Information Technology Reference
In-Depth Information
3.5
Preferences
Preferences describe the agent personal likes for each physical object of its environ-
ment. They are represented as PDDL functions of the form:
(= (preference apple) 5)
These values are not modified during the planning process and they are between zero,
for the detested objects, and ten, for the favourite ones. Preferences can also describe
the agent personal likes for each action. They are represented as PDDL functions of the
form:
(= (read-preference) 5)
Again, these values are not modified during the planning process and they are between
zero, for the detested actions, and ten, for the favourite ones. Preferences affect the
direction and degree of changes on the value of the valence, produced by the effects of
actions.
3.6
Activations
Activations describe the effect over the agent arousal for each physical object of its
environment. They are represented as PDDL functions of the form:
(= (activation apple) 5)
These values are not modified during the planning process and they are between zero,
for the objects that relax, and ten, for the objects that agitate. Activations can also de-
scribe the effect over the agent arousal for each action. They are represented as PDDL
functions of the form:
(= (read-activation) 5)
Again, these values are not modified during the planning process and they are between
zero, for the actions that relax, and ten, for the actions that agitate.
3.7
Actions
Actions defined in the domain describe activities that the agent may carry out. Each
action has a simulated duration (time spent in the virtual world). This duration is de-
termined from a standard time that takes to execute the corresponding action and the
agent's value of conscientiousness. There are five types of actions:
-
Actions to cater for its needs:
Each one of these actions needs one
object of a specific type to decrease in one unit its corresponding drive value. In this
group of actions, we have defined:
eat
,
drink
,
sleep
,
bath
,
shower
,
play
,
read
,
watch
and
listen
. Some of these actions require that the agent has taken
the object used, like
eat
,
drink
or
read
. Others, however, only require that the
object is located in the same room of the agent, like
bath
or
sleep
. In addition,
some actions such as
eat
and
drink
decrease the available amount of the object
used.
