An excerpt:
Q: An experiment at McMaster University in Hamilton, virtually switched personalities between two populations of mice.
A: This was very exciting: two types of mice, one more curious, more exploratory, and the other one more shy. The researchers made them flora-free with a cocktail of antibiotics. Then they fed each group with the bacteria typical of the other type. The mice altered their behaviour in a way that flipped their roles—the timid grew bold, the bold more timid—and you could also see on a neurological level that a brain transmitter had been altered by this swap. In the same way, the depressed mice [made to swim] for their lives in a bucket of water don’t try very hard, but give them enhanced gut flora and they swim harder and longer and show fewer stress hormones in their blood. All this raises the question of how much we can change human behaviour with bacteria.
http://www.macleans.ca/society/health/the-interview-scientist-giulia-enders-on-the-guts-power/
Q: An experiment at McMaster University in Hamilton, virtually switched personalities between two populations of mice.
A: This was very exciting: two types of mice, one more curious, more exploratory, and the other one more shy. The researchers made them flora-free with a cocktail of antibiotics. Then they fed each group with the bacteria typical of the other type. The mice altered their behaviour in a way that flipped their roles—the timid grew bold, the bold more timid—and you could also see on a neurological level that a brain transmitter had been altered by this swap. In the same way, the depressed mice [made to swim] for their lives in a bucket of water don’t try very hard, but give them enhanced gut flora and they swim harder and longer and show fewer stress hormones in their blood. All this raises the question of how much we can change human behaviour with bacteria.
http://www.macleans.ca/society/health/the-interview-scientist-giulia-enders-on-the-guts-power/