-0.9 0 50 100 150 200 250 300 350 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 -0.8 -0.6 -0.4 -0.2 120 100 80 60 40 20 0 120 100 80 60 40 20 0 120 100 80 60 40 20 0 Peak (mV) 0 200 400 600 800 1000 -0.8 -0.6 -0.4 -0.2 Peak (mV) 0 40 80 120 160 Spike number Spike class (mV) -0.8 -0.6 -0.4 -0.2 Peak (mV) Spike count Spike count Spike count Baseline activity Telson stimulated Swimmeret stimulated

Figure 2.4i Activity Histograms. Raw AP amplitudes (10 s duration) and histograms of spike count vs. size class. These are negative peaks; a more negative amplitude indicates a larger spike. A. Without stimulation, four or five size classes appear in the histogram. B. After telson stimulation, activity is increased, with some large APs that were not present before. Five or six size classes appear in the histogram. C. After swimmeret stimulation, activity is reduced (more in some spike classes than others).

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