Short-term memory (STM) and long-term memory (LTM). (a) Schematical diagram for the multistore model. (b) Continuous increase in PSC changes with the increased pulse intensity. (c) A fading memory behavior. (d) LTP/LTD characteristics of the CuPc/p-6P optoelectronic synapse for neuromorphic computing. (b) and (d) Reprinted with permission from Refs. [48,97], Copyright 2019, Elsevier.