Coronal topography of the middle latency auditory evoked potentials (MLAEPs) in man.

Scalp recorded middle latency auditory evoked potentials (MLAEPs) were obtained from 7 human subjects to monaural click stimulation from a coronal chain of 7 electrodes extending from a point anterior to Cz to the mastoid prominence. All electrode outputs were referred to the tip of the nose. Polarity reversals of Pa occurred between the fourth and fifty coronal electrodes, while reversals of Na for Nb were inconstant. Voltage gradients for Pa along the coronal chain are maximal at the level of polarity reversal. Polarity reversals of components of the brain stem auditory evoked potential (e.g., wave 5) occurred just below the level of MLAEP inversion.