Maes has proposed a mechanism for action selection (behavioral choice)
(Maes, 1989, 1990, 1991a), which is reviewed here and is evaluated us
ing a simulated environment. This simulated environment is a detailed
and complex generalized model of the action selection problem faced by
an animal in the wild and presents a rather severe test for an action
selection mechanism. The results of testing Maes's mechanism in the s
imulated environment are discussed, some observed deficiencies in the
mechanism's operation are described, and the computational reasons und
erlying the deficiencies are explained. It is argued that some central
aspects of the design of Maes's mechanism mean that it is not able to
deal well with animal-like action selection problems.