Fig. 2.

Activation of Left and Right-Starters in precentral gyrus (BA 6). (A) Illustration of haemodynamic activation in premotor cortex rendered on a standard brain surface. Red color referring to activation of right-starters, blue color presenting activation of left-starters. Contrast “numbers (1–5) > baseline”; threshold: p(unc) < .01. Solid-lined circles indicate main regions of activation for the respective counting groups [30, − 26, 62; − 22, − 14, 50], dotted-lined circles the mirror images of these regions [22, − 14, 50; − 30, − 26, 62]. (B) The graph illustrates mean parameter estimates (in arbitrary units) for cluster differentially activated by subgroups of right-starters (red) and left-starters (blue) in premotor cortex. Contrast “numbers (1–5) > baseline”; the significant counting group-by-region interaction is shown by brackets. (C) The graph illustrates mean parameter estimates (in arbitrary units) for cluster differentially activated by subgroups of right-starters (red) and left-starters (blue) in premotor cortex, with mirror images of extracted regions. Contrast “numbers (1–5) > baseline”; the marginal significant counting group-by-region interaction is shown by brackets. (D) Illustration of haemodynamic activation of finger-localizer, rendered on a standard brain surface. Red color referring to activation of right-starters, blue color presenting activation of left-starters. Contrast “all fingers > baseline”; threshold: p(FWE) < .05.