Battle trance is a term denoting a specific altered state of consciousness that characterizes the psychological state of combatants during a combat situation. In this state, combatants do not feel fear (for this state, Joseph Jordania uses a term "aphobia") or pain (analgesia), and all the individual members of group (unit) are acting as one collective organism. In this state humans lose their individuality and acquire shared collective identity. In a battle trance humans may behave very differently, from extremely altruistically (to the point of sacrificing themselves to save others), to the extremely aggressively (to the point of participating in mass murders). Battle trance affects both men and women and can be induced in individuals as well as groups. Battle trance state may occur involuntarily (for example, mother acting in total disregard of her own safety when her child is suddenly attacked), or can be induced by ritualistic behavior, involving loud rhythmic group singing, stomping and drumming on external subjects, as well as the use of different psychogenic substances.