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. 2012 Sep 6;6:63. doi: 10.3389/fncir.2012.00063

Figure 4.

Figure 4

Raster plots of cell activity and statistical properties of neuron clusters. Data were obtained from the same experiments and time segments as shown in Figure 3, but using all 98 units. Left panels: four-bursts raster plots for 12 neurons (duration, 1 s). Upper left: spike bursts recorded from electrodes devoid of GFP+ cells (the 2nd and 3rd row from top correspond to units 62b and 62a, whose waveforms are shown in Figure 3. Middle-left: spike bursts of the AEN-like type (see the main text). Lower-left: spike bursts of the AEN-unlike type. The left columns labeled FF in the middle and lower panels give the average FF values of each units. (A–C) ACF, FSH, and SNTH plots, respectively, obtained by using the software clusterization of the 78 and 20 units classified using FF (time window of 6 s). Half-closed squares: AEN-like units; open squares: AEN-unlike units. (D) Bar plots of BD, SN, FF, CV2, and τ1/2 values computed for the AEN-like (78 units; white bars) and AEN-unlike (20 units; black bars) clusters. Vertical scale bars: BD, 50 ms; SN, FF, and CV2, 2; τ1/2, 20 ms. (E–H) Percentage cumulative histograms of BD, SN, FF-CV2, and τ1/2, as indicated, for all units (lines), for excitatory (half-closed squares) and inhibitory (open squares) neurons, after FF-based clusterization. The bin width in cumulative histogram were, respectively: 0.025 s, 1, 0.5, 0.5, and 10 ms. For each variable, 3 independent data points were computed every 30 min. Total number of excitatory and inhibitory cells was 234 and 60, respectively.