Theories
Scholar Hilda Ellis-Davidson draws a parallel between berserkers and the mention by the Byzantine emperor Constantine VII (AD 905–959) in his book De cerimoniis aulae byzantinae ("Book of Ceremonies of the Byzantine court") of a "Gothic Dance" performed by members of his Varangian Guard (Norse warriors working in the service of the Byzantine Empire), who took part wearing animal skins and masks: she believes this may have been connected with berserker rites.
The actual fit of madness the berserker experienced was referred to as berserkergang ("going berserk"). This condition has been described as follows:
This fury, which was called berserkergang, occurred not only in the heat of battle, but also during laborious work. Men who were thus seized performed things which otherwise seemed impossible for human power. This condition is said to have begun with shivering, chattering of the teeth, and chill in the body, and then the face swelled and changed its colour. With this was connected a great hot-headedness, which at last gave over into a great rage, under which they howled as wild animals, bit the edge of their shields, and cut down everything they met without discriminating between friend or foe. When this condition ceased, a great dulling of the mind and feebleness followed, which could last for one or several days.Theories about what caused berserker behaviour include ingestion of materials with psychoactive properties, psychological processes, and medical conditions.
Some scholars believe certain examples of berserker rage to have been induced voluntarily by the consumption of drugs such as the hallucinogenic mushroom Amanita muscaria. or massive amounts of alcohol. While such practices would fit in with ritual usages, other explanations for the berserker's madness have been put forward, including self-induced hysteria, epilepsy, mental illness or genetics.
Jonathan Shay, MD, makes an explicit connection between the berserker rage of soldiers and the hyperarousal of post-traumatic stress disorder. In Achilles in Vietnam he writes:
If a soldier survives the berserk state, it imparts emotional deadness and vulnerability to explosive rage to his psychology and permanent hyperarousal to his physiology — hallmarks of post-traumatic stress disorder in combat veterans. My clinical experience with Vietnam combat veterans prompts me to place the berserk state at the heart of their most severe psychological and psychophysiological injuries.Read more about this topic: Berserker
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