[ACT-R-users] Model of writing - PS

[Bonnie John]

Oh, yeah, more history: when my serial approximation was submitted to a 
psychology journal, one of the reviewers called it "evil engineering" 
because it perpetuated the myth that typing could be approximated with a 
serial model even though videos of people typing clearly show that the 
fingers move in parallel. Of course, all models are approximations and 
why one is "evil" and one is, what, "angelic"???, I dunno.   ;-)
It got published in that "evil" journal, HCI.
Bonnie


Susan Chipman wrote:
>          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 
> <mailto:db30 at andrew.cmu.edu>> wrote:
>
>
>
>     --On Tuesday, August 24, 2010 1:18 PM -0400 Bonnie John
>     <bej at cs.cmu.edu <mailto: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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