The physiological properties of human and rodent neurons differ, yet the extent to which these differences reflect human specializations is often unclear. Compared with their rodent counterparts, human supragranular pyramidal neurons possess enriched Hyperpolarization-activated Cyclic Nucleotide-gated channel (HCN channel)-dependent intrinsic membrane properties and a related sensitivity to synaptic inputs containing delta/theta band frequencies. Here we test whether other primate species posses...