Localization of a 50 msec latency auditory evoked field component.
D000328:Adult; D001306:Auditory Pathways / Q000033:anatomy & histology / Q000502:physiology*; D001931:Brain Mapping; D005072:Evoked Potentials, Auditory; D006801:Humans; D008279:Magnetic Resonance Imaging; D008280:Magnetics; D008875:Middle Aged; D011930:Reaction Time