Reversed in "Past Imperfect," where Myka is the emotional, impulsive one while Pete is the methodical, logical one. Justified, as in this case Myka is investigating something personal, and Pete realizes he needs to pick up the slack.
Myka: Pete, what are you doing?
Pete: Well, I'm thinking like Myka. When something doesn't make sense, Myka tries to make sense of it. But not right now, because she's too emotional, which is where Pete usually is, emotional. Then I thought hey, while you're being me, I may as well be you.