Although aggression has multiple causes, in psychiatric practice the most problematic forms arise from anger. Many stimuli can provoke anger, but the most common are the irritations and frustrations that arise from events that restrict freedom of action or access
Panksepp opens his foundational chapter on the RAGE system by grounding its clinical significance in the frustration-aggression nexus, establishing anger as the primary neurobiological source of pathological aggression.
, Affective Neuroscience The Foundations of Human and Animal, 1998thesis