Who talks more: Men or women?

Catherine Griffin, "Why Women Talk More Than Men: Language Protein Uncovered", Science World Report 2/20/2013.

You know all the times that men complain about women talking too much? Apparently there's a biological explanation for the reason why women are chattier than men. Scientists have discovered that women possess higher levels of a "language protein" in their brains, which could explain why females are so talkative.

Previous research has shown that women talk almost three times as much as men. In fact, an average woman notches up 20,000 words in a day, which is about 13,000 more than the average man. 

In addition, women generally speak more quickly and devote more brainpower to speaking. Yet before now, researchers haven't been able to biologically explain why this is the case.

Eun Kyung Kim, "Chatty Cathy, listen up: New study reveals why women talk more than men", Today Show 2/21/2013:

Women have a gift for gab, and now they can silence their critics with science. 

New research indicates there’s a biological reason why women talk so much more than men: 20,000 words a day spoken by the average woman, according to one study, versus about 7,000 words a day for the average man. 

Women’s brains have higher levels of a “language protein” called FOXP2, according to a study conducted by researchers at the University of Maryland School of Medicine.

The stimulus for these little nuggets of nonsense was J. Michael Bowers, Miguel Perez-Pouchoulen, N. Shalon Edwards,3 and Margaret M. McCarthy, "Foxp2 Mediates Sex Differences in Ultrasonic Vocalization by Rat Pups and Directs Order of Maternal Retrieval",  The Journal of Neuroscience, February 20, 2013. More on Bowers et al. later — this morning, I'll just take up the "previous research has shown that women talk almost three times as much as men" business.

Summarizing:

1. There has never been any "study" showing that "women talk almost three times as much as men", although this non-existent "research" has been cited by dozens of science writers, relationship counselors, celebrity preachers, and other people in the habit of claiming non-existent authoritative support for their personal impressions;
   
   
2. Many real-world studies of gender differences in language use indicate that men and women are about equally talkative. One large, relatively recent study (M.R. Mehl et al., "Are Women Really More Talkative Than Men?", Science, 317(5834) p. 82 July 5, 2007) found essentially equal counts of about 16,000 words per day in six samples of university students in the U.S. and Mexico.


3. The University of Maryland study did not perform any word counts whatever, but rather looked at the effects of FOXP2 gene expression on the vocalizations of baby rats, and measured Foxp2 protein levels in the brains of a few dead human children.

Source: http://languagelog.ldc.upenn.edu/nll/?p=4488