In order to understand the mechanism differentiating responses among dendritic sectors, we compared sector I to sector II, which showed a remarkably different pause lengths. The impact of dendritic structure was considered first (Figure 7A). The local currents generated by synaptic activation (that were identical in the two sectors) caused a stronger depolarization in sector II than sector I. This reflected the different Zin, that was about twice as large for sector II than sector I. Accordingly, this determined different voltage attenuation profiles, so that sector I depolarization started from a higher level and then decayed over a longer distance while approaching the soma. It should be noted that, in these simulations, we used single-synapse stimuli causing small depolarizations from a hyperpolarized membrane potential, so that voltage-dependent currents were not remarkably activated.