Women really do talk more than men (13,000 words a day more to be precise) Previously been claimed that woman speak 20,000 words a day Tell him - at length, of course - it is all because of the Foxp2 protein. It has been claimed previously that women speak about 20,000 words a day - some 13,000 more than the average man. It has been claimed that women speak about 20,000 words a day - 13,000 more than the average man - and scientists say a higher amount of the Foxp2 protein is the reason women are more chatty But now scientists have found the key to explaining why women are the more talkative sex. A study just published suggests that higher levels of the protein are found in the female brain. US researchers found that those with more Foxp2, known as the "language protein," in their brains were the chattier. Among humans that was women, but in rats it was the males. The researchers set out to determine what might make male rats more vocal than their female cage mates. They separated four-day-old pups from their mothers and counted the number of times they cried out. Both male and female pups emitted hundreds of cries, but the males called out twice as often. Researchers found the so-called 'language protein' that makes women more talkative also causes male rats to be more vocal than their female cage mates Tests on the parts of the brain known to be involved in vocal calls showed the male pups to have up to twice as much Foxp2 protein as the females. The researchers then ramped up its production in the brains of female pups and reduced it in males. This led to the female rats crying out more often and their mothers showing more interest to them. Next, the University of Maryland researchers tested samples from ten boys and girls aged between three and five. This showed the girls to have 30 per cent more of the Foxp2 protein than the boys, in a brain area key to language in humans. Researcher Margaret McCarthy said: "Based on our observations, we postulate higher levels of Foxp2 in girls and higher levels of Foxp2 in male rats is an indication that Foxp2 protein levels are associated with the more communicative sex." They produce their first words and sentences earlier, have larger vocabularies and use a greater variety of sentence types than boys of the same age.