Really like the second article.
Quote:
The researchers believe their experiment demonstrates that the monkeys use a precursor of what investigators of human cognition refer to as declarative knowledge -- knowledge acquired rapidly and logically. This is in contrast to procedural knowledge, which is inflexible and acquired slowly through repetitive training on a particular problem.
"Although the subjects of this study lack the ability to declare their knowledge verbally, the breadth of their serial expertise suggests that they have all of the other features of human declarative knowledge," Professor Terrace said.
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Much more scientifically stated, but still not anywhere near logical process. (precursor to, yes; but not there.)
Supposedly it is due to marginal Cajal-Retzius cells. Would be interesting to see a genetically engineered chimp with human levels of Cajal-Retzius cells.