Running the risk of an Outside Joke here, but I thought the art style in Caillou was detailed enough to distinguish Charlie Brown's do (blond hair with a buzz cut) from actual baldness.
How is Caillou slower paced than SpongeBob? Never watched the show(Caillou) but looked it up on Netflix, and there are five stories per episode, while SpongeBob has two, so logically SpongeBob should be slower paced.
Caillou has a very gentle, slow, slice-of-life pace. SpongeBob has a wacky, action-packed cartoony pace. While there are less shorts in SpongeBob, a LOT more happens in the shorts. If that doesn't answer your question, just try watching an episode and you'll see what I mean. (Also, please, please don't be offended by me correcting the punctuation in your question. It's the only change I made, and it was just because I have a light case of OCD and such things really bother me.)
Thanks for the explanation. Just thought those psychologists might have faked the test for the creators of Caillou