Currently, the treatment of cognitive dysfunction after acute TBI remains a challenge, and novel therapeutic methods are urgently needed. Median nerve stimulation (MNS) is a non-invasive neuromodulation technique and recently has shown positive effects in awaking coma of acute brain injury. It has been shown to improve cognition in healthy volunteers and may be a potential therapeutic approach for cognitive dysfunction in patients with acute TBI. Therefore, the main purpose of the study is to evaluate the feasibility, safety, and preliminary efficacy of MNS for cognitive dysfunction in patients with acute TBI.