energy in the 0 to 50 ms time window, in response to standard and rare tones, may mediate the reduction in N1a amplitudes in B6 mice, compared to D2 mice. Consistent with their reduced N1a amplitudes (Ehlers and Somes, 2002), lower evoked alpha/beta band energy in B6 mice were observed in both frontal and parietal cortices. The negative values of the baseline-corrected delta ERO energy in the 0 to 50 ms time window suggest a significant reduction, below baseline ERO energy levels, in frontal and delta ERO energy following presentation of all auditory tones (0 to 50 ms time window). Compared to D2 mice, B6 mice showed a significant attenuation of the reduction in evoked parietal delta band in the 0 to 50 ms time window. While the functional significance of these findings is presently unclear, attenuation of this time-dependent inhibitory effect on delta ERO energy may be also contributing to the reduced N1a amplitudes in the parietal cortex of B6 mice.
