Figure 4. Contribution of sodium conductance g_Na and potassium conductance of delayed rectifier g_K(DR) in a layer V pyramidal neuron with varying active channel properties.

Top four rows: intracellular potentials at basal dendritic terminal (row 1), soma (row 2), first branching point of the apical dendrite (row 3), and apical dendritic terminal (row 4). Bottom three rows: current dipole moments of whole cell (row 5), apical dendritic segment (row 6) and basal dendritic segment (row 7). A, cell with g_Na and g_K(DR) only in the soma with passive basal and apical dendrites. B, cell with g_Na and g_K(DR) distributed throughout the basal and proximal apical dendrites up to the first branching point. C, same as cell in b except g_Na and g_K(DR) were distributed uniformly throughout the dendrites. g_Na = 40 pS μm⁻² for cells in A–C. D, same as cell in c except g_Na = 100 pS μm⁻².