the 7-34 Hz frequencies as compared to paradigm 1(rare tone paradigm 3=1280 ± 575, rare tone paradigm 1 1087 ± 626; F=9.8, df=1,64, p<0.003) and a decrease in the total volume of the 350-800 msec region of interest in the 7-34 Hz frequencies (rare tone paradigm 3=5007 ± 1962, rare tone paradigm 1=5785 ± 2554; F=9.9, df=1,64, p<0.002). Again, the reduction in total volume may be related to the N1a component as previously published data has demonstrated that the N1a component of the ERP recorded at this site in this latency range is significantly larger following the rare tone when compared to the standard for this paradigm; whereas, no changes were observed in the late positive components in this paradigm as a function of difference in stimulus loudness (Ehlers & Somes, 2002).
