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Cognitive load was inferred from the amount of time subjects spent rating different sensation intensities. For ACUP, subjects spent more of the scan run (330sec total) rating both low (10-40) and moderate (40-70) sensations than for SHAM. In turn, subjects experiencing SHAM spent more time rating minimal to no sensation (0-10). No difference was found for strong sensations. n.b. error bars represent standard deviation. *** p < 0.001, ** p < 0.005, * p < 0.05
