When I was in college one of the candidates for some open position in the engineering school gave an open talk which I attended. He had this whole thing where he researched the right/left brain tendencies of engineering students. He actually had two axis on his pictures but I don't recall what the other axis was so lets keep to the the left/right (logical/creative) axis. He said most students entering engineering were more left brained. He also said retesting people exiting engineering has shifted. Not that the right brains dropped out, but that the same students tested more to the left after an engineering education.

It wasn't clear if that was a shift in thinking or just improving ones skills at a particular way of thinking. In other words, no evidence of any loss just a shift in score on a right/left test. The other notable thing he said is that the right brained people who complete an engineering degree were rather likely to spend some time working in the field and then just change to something completely different.

I remember this well because I tested as a dominant right-brain thinker and have always had this odd feeling that I might want to just stop and do something completely different. Fortunately I've been able to find ways to use creativity in engineering :-)