Contribution of different neural structures (dendrites, soma, axon) to the model-based cortical evoked potential (cEP) response. Model-based cEP responses to 60%, 4.5-Hz subthalamic nucleus deep brain stimulation were computed from currents from dendrites, soma, and axons (A1), only dendritic currents (A2), only somatic currents (A3), and only axonal currents (A4) of model cortical neurons. ECoG, electrocorticographic recordings.