Blind source separation by spike-timing-dependent plasticity (STDP).

(A) Four original auditory signals (from the top to the fourth set of signals) and one mixed signal (bottom). (B) Amplitudes of original signals (black lines) and those estimated from output firing rates (colored lines). (C) Spectra of auditory sources a^q_h(f) (left). Raster plots of input neuron activity. Colors were probabilistically assigned based on expected sources. All figures were calculated from the 30’00”–30’10” portion of the auditory signals and simulation.