  Interaction of electromagnetic (EM) waves with human tissue has been a
longstanding research topic for electrical and biomedical engineers. However,
few numbers of publications discuss the impacts of external EM-waves on neural
stimulation and communication through the nervous system. In fact, complex
biological neural channels are a main barrier for intact and comprehensive
analyses in this area. One of the everpresent challenges in neural
communication responses is dependency of vesicle release probability on the
input spiking pattern. In this regard, this study sheds light on consequences
of changing the frequency of external EM-wave excitation on the post-synaptic
neuron's spiking rate. It is assumed that the penetration depth of the wave in
brain does not cover the postsynaptic neuron. Consequently, we model
neurotransmission of a bipartite chemical synapse. In addition, the way that
external stimulation affects neurotransmission is examined. Unlike multiple
frequency component EM-waves, the monochromatic incident wave does not face
frequency shift and distortion in dispersive media. In this manner, a single
frequency signal is added as external current in the modified leaky
integrated-andfire (LIF) model. The results demonstrate existence of a node
equilibrium point in the first order dynamical system of LIF model. A fold
bifurcation (for presupposed LIF model values) occurs when the external
excitation frequency is near 200 Hz. The outcomes provided in this paper enable
us to select proper frequency excitation for neural signaling. Correspondingly,
the cut-off frequency reliance on elements' values in LIF circuit is found.
