curves for simple models of type 1 and A type 2 behavior A: 6-variable Connor 3 20 et al. model of molluscan neuron 8150 NE incorporating A-type K+conductance showing type 1 50 behavior(Connor et al.1977) 100150200 B: 4-variable (A/cm) I (HA/cm) Hodgkin-Huxley model of the squid 250 giant axon membrane Zoo patch, showing type 2 behavior(Hodgkin and Huxley 1952) 910 C: 2-variable morris ecar model with type 1 parameters lorris and lecar 50100150200 % 1981) I HA/cm) I HA/cI D: Morris-Leca model with type 2 parameters• f–I curves for simple models of type 1 and type 2 behavior. • A: 6-variable Connor et al. model of molluscan neuron, incorporating A-type K+conductance, showing type 1 behavior (Connor et al. 1977). • B: 4-variable Hodgkin–Huxley model of the squid giant axon membrane patch, showing type 2 behavior (Hodgkin and Huxley 1952). • C: 2-variable Morris– Lecar model with type 1 parameters (Morris and Lecar 1981). • D: Morris–Lecar model with type 2 parameters