Concordance for handedness and language dominance in male and female twin pairs.

<p>Twin pairs who were excluded from the analysis due to the intractability of the arcuate fasciculus are shown in brackets.</p

Cerebral language dominance.

<p>Asymmetry indices (AI) for the FA values of the arcuate fasciculus according to cerebral language dominance are shown. Twin pairs with discordant language dominance showed reversed AI_FA asymmetry.</p

Brain activity and the arcuate fasciculus.

<p>Averaged brain activity during word generation task (<b>A</b>) and reconstruction of the arcuate fasciculus on the <b>B</b>) 1% threshold and <b>C</b>) 2% threshold, respectively. Colour bars represent the number of subjects showing arcuate fasciculus fibers in that voxel.</p