Figure 6

Single trial average. Single trial average BOLD responses of left and right insula during evoked and spontaneous stimuli (see text for details). Percent signal change was calculated based on the following: (y - $\overline{\text{y}}$ * 100)/$\overline{\text{y}}$, where y represents the mean time series and $\overline{\text{y}}$ is the mean of the mean time series. Error bars represent standard error of the mean across trials. Note the early onset of the BOLD response following the evoked tic (see text).