Depending on who's writing the episode, yeah, and it's a great concept that I felt was explored well. Other times, however, we have an episode where Tuvok talks at length about the training and conditioning he underwent to control his emotions, then in the very next episode, talk at length about how Vulcans are naturally emotionless and incapable of feeling emotion at all. This chronic lack of consistency in the writers' room is a big part of why Moore left the show to reboot BSG.