Mystery Number Five - Computational Linguistics and Talking Robots - page 94

system (record player) which must bear the burden of handling additional mo-
tion patterns, but an extension of the data stored in the Word Bank (records). 6
The addition of new stimulus-response pairs may be programmed directly
into the Word Bank, but it may also be “taught” to a fixed behavior agent by
showing it the stimulus and guiding it through the response - like a tennis
coach taking a player's arm and guiding it through a particular strike motion. 7
As a formal example of what we call the guided pattern method in DBS,
consider providing the fixed behavior agent described in the previous section
with the new stimulus sequence red green and guiding it through the new
motion sequence strght, left, left, left, left , as shown graphically below:

6.2.1 N EW PATTERN FOR A FIXED BEHAVIOR AGENT

red green

This new motion pattern may be implemented by adding the following content
to the agent's Word Bank:

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

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

rec: red
prev:
next: green
prn: q 1

rec: green
prev: red
next: strght
prn: q 2

act: strght
prev: green
next: left
prn: q 3

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

act: left
prev: left
next: left
prn: q 5

act: left
prev: left
next: left
prn: q 6

act: left
prev: left
next:
prn: q 7

To automatically derive the new pattern by guiding the agent through the mo-
tion shown in 6.2.1, the “record player” system of an LA-act grammar must
be complemented by a co-designed “recorder” system of an LA-rec grammar
(for recognition). For this the agent must be extended from being able to rec-
ognize the stimuli to also being able to recognize the elements of the guided
responses.
The first step is a definition of lexical proplets, such as the following:

6.2.3 L EXICAL PROPLETS OF AN EXTENDED FIXED BEHAVIOR AGENT
⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

⎡
⎣

⎤
⎦

rec: red
prev:
next:
prn:

rec: green
prev:
next:
prn:

rec: blue
prev:
next:
prn:

act: strght
prev:
next:
prn:

act: left
prev:
next:
prn:

act: right
prev:
next:
prn:

6 An alternative model for controlling behavior is the goal stacks or goal trees in the framework of
Anderson's ACT-* theory (Corbett et al. 1988).