The goal of this observational retrospective study is to evaluate the electroencephalography (EEG)'s poficiency in the treatment of neuroelectric stimulation in patients with severe traumatic brain injuries (TBI).

The main questions it aims to answer are:

1. Whether EEG of patients with severe TBI will change after they receiving neuroelectrial stimulation? If yes, how does it change?
2. How can EEG be used to evaluate the condition of patients with severe TBI?

Inclusion Criteria:

• 7 days after severe traumatic brain injuries (GCS score 3-8);
• Over 18 years old, regardless of gender;
• The patient's legal representative is informed and voluntarily signs the consent form.

Exclusion Criteria:

• Unstable vital signs;
• History of mental disorders or neurodegenerative diseases;
• Uncontrolled epilepsy;
• Severe arrhythmias or patients with implanted cardiac pacemakers;
• Various conditions that interfere with scalp EEG collection;
• Pregnant women.

Patients have severe TBI and receive neuroelectral stimulation.