01222nas a2200157   4500008004100000022001400041245011400055210006900169260001200238300001400250490000700264520070900271653001800980100002100998856004501019       1979                        eng d  a0013-469400aSingle unit activity vs. amplitude of the epidural evoked potential in primary auditory cortex of awake cats.0 aSingle unit activity vs amplitude of the epidural evoked potenti  c09/1979  a372–3760 v473 aThe study investigated, in primary auditory cortex (AI) of awake cats, the relationship over a range of stimuli between the amplitude and latency of the initial positive deflection (P1) of the primary evoked potential and the intensity of concurrent underlying evoked single unit activity. Epidural evoked potentials and extracellular responses of 155 single units to monaural 100 musec clicks ranging from 45 to 110 dB were recorded. At low stimulus levels, considerable unit response could occur with a very small P1. At middle stimulus levels, unit response was directly proportional to P1 amplitude. At higher stimulus levels, P1 amplitude continued to increase while unit response began to saturate.10aReaction Time1 aWolpaw, Jonathan  uhttp://www.ncbi.nlm.nih.gov/pubmed/90607