We also estimated the voxel's average activity between left and right hemispheres (i.e., (left + right hemisphere activity)/2) and used it as a covariate of non-interest in the analyses looking at the relationship between hemispheric dominance and other measures.
These differences have been attributed to ecological factors (storing vs. non-storing bird species: Clayton and Krebs 1994; Brodbeck 1994; Brodbeck and Shettleworth 1995), sex differences (shiny cowbirds: Astié et al. 1998; chicks: Vallortigara 1996), or hemispheric differences (i.e. the brain hemisphere in charge of solving a task) (chicks: Vallortigara 2000; Regolin et al. 2005).
while congenital prosopagnosics displayed less left than right hemispheric activity (i.e. the index is smaller than zero t(6) = −4.027; p = .007).007
As expected from the results above and shown in Figure 3, controls showed no hemispheric difference (i.e. the index did not differ from zero (t(6) = −.248; n.s).s
Lateralization of brain functions has been related to inter-hemispheric inhibition, i.e. an inhibitory influence of the hemisphere dominant in a task on the non-dominant hemisphere (Chiarello and Maxfield, 1996).
Furthermore, progesterone should only affect global advantage negatively in conditions involving inter-hemispheric inhibition, i.e. during the focused, but not during the divided attention condition.
Our findings show less deactivation during semantic compared to the two non-semantic tasks for the entire DMN unit and within left-hemispheric DMN regions, i.e., the dorsal medial prefrontal cortex, the anterior cingulate cortex, the retrosplenial cortex, the angular gyrus, the middle temporal gyrus and the anterior temporal region, as well as the right cerebellum.
The PC-1(D) curves in Fig. 7a also show expected northern hemispheric type of variations, i.e., easterly maximum in the forenoon and westerly minimum in afternoon hours.
The D-component in Fig. 2 on AQD do not show much difference with normal quiet day (NQD) and show expected northern hemispheric type of variations i.e., easterly maximum in the forenoon and westerly minimum in early afternoon hours.
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