Fig. 9.

Quantitative analysis of the distribution of labeled cells following tracer injections in area 4δc. A, B) Number of labeled cells in different regions of the frontal cortex plotted on flattened representations of the cortex in 2 cats, Prem10 (A, same cat as in Fig. 8) and Prem9. Each circle represents a 200 μm bin and the color of that circle indicates the relative proportion of cells labeled in the bin (see color key). For example, a red symbol indicates all bins containing between 80% and 100% of the maximum value (mean + SD; see Methods). C, D) Contour plots in which the maximum contour is again set to the mean + SD and the dataset is divided into 20 levels. E) Contour plot of the distribution of cat Prem7, with an injection in area 4δc. F) Contour plot of the cells that were labeled following an injection into area 6iffu, also in cat Prem7 (taken from Nakajima et al. 2019). Filled black areas and surrounding white region in all parts of the figure indicate the location of the injection site and the surrounding exclusion site (same convention in Fig. 10). In the larger of the 2 boxes in each part of the figure, cells are aligned with respect to the fundus of the cruciate sulcus with negative values indicating cells rostral to the fundus of the cruciate sulcus and positive values cells that are caudal to the fundus. In the smaller box, cells are aligned on the fundus of the splenial sulcus with cells in the cingulate cortex that are caudal and ventral (CV) to the fundus being indicated by negative values and cells that are caudal and dorsal (CD) being indicated by positive values.