(laughter) >> and so in the mondaytaken, the mature ones will come along and meet they will mate andwill go on their way. looking for more action, she is going to have the baby. but in the prairie, they meet, they mate, and now they're bonned forever. and what that means is that the male stays with the females, guards the nest, helps to rear the young. they like to be together. if they're separated they get depressed. and in general, if the different in the brain between the prairie vole and the mondaytaken. >> the prairie vole is a christian. (laughter) (applause) >> it turns out that they're not christian t turns out that in one very specific part of the reinforcement system of the brain, that the prairie vole has a different organization from the mondaytaken vole and if you change that organization, they behave like the mondaytaken vole. >> and how do you do that? dow cut it out? do you go in there and chop out bits of the brain. >> you can actually do it biochemically. you can interrupt the pathways or you can present the receptors. >> so you are saying that oxy tocin, the oxytoc