Auditory cortex region of interest. The voxels stongly activated by sound sequences along the superior temporal gyrus are shown in red. Significance threshold was corrected for multiple comparisons by Bonferroni correction. Activity in this ROI showed a significant effect of perceptual state (p < .05). The average beta across the ROI and subjects is negative, indicating that the split percept results in higher levels of activation within AC than during the grouped percept.