Figure 2.

Auditory stimulation paradigm. Each stimulation block consisted of 20 repetitions of the same stimulus (either speech or piano), which was situated within a period of silence and jittered to minimize physiological confounds (see Materials and Methods for details). The same design was used for the EEG and fMRI recording sessions. In 30% of blocks, a quieter stimulus was presented in place of one of the last four stimuli (indicated in red). Subjects were asked to indicate whether there had been an oddball after each block to control for attention.