How might volumeconductor theory aid in the analysis of evok

How might volume-conductor theory aid in the analysis of evoked cortical potentials produced by specific repetitive stimuli (auditory, visual, etc.)?

Solution

Let\'s first define the evoked potential or evoked response, which is an electrical potential recorded from the nervous system of a human or other animalfollowing presentation of a stimulus, as distinct from spontaneous potentials as detected by electroencephalography (EEG),electromyography (EMG), or other electrophysiologic recording method. Here Volume conduction, a term used in bioelectromagnetism, can be defined as the transmission of electric or magnetic fields from an electric primary current source through biological tissue towards measurement sensors. In the considered low-frequency band (frequencies below 1000 Hz), the capacitive component of tissue impedance, the inductive effect and the electromagnetic propagation effect can be neglected, so that the transmission can be modeled with the quasi-static Maxwell equations (Plo67; Sar87; Mun91). The volume conductor is represented through the conductivity distribution of the different tissues through which the fields are transmitted.