Alternate Descriptions

[From Fred Nickols (980930.1540)]

Bruce Abbott (980929.0820 EST)

I thought I stated it plainly: the arm's movement follows (more or less,
depending on the magnitude of disturbances acting on the arm and the quality
of control) the person's intended arm movement (time-varying reference).
What's obscure about that?

I don't intend mixing in this exchange between Bruce A and Bill P but I
do want to ask a question.

        When you say "the arm's movement follows...the person's intended
       arm movement..." that sounds to me a lot like control at the
        program execution level (i.e., move your arm in this way). The
        end state is left as a determinate outcome of successful program
        execution.

        I suppose that is viable but I would have thought a PCT-based
        description might have indicated that the arm moves, not in
        accordance with some movement program being executed but, rather,
        in whatever ways are necessary to arrive at the intended position.
        The movement path followed would reflect the disturbances/obstacles,
        what have you.

Is there something I don't understand here?

Regards,

Fred Nickols
Distance Consulting
http://home.att.net/~nickols/distance.htm
nickols@worldnet.att.net
(609) 490-0095

[From Bill Powers (980930.1426 MDT)]

Fred Nickols (980930.1540)--

       I suppose that is viable but I would have thought a PCT-based
       description might have indicated that the arm moves, not in
       accordance with some movement program being executed but, rather,
       in whatever ways are necessary to arrive at the intended position.
       The movement path followed would reflect the disturbances/obstacles,
       what have you.

Is there something I don't understand here?

No.

Best,

Bill P.