Also, why anthropomorphize the computer? And why are we "summarizing" instead of instructing the computer? The question asked for a declarative solution and then is surprised that the children gave declarative answers. [edit: I misread what was being said in that portion of the paper and that portion of has been replaced by this bit in square brackets]
The experiment seems extremely sloppy. It can't possibly show what it purports to show, there's way too much in the design of the study that could have biased the results, the sample sizes tiny, the task unclear, and the quantitative analysis subjective.
What list? Perhaps I'm just missing it or there's another link I haven't seen but they don't seem to mention having taught the kids anything--especially anything technical--before the Pac-Man study.