Fig. 3

Identification of pyramidal cells versus interneurons and database of preferential cells. a Inter-spike interval histogram and average spike waveform of a pyramidal cell. b Inter-spike interval histogram and average spike waveform of an interneuron. Pyramidal cells typically fired slowly with wider spike waveform and exhibited longer inter-spike intervals, whereas interneurons typically fired fast with narrow spike waveform and demonstrated shorter inter-spike intervals. Bin width is 1.0 ms. Insert: a brain section illustrating the placement of electrode array in the mPFC. c Plotting of responses to audio-place associations by preferential cells. The abscissa is the firing response to the high-pitch tone presentation, and the ordinate is that to the low-pitch tone presentation. The cells distributing above the diagonal preferred for the high-pitch vs. left-arm association, and the cells distributing below the diagonal preferred for the low-pitch vs. right-arm association. d The enlargement of the squared area in Figure C. Filled circles: pyramidal cells; Open circle: interneurons