On the validity of electric brain signal predictions based on population firing rates
Fig 3
Illustration of kernel method with toy model.
A: Two toy single-cell kernels (blue and orange), and the mean, that is, the population kernel (black). B: Raster plot of the two corresponding spike trains, with the same color code as in panel A. Each colored marker corresponds to a spike, and the individual spike trains are plotted at different heights along the y-axis. C: The population rate (average number of spikes per time bin, Δt = 0 . 1ms), that is, the mean firing rate from the spike trains in panel B. D: The gray line shows the ground truth toy LFP signal calculated as the sum of each single-cell contribution, which is again calculated by convolving the single-cell kernels with the corresponding spike trains. The black line shows the LFP calculated by convolving the population kernel with the population rate. The red line shows the difference between the ground truth LFP and the population kernel LFP.