Fig. 6From: The Characteristics of Binary Spike-Time-Dependent Plasticity in HfO2-Based RRAM and Applications for Pattern RecognitionOne learning epoch. a Waveforms used for the learning epoch, including pre I, pre II and post, which correspond to input information 0, 1, and feedback signal. Parameter t f means integrating time required to fire post-neuron. b The evolution of synaptic weights map. Black pixels and white pixels learned at time t and 2t, respectivelyBack to article page