Papers will be obtained from MEDLINE, PubMed, PubMed Central, and PsycInfo. To find papers related to how violence-induced trauma can affect dopaminergic activation, the following terms will be used: trauma, violence, aggression, assault, abuse, conflict, stress, adversity, maltreatment, PTSD, dopaminergic function or system, and dopamine (activation). If the study participants are more than 20 years old, a follow-up study supporting the results will be included. The inclusion criteria will be animal studies and peer-reviewed articles. The exclusion criterion will be a non-peer-reviewed article or irrelevant research subject (not a rat model). The screening process will include the following steps: title and abstract screening, full-text review, and quality assessment. For quality assessment, prospective design, ascertainment of exposure, ascertainment of outcome, and control for confounding will be evaluated. To summarize the studies that are obtained, a narrative review of the association between violence-induced trauma and dopamine activation will be performed. The studies will be categorized according to the following categorization criteria: baseline vs. stimulus-induced and acute vs. chronic effects. The studies will be analyzed later using a fixed-effect model. The following equation will be utilized: Dopamine Activationi=α+β×Traumai+ϵi. Finally, Egger’s test will be used to ensure the robustness of the results.