[ACT-R-users] Model of writing

[Susan Chipman]

         I thought I might remind people that typing was one of the first
behaviors modeled by the PDP folks.  They had data showing that multiple
typing actions went on in parallel -- that is, the actions of future fingers
were beginning before the current action was completed.  Don't know if these
ACT-R models are dealing with that.

Susan Chipman

On Tue, Aug 24, 2010 at 3:29 PM, <db30 at andrew.cmu.edu> wrote:

>
>
> --On Tuesday, August 24, 2010 1:18 PM -0400 Bonnie John <bej at cs.cmu.edu>
> wrote:
>
>  We have a lower-level model of typing implemented in ACT-R tht is
>> "under-the-hood" of CogTool. It is a mixture of my ages-old PhD thesis
>> and what we cold do in ACT-R without changing the entire structure of
>> its hand and fingers. So it still has remnants of ACT-R's typing
>> assumptions, like the the hand always goes back to the home-row between
>> each keystroke, but we have relaxed some of the other assumptions in the
>> standard ACT-R typing model and so have sped it up to being about a 40
>> wpm typist instead of the 20 wpm typist it is in the general release.
>>
>>
> One note to make about that is the only assumptions about fingers returning
> to the home-row are with the use of the press-key and peck-recoil actions.
> If one programs the specific finger movements with peck and punch actions
> then the fingers will stay at the key that was hit.  If you're not already
> taking advantage of that you may be able to speed up your CogTool typist
> even further.  Of course the complication is that to do that you would
> also have to have something that computes the necessary geometry from the
> current finger position to the target key instead of just the home-row to
> target key geometries which are available from press-key.
>
> As a simple demonstration of that, attached is a simple model which types
> two keys in sequence using the same finger twice.  The first time using
> two press-key actions and the second using explicit peck actions.  The
> inter-key time for the second pair is less than for the first and that
> should be true for all valid one-finger pairs.
>
> Dan
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