Fig. 1

a – peristimulus histograms for the sum of spikes based on the analysis of spike activity of hippocampal neurons (presented as a raster) with TD-PTP type of responses, recorded in response to HFS of entorhinal cortex, b – diagrams of average spike frequency present mean values of frequency (spike/sec) of neuronal spike flow in real time 20 s before HFS (Mbe), 20 s after HFS (Mpe) and 1 s during HFS (Mtt); n - number of neurons used to calculate the averaged frequency of spiking activity for the diagram