The dorsal region of the anterior cingulate gyrus is associated with rational thought processes, most notably active during the Stroop task.
Guenon
In the guenon, Brodmann area 32 is a subdivision of the cytoarchitecturally defined cingulate region of cerebral cortex. This area was named 25 in Brodmann-1905 and labeled 25 in a figure contributed by Brodmann in Mauss-1908. In Brodmann-1909, however, the area was labeled 32 and the name "area 25" was attached to the area that has since been the accepted area 25 of Brodmann-1909 (Vogt-87). Distinguishing features according to Brodmann-1905: in contrast with area 6 of Brodmann-1909 the cortex of area 32 is relatively thick; the transition from cortex to white matter is more gradual; the distribution of cells is less dense; and there is no distinct boundary between the inner pyramidal layer (V) and the multiform layer (VI); it is similar to area 6 in the general absence of distinct layers, particularly of an internal granular layer (IV), but differs in that cells are smaller and there is an increased density of medium-sized pyramidal cells at the level of layer IV; this population of cells makes area 32 similar to the neighboring area 24 of Brodmann-1909; it differs from area 24 by its greater overall thickness and a particularly thick layer VI that merges gradually with the subcortical white matter. Brodmann-1909 regarded area 32 as topologically, but not cytoarchitecturally, homologous to the human dorsal anterior cingulate area 32; area 25 of Walker-1940 is topologically homologous to area 32.
