Which electrode is used as the active electrode for BAEP Waves 2-5?

The correct choice for the active electrode used for Brainstem Auditory Evoked Potentials (BAEP) waves 2-5 is indeed the central vertex electrode, commonly known as Cz. In the context of BAEP testing, the active electrode is strategically placed to capture the most relevant electrical activity from the brainstem triggered by auditory stimuli.

Cz is situated at the top of the head and is essential for recording signals that represent the cortical response to sound, as it overlaps with the area of the brain where significant auditory processing occurs. This positioning enables accurate detection of neuronal activity associated with the specific waveforms that correspond to the ascending auditory pathways, particularly those represented by waves 2 through 5.

Other electrodes, such as A1 (left ear) and Aipsi-t (a nearby temporal placement), may be referenced or used for other purposes in the BAEP evaluation, but Cz is specifically designated to effectively analyze the main features of auditory brainstem responses in the waves of interest. Understanding which electrodes to use and their placement is crucial for clinicians conducting auditory assessments and neurodiagnostic testing.