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Pulse forms used for the simulations: For the coding of the grayscale input images, positive and negative voltage pulses (Vpre) with ±0.6 V in amplitude and 6 ms in width have been used. The voltage pulses of the output neurons (Vpost) were set to a combination of a +2.9 V and a –2.3 V voltage pulses with a total duration of 6 ms. The combination of both voltage pulses (i.e., Vpre and Vpost) leads either to a potentiation (Vpot) or depression (Vdep) of the memristive device.
