Biofeedback With Heart Sound Following Trauma

Inclusion Criteria: * 30 earthquake survivor university students between 20 and 25 will participate in the experiment. Participants will be healthy, non-obese men (n=15) and women (n=15). In particular, all participants should have experienced the earthquake disaster in the local region. All participants must be free of any chronic or acute infection, neurological, psychiatric, and/or cardiovascular disease. Exclusion Criteria: * They must be non-smokers, have no alcohol or drug addiction, and not be under any medical treatment. Pregnant or breastfeeding women will not be included in the study.