Figure 6.

SSSs related to retention of the stimulus are associated with firing rate modulations. Comparison of SSSs and rate modulations between high tone and low tone trials was selected in this example. Each subfigure averages all correct trials of a session. Results of U-tests of 5 s of tone presentation in the preceding trial, 5 s of delay, and 2 s of tone presentation in the next trial are shown. (A) Firing rates of neuron 3 in high tone (red) and low tone (blue) trials. (B,C) Raster plots of spikes of neuron 3 in high tone (red) and low tone (blue) trials. (D) The P-values of neuron 3 for the difference between rates in high tone and low tone trials. (E) Firing rates of neuron 5. (F,G) Raster plots of neuron 5. (H) The P-values of neuron 5. (I) Rates of the SSS between neurons 3 and 5. (J–M) In copies of raster plots from (B), (C), (F), and (G) (black dots), SSSs are shown as green dots. (N) P-value of the SSS between neurons 3 and 5. The significant firing rates of neurons 3 and 5 are associated with SSS. Additional details are presented in Figure 5 and described in Section ‘Materials and Methods’.