IRCT201109247537N1 IRCT 2012-06-07 Research Vice Chancellor of Mazandaran University 0f Medical Science and Health Service Auditory stimulation in level of consciousness of comatose patients Comparison of the effect of auditory sensory stimulation with familiar and unfamiliar voices in level of consciousness of traumatic comatose patients admitted to ICU, educational and traputic centers of mazandaran university of medical sciences, 2011. 2011-06-10 anticipated 45 Complete https://irct.ir/trial/8043 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive. 2-3 Brain injury. Intervention 1: First group (stimulation with familial voice)2 times per day for 15 minutes till 14 day were stimulated. Intervention 2: Second group (auditory stimulation by researcher introduced as a nurse) 2 times per day for 15 minutes till 14 day were stimulated. Intervention 3: The control group, but the usual sounds of the environment, stimulation did not receive a hearing.