There is a certain conjecture that Vulcans have to control their emotions, because down inside, they're all homicidal maniacs. A Vulcan raised among Humans would not be taught those controls, certainly not the same way.
Still, it might be interesting to see how much of the Vulcan daily non-emotion is attributable to Vulcan culture, and how much is biological.
The Human raised Vulcan might come to realize that they are actually incapable of full Human emotional expression. They can smile at the appropriate times, but not really feel happiness. Or hate, fear, passion (outside of Pon Farr), and love. That when it comes right down to it, their emotional scale is permanently set to "low."