The simulation of the emotion illness. (a) The EPSC of the device to 10-times 430 nm light spikes at various VDS (-0.1, -1 and -3 V). (b) The change of the device EPSC under light spikes at various VDS (-0.1, -1 and -3 V). (c) The schematic effect of the depression on the synaptic response to the external stimulus.