Humans are capable of self sacrifice for a cause. Duty, honor, love of one's homeland, spiritual convictions, etc. These are psychological motives and forces a

Humans are capable of self sacrifice for a cause. Duty, honor, love of one's homeland, spiritual convictions, etc. These are psychological motives and forces and their factual impact on the subject person is observable. I just recently saw Eien no Zero (aka The Eternal Zero). If that movie reflects the actual events, then the pilots were subject to serious psychological stress coming to terms with their duty to Japan. If we can ever measure 'psychological stress' in ants, then we can observe if they experience a shift from a normal psychological state to a stressful one before "deciding" to sacrifice themselves on whatever heroic ant task awaits them.