(a) Schematic illustration of memristors used as synapses connecting pre-neuron and post-neuron and (b) the change of current in repeated voltage sweeps.^[8] Copyright (2010) American Chemical Society. Schematic drawings of resistive switching modes with (c) formation and rupture of a filament^[10] and (d) modification of the Schottky barrier height^[12] through voltage driving ion migration. Copyright (2009) American Chemical Society and Copyright (2009) John Wiley & Sons, Inc. (e) Mapping of a neural network on the one transistor and one memristor array.^[13] Copyright (2017) Springer Nature.