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The model was used to compare the electrotonic length of the Purkinje cell in the presence and absence of active dendritic conductances. The electrotonic distance from soma to the tip of the most distal dendrite increased from 0.57 λ in a passive model to 0.95 λ in a quiet model with active membrane. During a dendritic spike generated by current injection the distance increased even more, to 1.57 λ.