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Error bar plot for the differences for each participant (blue lines) during the noise task. The means and SEs are also shown (red line) during each task for all participants, with the total amplitude of SCRs as the parameter of interest. The black line is the zero axis, and the green lines are the a priori defined boundaries (size of reference effect). The noise task has the same baseline given as for the SSST, and every number represents a beep
