Significantly activated regions in the arithmetic task.

<p>Cortical activation maps are shown for the contrasts of Linear – Match (A), Quad – Simple, masked with Linear – Match (B), Simple – Match (C), and Linear – Simple (D). Activation is projected onto the left (L) and right lateral surfaces of a standard brain (family-wise error corrected <i>P</i><0.05), as well as onto the dorsal surface where there was significant activation. A transverse plane at <i>z</i> = 1 shows activation in the left anterior short insular gyrus. See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0111439#pone-0111439-t003" target="_blank">Tables 3</a> for the stereotactic coordinates.