Luckily it was good news, as mom showed the boys her ultrasound picture. Some mothers complain of fuzzy-headedness, and certain data even show minor brain shrinkage during pregnancy. Or is the sole purpose just to see if you can do it? And if you're concerned about being able to find those reminders, place Post-its in a prominent place. The researchers designed experiments where a rat in an environment learns to associate, say, a triangle or a set of wavy lines with a food reward. Because the maternal brain emerges gradually, the construction site it becomes in the interim can cause some problems for its owner. Caution and Courage If Liz devoted all her attention to her infant, however, both mother and child would perish.
Animals may in fact be engaging in maternal behavior simply because it feels good. And work by Amy Au and Tommy Bilinski, then working in our lab, has begun to identify the rats' strengthened ability to deduce the meanings of symbols. As the pups continue to suckle, the mother's core body temperature rises. The infant creates a rich environment that stimulates the mother, pushing her brain into a higher gear. Here's how to deal. The hormones of pregnancy appear to construct a neural shield that protects a mother from damage that otherwise might compromise a rat's ability to care for its young. The mothers with the biggest increase in gray matter volume also reported the more positive perception of their babies. Another clear example is the long-tailed duck, in which the males and females have dark heads. Soon enough the mother begins to feel uncomfortable and moves away. But the phenomenon fades with experience. Research suggests that motherhood enhances certain types of cognition, improves resistance to stress and sharpens some kinds of memory. Check the Vent Ducks' reproductive organs are inside their bodies, so telling the boys apart from the girls takes a little more expertise if you're attempting to make a distinction based on the plumbing. But the rat's body imposes a natural limit. The human body is a beautiful machine. Science may explain the maternal brain, but the real marvel—especially when you are gently tucking the blanket around your baby's chin as she sleeps in your arms—might simply be the beauty of a new child's existence. Size Counts If you're unable to distinguish any differences between two or more ducks, take a look at their sizes. No, that'd be silly, right? Behavioral neuroscientist Kelly Lambert of Randolph-Macon College and her colleagues have collected other evidence of sharp-witted mothers. Producing an offspring requires a mother to jeopardize her own health, safety and survival, so her behavioral system kicks in to protect and defend that investment. Later, desiring another burst of opiates, the rat comes back to the nest, the pups reattach and the cycle begins again. Before she had her first child, Liz had avoided the smells of children, even those to whom she was related. Many experts attribute the sluggishness to the upheaval of hormones that inevitably occurs after childbirth. The growth the scientists saw was particularly visible in the midbrain, parietal lobes and prefrontal cortex—all areas involved in infant care. The researchers designed experiments where a rat in an environment learns to associate, say, a triangle or a set of wavy lines with a food reward. Researchers there have shown significant alterations in the architecture of dendrites in the medial nucleus of the amygdala, which in addition to its important role in the olfactory system also controls defensiveness and avoidance behavior. By the time we finished writing this article, she had given birth to a healthy baby girl.
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