Figure 4
Spectral power changes relative to the pre-cue baseline in visual cortex on the left and auditory cortex on the right.
Grand average time-frequency representations of spectral power corresponding to the change onset time window were averaged across conditions and all grid points within the respective region of interest (depicted as dark areas on horizontal MRI slices). Overall, the pattern of source-level spectral changes in the sensory cortices closely correspond to the global sensor-level changes shown in Fig. 2. (A,D) Time-frequency representations of spectral power for higher frequencies. (B,E) Time-frequency representations of spectral power for lower frequencies. (C,F) Bar plots illustrating the differential effect of attention for each frequency band. Bars represent grand means, and circles represent data from each participant to illustrate interindividual variance. All mean deviations from zero are significant. At the group level, spectral power in theta-, alpha-, and beta-band decreased while gamma-band power increased in both visual and auditory cortex.
