In recent years, synaptic plasticity, which is dependent on the order and time interval of pre- and post-synaptic spikes, has been observed by physiological experiments. There are two types of STDP which are characterized by an asymmetric time window and a symmetric time window (mexican hat type window). A symmetric time window especially depends on the influence of an inhibitory neuron. In this paper, we investigate the synaptic circuit and the synaptic weight control circuit using STDP by inhibitory interneuron input or no input. As a result, we show that the synaptic circuit using STDP with the time windows of these two types could be constructed with a simple circuit configuration considering an inhibitory interneuron by using the circuit simulator PSpice. Furthermore, we show the characteristic of reinforcement and suppression.
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