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The synaptic weight modification as a function of a 
caricature of four cases. A Hebbian temporally asymmetric STDP, e.g., Bi and Poo [11] for an excitatory synapse. B Anti-Hebbian temporally asymmetric STDP, e.g., [21], [22]. C Hebbian temporally asymmetric STDP - inhibitory (entorhynal) cortical synapse, e.g., Haas et al. [50]. D Hebbian temporally symmetric STDP - inhibitory hippocampal synapse, e.g., Woodin et al. [49].
