IGN: Note: Full spoilers for the episode follow.
After ingesting the brains of a kleptomaniac, a passionate artist, and a sociopath, Liv had a less dramatic meal in tonight's episode. Sammy Wong's fearful and anxious traits transferred over and though they put Liv on edge, they didn't take control as overtly as the other brains have. We only saw Liv eat few bites so maybe the smaller portion contributed to a more subtle personality shift (excellently played by Rose McIver, as usual). Of course, she did gain major kung fu skills.