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L M an adequate level weight range function wr can be given by
Example 2. For
wr
(pn)=[0
.
75
,
1]
(
δ pn =0
.
25)
wr
(sn)=[0
.
55
,
0
.
85]
(
δ sn =0
.
3)
wr
(
lb
)=[0
.
35
,
0
.
65]
(
δ lb =0
.
3)
wr
(
es
)=[0
.
15
,
0
.
45]
(
δ es =0
.
3)
wr
(
sa
)=[0
,
0
.
25]
(
δ sa =0
.
25)
Notice, that the weight ranges of motive levels might overlap in order to allow for
situations where some less basic motive has a stronger influence than some more basic
motive. We come back to this issue when taking the reliability of the environment into
account.
These ranges describe the general importance of a motive level. The actual importance
of a motive level at some point in time, called level weight , is given by a function
w
: L→ [0
,
1]
which maps a motive level L
∈L
to an element of its level weight
range, i. e. w
.Let W denote the set of all such functions w .
While weight ranges are assumed to be fixed, level weights are subject to change when
an agent acts in some environment and perceives new information about the world.
The weights of motive levels control how desires are created. The links between
motives and desires are provided by motive couplings .
(
L
)
wr
(
L
)
for all L
∈L
Definition 2. A motive coupling mc is a tuple
(
m, D, cs, φ
)
with m
Mot ,adesire
D , cs
[ 1
,
1]
, and φ some sentence in the language of the beliefs of the agent. Let
MC
denote the set of all motive couplings. For a motive coupling mc
=(
m, D, cs, φ
)
we abbreviate D
(
mc
)=
D , L
(
mc
)=
L
(
m
)
and φ
(
mc
)=
φ .
A motive coupling
denotes some tendency of a motive m to influence the
creation of a desire D positively ( cs >
(
m, D, cs, φ
)
) with coupling strength
cs if some statement φ can be verified in the beliefs of the agent. There, φ represents a
condition that may trigger the coupling according to the given situation. That is, if for
the current beliefs B ,wefindthat B
0
)ornegatively( cs <
0
φ , then the coupling between motive m and
desire D is activated to the degree cs .Let
| =
D
denote the set of desires that appear in
some motive coupling.
Example 3. Let us consider the motive “ environmental awareness ”. This motive is a
strong influence on the desire “ save the whales ” with e. g. a coupling strength of
9
and a relatively weak influence for the desire “ buy fruits from your own country ” with
e. g. a coupling strength of
0
.
. Furthermore, it exhibits a negative influence on the
desire “ buy a sports car ” with e. g. a coupling strength of
0
.
3
0
.
9
.
Definition 3. A motive state M is a tuple M =( M,MC,wr,w )
with
M⊆ Mot ,
MC ⊆MC
denotes the
actual weight of each motive level. Let Ω denote the set of all motive states.
, wr is a level weight function on
L
, and w
: L→wr ( L )
We assume the beliefs of an agent to be represented in some logic. Let B be the belief
state of an agent at some point in time with B
∈B
and
B
denotes the set of all possible
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