Interesting methodology and findings. Emphasis added.

[…]Recent research, though, suggests that the most important variable is not the sex of the person doing the talking, but that of the person being spoken to. According to a paper published Sunday in the online edition of the Journal of Language and Social Psychology, both men and women are more likely to interrupt and to use dependent clauses when speaking with a woman than with a man. Adrienne Hancock, a researcher at the Department of Speech and Hearing Sciences at George Washington University, and Benjamin Rubin, a Master’s student, recruited 20 male and 20 female volunteers and instructed them to engage in two short conversations, one with a man and one with a woman.[…]

In contrast with previous research, Hancock and Rubin didn’t find any significant differences in the way men and women spokebut they did find that having male or female conversation partners elicited different results. “When speaking with a female, participants interrupted more and used more dependent clauses than when speaking with a male,” they wrote. Over the course of each three-minute conversation, women, on average, interrupted men just once, but interrupted other women 2.8 times. Men interrupted their male conversation partner twice, on average, and interrupted the woman 2.6 times.

From newrepublic.

[#quickhits]Gender language differences: women interrupted more (research)