Signal Processing by Multiplexing and Demultiplexing in Neurons

Signal processing capabilities of biological neurons are investigated. Temporally coded signals in neurons can be multiplexed to increase the transmission capacity. Multiplexing of signal is suggested in bi-threshold neurons with II high-threshold II and II low-thre shold II for switching firing modes. To extract the signal embedded in the interspikeintervals of firing, the encoded signal are de multiplexed and multiplexed by a network of neurons with delayed-line circuitry for signal processing. The temporally coded input signal is transformed spatially by mapping the firing intervals topographically to the output of the network, thus decoding the specific firing inters pike-intervals. The network also provides a band-pass filtering capability where the variability of the timing of the original signal can be decoded.