associative learning

[Wolfgang Schoppek]

> > In the meantime I have found out something about activation sources:
> > Typing "(activation-sources)" after firing a production that pops a
> > subgoal returns the chunks of the last subgoal although the goal stack
> > viewer tells me that the subgoal had already been popped. As far as I
> > can see in the source-spread items of the declarative memory viewer this
> > causes trouble in the spread of activation.
> > - Is this a bug? (I use the ACT-R 4.0 Environment for Allegro CL 3)
> > - If so, could it cause the sudden drop in the IAs?
>
> It would be a bug (which might conceivably cause the IA problem), but I
> cannot reproduce it using plain ACT-R 4.0.  I will take up the problem with
> our PC-master.
>

I have found another constraint for that error. It occurs only if the
subgoal is popped with failure, not if popped regularly.

-- Wolfgang