Mystery Number Five - Computational Linguistics and Talking Robots - page 90

Each of these fixed stimulus-response pairs may be utilized for (i) conspecific
communication, e.g., as a mating dance or a greeting, or for (ii) non-communi-
cative behavior, e.g., hiding by wiggling into the sand or as a pattern of flight.
In adaptive behavior (Sect. 5.5), recognition action events are recorded in
the temporal order of their arrival in the Word Bank. This is indicated by using
natural numbers as prn values, as in the extrapropositional coordination 3.2.5.
In fixed behavior, in contrast, recognition action sequences are used as pat-
terns. When triggered, they are repeated without keeping track of individual
instances. 1 This is indicated by using prn values consisting of two parts, a
letter common to all proplets of the sequence and subscripted natural num-
bers specifying the order within the sequence. Consider the following set of
proplets, which codes the first behavior pattern in 6.1.1:

6.1.2 C ODING MOTION TRIGGERED BY red AS SET OF PROPLETS
⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

rec: red
prev:
next: strght
prn: x 1

act: strght
prev: red
next: left
prn: x 2

act: left
prev: strght
next: right
prn: x 3

act: right
prev: left
next: strght
prn: x 4

act: strght
prev: right
next: right
prn: x 5

act: right
prev: strght
next: left
prn: x 6

act: left
prev: right
next:
prn: x 7

The sequence begins with a red proplet, which represents the stimulus acti-
vating the motion pattern. The next attribute of the red proplet has the value
strght ,the next attribute of the strght proplet has the value left ,etc.
Similarly for the other two motion patterns of 6.1.1:

6.1.3 C ODING MOTION TRIGGERED BY green AS SET OF PROPLETS
⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

rec: green
prev:
next: strght
prn: y 1

act: strght
prev: green
next: left
prn: y 2

act: left
prev: strght
next: strght
prn: y 3

act: strght
prev: left
next: left
prn: y 4

act: left
prev: strght
next: strght
prn: y 5

act: strght
prev: left
next: left
prn: y 6

act: left
prev: strght
next:
prn: y 7

6.1.4 C ODING MOTION TRIGGERED BY blue AS SET OF PROPLETS
⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

rec: blue
prev:
next: strght
prn: z 1

act: strght
prev: blue
next: right
prn: z 2

act: right
prev: strght
next: strght
prn: z 3

act: strght
prev: right
next: right
prn: z 4

act: right
prev: strght
next: strght
prn: z 5

act: strght
prev: right
next: strght
prn: z 6

act: right
prev: strght
next:
prn: z 7

The storage and retrieval of these sequences in a Word Bank is content-
addressable, but their activation is not for deriving new content.
Therefore, fixed behavior uses only a fixed amount of memory, in contradis-
tinction to adaptive behavior. This means that a non-writable memory is suffi-
cient for modeling fixed behavior.