The somatic marker hypothesis has been considered to promote decision-making in cognitive control, however, its detailed neural mechanisms are still unclear. We investigate dynamic behaviors of the dorsal anterior cingulate cortex (dACC) and corresponding peripheral outcomes using EEG and EMG during the Simon task. We found that successful task performance exhibited muscular outputs prior to movements accompanied with dACC deactivation. Such peripheral responses were absent in a control task operating under the Simon task paradigm where no movements were required. These findings suggest that the dACC regulates decision-making with somatosensory information of muscular feedback. This insight supports the somatic marker hypothesis.