PPF was changed in the ACC after sexual attraction. (A) Sample traces show the three types of pyramidal neurons in layer II/III of ACC. IM, intermediate neurons; RS, regular spiking neurons; IB, intrinsic bursting neurons. (B) PPF of IM neurons (upper) was decreased after sexual attraction in the pathway of Layer V-Layer II/III, while no change has been detected on other two kinds of pyramidal neurons. (C) No interaction between two pathways induced by layer V and layer I stimulations. Time interval between two stimulations was 55 ms. (D) PPF induced by S1 (layer I stimulation) did not change after sexual attraction.