Fig. 4

Representative illustrations of the spiking activities of a preferential pyramidal cell. This cell exhibited a preferential firing in response to the low-pitch vs. right-arm association (upper), but had no preference for the going-right performance in the arbitrary spatial choice task (middle), nor for the low-pitch tone in the audio-reward control task (lower). Raster displays show spiking activities in individual trials. Histograms show average spiking activities, smoothed with Gaussian filter. Bin width is 100 ms. The frames in the histograms represent the tone presentation in the audio-place associative task and the audio-reward control task, or the ‘silence’ period in the arbitrary spatial choice task