make them more confident or anxious in handling her baby and trains the stress chemicals and herb loudermilk. hierarchical differences like income equality are sometimes associated with postpartum depression. access to resources like food is another big difference and another monkey lab in new york state scientists used a device can call the variable -- take test our their access to resources and maternal behavior. this contraption looks a little bit like a bevers service card on an airplane but it has a bunch of holes on the side for to reach their hands and feel for food. this piece of hailes rationalized equipment did look like it might be handy to have around the house like goldfish crackers and things like that. anyway in scientists experiment it's easy to find and sometimes it's hard to find. all the moms and experience get enough food to eat back in the ones with the hard to find food are mothers that -- but some of the moms don't know whether they will get one and among these moms want to experience chronically uncertain conditions and never knew what kind of food they would be getti