Multimodal Transition and Excitability of a Neural Oscillator
L.S. Borkowski
Department of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 PoznaƄ, Poland
Received: March 29, 2012; in final form: June 27, 2012
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We analyze the response of the Morris-Lecar model to a periodic train of short current pulses in the period-amplitude plane. For a wide parameter range encompassing both class 2 and class 3 behavior in the Hodgkin classification there is a multimodal transition between the set of odd modes and the set of all modes. It is located between the 2:1 and 3:1 locked-in regions. It is the same dynamic instability as the one discovered earlier in the Hodgkin-Huxley model and observed experimentally in squid giant axons. It appears simultaneously with the bistability of the states 2:1 and 3:1 in the perithreshold regime. These results imply that the multimodal transition may be a universal property of resonant neurons.
DOI: 10.12693/APhysPolA.122.776
PACS numbers:, 87.19.ll, 87.19.ln