Memories are indispensable for individuals as well as social groups. Forgetting not only means loss of functioning but also loss of identity. Memories can also be hurting and cause problems, as research on posttraumatic stress disorders (PTSD) has shown. This is true for individuals as well as social groups and even societies. Memories and especially negative memories can escape the control of the individual. Many political conflicts can only be understood when taking history and memories into account.

In this volume a comprehensive scientific overview is given on the development of...

Embitterment is a distinct state of mood known to everyone. It can be seen in the context of exceptional though "normal" negative life events. It is an emotional reaction e.g. to humiliation, to being severely disappointed by others, or to violations of basic values. Embitterment is accompanied by other emotions like feelings of hopelessness and helplessness, poor moods and a lack of drive, and aggression towards oneself and others. It can end in suicide or even murder-suicide and in a distinct pathological state known as "Posttraumatic Embitterment Disorder (PTED)." But despite the high...