Adams (1971)

[Avery.Andrews 930129.1700]

I started looking into Adams 1971, & it looks like it will be a real
motherlode for the devils bibliography. Exhibit 1:

"There is a reference that specifies the desired value for the system,
and the output of the system is fed back and compared to the reference
for error-detection, and, if necessary, corrected. The automatic
home furnace is a common example. The thermostat setting is the
desired value, and the heat output of the furnace is fed back and
compared against this reference" (Adams, J.A. `Closed Loop Theory
of Motor Learning', JMN,m3:11-150; p. 116

Here the blunder is that what the thermostat is measuring is the
actual output of the furnace, as opposed to the result of the
furnace output & all other influences on the air temperature in
the immediate vicinity of the thermometer. This mistake is probably
due to the typical Wiener-style and chemical engineering diagrams
of feedback systems (like the ones at the beginnin of Houk and Rymer
1981), where you have a box labelled `controlled system' with the
comparator, effectors, etc. outside of this box (maybe this is where
Kugler, Turvey et.al. get their strange ideas about control theory
from).

This blunder cross-fertilizes with another, the apparently classic
distinction between exteroception and proprioception, which figures
in a quote on the next page:

"For James, feedback acts as stimuli, and has no more status than an
  exteroreceptive stimulus which starts the sequence, like a light on
  a display."

Of course, James was just talking about response-chaining, but he seems
to have been closer to the right idea nonetheless.

So maybe a point to emphasize when talking to psychologists is that in
PCT there is no `proprioception' or `exteroception', but just
`perception' (this actually is rather Einsteinian - maybe I'm getting
the point of what Martin was saying a few days ago). This point can
be enhanced by observing that Schmidt (1982, 1988) discussing some
problems with these notions of perception, cites with approval a
proposal to introduce a third, blended term, `exproprioception' (for
`movements of our body in relation to the environment').

Avery.Andrews@anu.edu.au