Fig. 2.

Preliminary sulcal labelling on the lateral surface of the cortical hemisphere of the prosimian and monkey species in this study. All surfaces were reconstructed from the scanned sample except for the macaque, for which we used the F99 template brain (Van Essen et al. 2012). Left hemisphere lateral sulcus on the left, medial surface on the right. AS arcuate sulcus, CaS calcarine sulcus, CeS central sulcus, CgS cingulate sulcus, LOCS lateral occipital sulcus, IPS intra-parietal sulcus, LaS lateral sulcus, LuS lunate sulcus, POS parietal–occipital sulcus, PS principal sulcus, pSFD posterior superior frontal dimple, STS superior temporal sulcus. Note that brains are not displayed to scale