A dynamic interaction between <i>I_h</i> and <i>K_M</i> can show a crossover effect only in special cases.

<p><b>a</b>) (<i>left</i>) peak somatic membrane potential as a function of stimulus strength in a non spiking single-compartmental model, with (<i>red</i> traces) or without <i>I_h</i> (<i>black</i> traces) and different values for the <i>K_M</i> peak conductance, <i>g_KM</i>; note the large depolarization with <i>g_KM</i> = 0; (<i>right</i>) same as in the <i>left</i> panel but using a spiking single-compartmental model; insets show somatic potential during a current clamp of 0.5 or 0.05 nA with or without <i>K_M</i>, respectively. <b>b</b>) peak somatic membrane potential as a function of stimulus strength using the full realistic morphology with (<i>red</i> traces) or without <i>I_h</i> (<i>black</i> traces) and two different <i>K_M</i> channel distributions; insets show somatic potential during a current clamp in the two cases, respectively.