Chapter7 "CE N'EST PAS LOGIQUE" OR "YOU'VE GOT A POINT THERE"?

In this chapter Nisbett described how Westerners and Easterners differ in logical thinking. He said that Westerners tend to avoid contradiction by thinking logically while Easterners don't care about contradiction and try to find Middle Ways. He proved this in many experiments.

I was interested in the result of the test that studied the consumer choices of European Americans and people from Hong Kong. When the subjects were first asked to choose one of three computers, Americans and East Asians were about equally likely to choose the immediate one. However when they were asked to give reasons for their choice, American moved to preference for extreme objects and Asian participants moved to preference for the compromise objects. I felt this was very interesting because it shows obvious difference between them.

Well I was surprised when I read the part that he wrote "Asians tend to do much better in math and science than Americans". Is that true? His reasons for his idea were quite convincing but I can't believe this because he doesn't give use any evidence.