In the late 1970s, a pair of US scientists, David Pogue and Michael A. Rutter, worked on a study that was widely heralded as the “biggest experiment in the history of mammals”.
They were looking at the behaviour of a bear cubs’ brain, and concluded that a particular region in the brain of the male bears would be the most vulnerable to injury.
They discovered that the area, which is called the ventral tegmental area (VTA), had a number of anatomical similarities to that of humans.
It was also very sensitive to stress, and that was due to the fact that the VTA is home to many different kinds of neurons, some of which fire in synchrony and other that fire in disjoint bursts.
The VTA also had the ability to control its own temperature and its own breathing, and was known to respond to a variety of different signals.
The team named this area the “bears brain” and the “central nervous system”.
A number of studies in the 1990s and 2000s also looked at the VBA and found that it is sensitive to changes in temperature and also to other physiological and psychological factors.
They were the first to show that the same areas that were very sensitive in humans would be even more sensitive in bears.
But this wasn’t the end of their research.
The next thing to do was to see if the same brain regions that were found in humans also showed up in bears, and if so, whether it was due solely to differences in temperature or because of differences in the way that the brain responds to other stressors.
The brain is extremely complex, and we don’t know the exact workings of it, but we know that it’s highly responsive to various environmental factors, and to those environmental factors we’ve been studying for the last few decades.
We know that stress causes a number, but what we don-t know is what the specific changes that happen in a bear brain are.
In 2005, Rutter and Pogue published a paper in the journal PLOS Biology describing how they were able to isolate certain parts of the VPA that are critical to the way the brain regulates temperature and breathing.
They then studied those parts of this region in bears and found the VAA to be the only part of the brain that was sensitive to different environmental stimuli.
And when they placed a bear in a room with a mouse, the researchers found that the stress hormones released by the mouse had an immediate effect on the VDA, and in turn, the VRA.
The stress hormones that the bear experienced in the laboratory, such as cortisol and oxytocin, had an effect on how the VFA responded.
In a study of 20 bears that were kept in an indoor environment with varying levels of CO 2 (a measure of CO2 levels) and in a similar environment without a mouse for four weeks, Roch et al found that both the VHA and the VCA were sensitive to CO 2 .
These findings prompted the team to start an ongoing study that looked at how the brain responded to various stressful events in the bears.
And as expected, the results were very different.
The most sensitive regions of the central nervous system are located in the ventromedial prefrontal cortex (VMPC) and the ventrolateral prefrontal cortex, which are the areas responsible for regulating emotions.
And the most sensitive parts of these regions were found to be in the VMA, the region of the ventricles that sits at the junction of the two hemispheres of the cerebral hemisphere.
And that’s when things got really interesting.
The study found that these regions are also critical to responding to other kinds of stressors that may occur during the life cycle of a female bear.
For instance, in an earlier study by Pogue et al. they found that during pregnancy, the hypothalamus, a part of that area, releases hormones called oxytocins.
And these hormones play a role in helping a mother-infant bond and in helping to keep the mother’s baby safe.
But they also affect how the mother feels during pregnancy.
And what they found was that during a stress event, the amygdala, the part of this brain region that’s involved in emotion regulation, releases a hormone called vasopressin.
This is a hormone that helps regulate heart rate, blood pressure and temperature.
When the hypothalamic area releases a stress hormone, it also releases vasopression, which has an effect similar to the stress hormone released by a bear’s brain.
The result of this is that when the mother-bear is in distress during pregnancy or early lactation, her amygdala releases an adrenaline-like response that can cause the mother to experience feelings of stress, such the feeling of being in danger, or of being afraid.
In other words, stress hormones affect the mother by stimulating the amygdala and vasopressor regions of her brain, so when a mother is in the midst of an emotional stress event she is