title: Recording of unit activity on paper charts.
mesh_terms: D000818:Animals; D001307:Auditory Perception / Q000502:physiology*; D005072:Evoked Potentials, Auditory; D008636:Mesencephalon / Q000502:physiology*; D009482:Neurophysiology / Q000295:instrumentation* / Q000379:methods; D051381:Rats