  This paper proposes a model for combination of external and internal stimuli
for the action selection in an autonomous agent, based in an action selection
mechanism previously proposed by the authors. This combination model includes
additive and multiplicative elements, which allows to incorporate new
properties, which enhance the action selection. A given parameter a, which is
part of the proposed model, allows to regulate the degree of dependence of the
observed external behaviour from the internal states of the entity.

Artificial Intelligence