHM of 6–8 mm (n = 15)	No	Yes	Left superior temporal gyrus
Studies using GM volume (n = 23)	Yes	Yes	Left superior temporal gyrus
Studies correcting for multiple comparisons(n = 20)	Yes	Yes	Left inferior/superior frontal gyrus

BA, Brodmann; FWHM, full-width half maximum; GM, gray matter; SPM, statistical parametric mapping.