High-frequency effects in the FitzHugh-Nagumo neuron model
  The effect of a high-frequency signal on the FitzHugh-Nagumo excitable model is analyzed. We show that the firing rate is diminished as the ratio of the high-frequency amplitude to its frequency is increased. Moreover, it is demonstrated that the excitable character of the system, and consequently the firing activity, is suppressed for ratios above a given threshold value. In addition, we show that the vibrational resonance phenomenon turns up for sufficiently large noise strength values. 
David Cubero (1), Jos\'e Pablo Baltan\'as (2), Jes\'us Casado-Pascual   ((1) F\'isica Te\'orica, Universidad de Sevilla, Spa...