Abstract
Human behavior under risky or dangerous situations is considered somewhat irra-
tional from the viewpoint of objective risks. Recent studies have shown that it is
innate in nature and had been acquired in the process of evolution. This means that
such behavior is adaptive and must have some kind of efficiency or advantage in natural
selection. This paper constructs a simulation model of the human evolution process and
tries to acquire risk related behavior of Agents. Agents, which simulate life histories of
humans, have shown risk accepting behavior over a large parameter space that specifies
the environmental condition in which the evolution takes place. The relation between
behavior under risky situations and life histories of organisms is also discussed.
