Figure 7
Summary of the recording performance comparison of edge and center sites. (a) Ratio of the probability density values of edge sites to center sites calculated in the negative amplitude range from 0 μV to − 1000 μV, for each probe type. The larger first dot represents the sum of the probability values computed in the range below − 350 μV. The dashed line indicates the position where the probability of edge samples and center samples is equal. The thick line with light blue color shows the average of the five probes. (b) Values illustrated in (a) averaged over the whole negative amplitude range for each probe type (mean ± standard deviation). Probes are ordered by shank width. (c) Distributions of the spike amplitudes of all single units recorded on edge (green, n = 2351 units) and center (red, n = 2102 units) sites. Note that the direction of the x-axis is reversed. (d) Reverse cumulative distributions of spike amplitudes calculated from (c). Green shaded areas indicate amplitudes with significantly higher numbers of edge units. In (c) and (d), amplitudes start at 60 µV.
