01880nas a2200169   4500008004100000022001400041245013300055210006900188260001200257300001200269490000700281520131900288653001801607100001701625700002101642856004701663       1982                        eng d  a0013-469400aScalp distribution of human auditory evoked potentials. II. Evidence for overlapping sources and involvement of auditory cortex.0 aScalp distribution of human auditory evoked potentials II Eviden  c07/1982  a25–380 v543 aThe scalp distributions of human auditory evoked potentials (AEPs) between 20 and 250 msec were investigated using non-cephalic reference recordings. AEPs to binaural click stimuli were recorded simultaneously from 20 scalp locations over the right hemisphere in 11 subjects. Computer-generated isovoltage topographic maps at high temporal resolution were used to assess the stability of AEP scalp distributions over time and relate them to major peaks in the AEP wave forms. For potentials between 20 and 60 msec, the results demonstrate a stable scalp distribution of dipolar form that is consistent with sources in primary auditory cortex on the superior temporal plant near the temporoparietal junction. For potentials between 60 and 250 msec, the results demonstrate changes in AEP morphology across electrode locations and changes in scalp distribution over time that lead to two major conclusions. First, AEPs in this latency period are generated by multiple sources which partially overlap in time. Second, one or more regions of auditory cortex contribute significantly to AEPs in this period. Additional data are needed to determine the relative contribution of auditory cortex sources on the superior temporal plane and the lateral temporal surface and to identify AEP sources outside the temporal lobe.10aTemporal Lobe1 aWood, C., C.1 aWolpaw, Jonathan  uhttp://www.ncbi.nlm.nih.gov/pubmed/6177515