terry.stewart
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That's a very good point, CounterBlunder, and I should have highlighted that as well. It is definitely fairly common for cognitive science researchers to never work with or make use of ACT-R. It's a sub-community within the cognitive science community. The research program has continued past the 90's, and there's probably around 100 or so researchers actively using it on a regular basis, but the cognitive science community is much larger than that, so your experience is pretty common.
As for whether ACT-R is "actually amazing and people have been silly to drop it", well, I definitely don't think that everyone should be making use of it, but I do think more people... (read 590 more words →)
Hi Vanessa, hmm, very good question. One possibility is to point you at the ACT-R reference manual http://act-r.psy.cmu.edu/actr7/reference-manual.pdf but that's a ginormous document that also spends lots of time just talking about implementation details, because the reference ACT-R implementation is in Lisp (yes, ACT-R has been around that long!)
So, another option would be this older paper of mine, where I attempted to rewrite ACT-R in Python, and so the paper goes through the math that had to be reimplemented. http://act-r.psy.cmu.edu/wordpress/wp-content/uploads/2012/12/641stewartPaper.pdf
Yes, that Tenison paper is a great example of arithmetic modelling in ACT-R, and especially connecting it to the modern fMRI approach for validation! For an example of the other sorts of math modelling that's more psychology-experiment-based, this paper gives some of the low-level detail about how such a model would work, and maps it onto human errors:
- "Toward a Dynamic Model of Early Algebra Acquisition" https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.53.5754&rep=rep1&type=pdf
(that work was expanded on a few times, and led to things like "Instructional experiments with ACT-R “SimStudents”" http://act-r.psy.cmu.edu/?post_type=publications&p=13890 where they made a bunch of simulated students and ran them through different teaching regimes)
As for other cool tasks, the stuff about playing some simple... (read more)
That sounds right to me. It gives what types of information are processed in each area, and it gives a very explicit statement about exactly what processing each module performs.
So I look at ACT-R as sort of a minimal set of modules, where if I could figure out how to get neurons to implement the calculations ACT-R specifies in those modules (or something close to them), then I'd have a neural system that could do a very wide variety of psychology-experiment-type-tasks. As far as current progress goes, I'd say we have a pretty decent way to get neurons to implement the core Production system, and the Buffers surrounding it, but much less of a clear story for the other modules.
As someone who can maybe call themselves an ACT-R expert, I think the main thing I'd say about the intentional module being "not identified" is that we don't have any fMRI data showing activity in any particular part of the brain being correlated to the use of the intentional module in various models. For all of the other parts that have brain areas identified, there's pretty decent data showing that correlation with activity in particular brain areas. And also, for each of those other areas there's pretty good arguments that those brain areas have something to do with tasks that involve those modules (brain damage studies, usually).
It's worth noting that there's no... (read more)
Hello everyone, I'm a long-time lurker here, but this is my first time commenting. I'm a researcher at the National Research Council of Canada, and a big part of my research has been about taking ACT-R and figuring out how it could be implemented in the brain: http://terrystewart.ca/
I very much agree with the summary in the main post here. ACT-R is the best current model if you are trying to match human experimental data, including things like accuracy and reaction times. And it's been applied to a much wider variety of tasks than any other competing theory. It's definitely missing lots and lots of things, but it also seems to be getting... (read more)
I agree that there isn't an overarching theory at the level of specificity of ACT-R that covers all the different aspects of the mind that cognitive science researchers wish it would cover. And so yes, I can see cognitive scientists saying that there is no such theory, or (more accurately) saying that even though ACT-R is the best-validated one, it's not validated on the particular types of tasks that they're interested in, so therefore they can ignore it.
However, I do think that there's enough of a consensus about some aspects of ACT-R (and other theories) that there are some broader generalizations that all cognitive scientists should be aware of. That's the... (read more)