Figure 1. Time courses of activity in the left and right auditory cortices. a, Mean strengths of the auditory-cortex sources (n = 12) as a function of time during processing of all sounds (“ba,” “da,” and “ga”) in the ignore and attend conditions. Attention did not modulate activity during the first two time windows (60–100 and 110–150 ms). In later time windows, activity was modulated by attention (main effects of attention: 170–210 ms, F(1,11) = 7.49, p < 0.01; 220–270 ms, F(1,11) = 16.80, p < 0.01). b, The location of the sources, modeled as current dipoles at the peak latency of N100m, in one participant superimposed on her MRI scan. In both hemispheres, these sources are located in the superior temporal cortex in the vicinity of the Heschl's gyrus.