Electrode impedance is defined as the opposition to which type of current flow?

Electrode impedance specifically refers to the opposition that electrodes present to alternating current (AC) flow. In the context of neurophysiological monitoring, AC is commonly utilized because it allows for the measurement of bioelectrical signals generated by bodily functions, such as neuronal activity. Impedance can affect the quality of the signals recorded; thus, understanding and managing this opposition is critical for accurate data collection.

While direct current (DC) is used in some applications, such as galvanic skin response, it is not relevant to electrode impedance measurement in this context. On the other hand, differential current flow is more a concept related to how various signals are processed and compared rather than the inherent characteristics of electrode impedance. Lastly, 60 Hz artifact pertains to noise from electrical interference rather than a type of current flow, making it unrelated to the concept of impedance itself. This reinforces the accuracy of the definition of impedance as it pertains specifically to the behavior of electrodes with alternating current.