Figure 10.

The prevalence of functional interactions (darker shades of blue or green in pie chart) between parietal and frontal areas increases among euarchontoglires as we sample species that are more specialized for manual dexterity (e.g. macaques). Specialized adaptations for manual dexterity are most evident in the primate lineage, followed by colugos and tree shrews, their closest living relatives, and then the more distantly related rodents (rats) and lagomorphs. Results of tests in APC and PPC are shown as pie charts. Blue represents homotopic tests, whereas green represents heterotopic. Darker colors represent reduced amplitude or abolished movement while lighter shades represent attempted tests in which movement was unaffected. Functional data for tree shrews from Ref. 61. Functional data for galagos from Ref. 5. Functional data for macaques from the current study. Note that APC data for tree shrews were recorded predominantly from area 3 b, whereas data for other species were predominantly taken from areas 1 and 2.