Sensory coding;BBS stuff

[From Bill Powers (940806.1100 MDT)]

Peter Cariani (940805.2205) --

I'm just expressing what I think and know (and what I know I think)
about auditory processes -- no argument intended. I have dabbled
fingertips in this subject, you are up to your elbows in it.

RE: adequate stimuli

And if one assumes that the coding is purely by rate-place, it is
difficult to explain why some electrically induced temporal patterns
give rise to particular sensations, while different patterns with the
same number of pulses give rise to none.

This certainly suggests that temporal coding MIGHT be important, but it
doesn't answer the question of the nature of the sensation-recognizer,
or the form that its output signal takes. It's possible that if the
inputs to the function are coded temporally in one way, the function
will compute one value, and if coded in a different way, a different
value, or zero. The "adequate stimulus" defines the requisite _input_ to
the function, but does not indicate how the resulting sensation is
encoded. The output signal may simply be a frequency that indicates the
degree to which the inputs are those that the function is designed to
recognize. There is no reason to suppose that the output signal, too
(i.e., the perception itself) must be temporally encoded just because
the inputs are.

This applies to all the experiments you mention.


"John" (no date or time stamp -- further identification lost when I
deleted the header materials before reading)

Thanks for the reference to the BBS article. I may submit a comment.
Feldman is trying very hard to come up with the PCT model. Actually, it
would be lovely if he would merge the lambda model into the PCT model
and take over the development for motor control systems. His depth of
acquaintance with phenomena in this area is impressive.
Best to all,

Bill P.