Evolutionary processes in suicide.

Suicidal behavior contains several dynamic elements. Due to its complexity, empirical science may approach suicide through various avenues. One underutilized approach is taking an evolutionary perspective. Our review of the literature presents two evolutionary processes that may be implicated in suicidal behavior, namely eusocial behavior and antipredator response behaviors. Studies have indicated that aspects of suicidal behavior parallel self-sacrificial behavior in eusocial animals, and that systems similar to hyperarousal-shutdown systems involved in antipredator behaviors may be activated among suicidal individuals. Research on brain activity and decision-making processes among suicidal individuals also suggests that eusociality and antipredator response behaviors in suicide may not be mutually exclusive. These processes represent novel sources of information and potential solutions regarding suicide.