Figure 7: Channel identification for . (a) Input signals are bandlimited to 50 Hz. The order of the space . (b) Biased output of the filter in response to the stimulus . (c) The filter output in (b) is integrated by an ideal IAF neuron. (d) The neuron generated a total of 28 spikes in response to 2 input signals. (e) The identified filter (red) is exactly the kernel for with rad/s and . Also shown is the original filter (dashed black) and its projection (blue). The MSE between and is −87.6 dB. (f)–(h) Fourier amplitude spectra of , and . As before, but .