which is a bouba, and which is a kiki?

[kikitheamazing]

I was looking up this "angular gyrus" thing online because it's on my study guide for psych (and not in my book) and I stumbled across this page from the Scientific American:

http://www.sciam.com/article.cfm?articleID=0003014B-9D06-1E8F-8EA5809EC5880000&pageNumber=5&catID=2

LOL. What? A kiki?