Fоr mоst аddictive drugs, оnly а smаll proportion of those individual who use each drug will develop characteristics of addiction. The variability in the degree to which individuals develop addiction-like behaviors is referred to as “individual differences”. Some examples of individual differences in the development of addiction-related behaviors or brain responses were discussed in lecture, including examples in humans and non-human animals. Describe examples of individual differences in addiction-related behaviors, including one from humans and and one from non-human animals. (6 points) What brain region(s) or brain mechanisms may underlie these differences in behavior between subsets of individuals? (4 points) What is the evidence for the role of this brain region (or these regions) in individual differences in addiction? Please be specific about the brain measurements or manipulations used and the associated behavioral outcomes, and include evidence from both humans and non-human animals. (10 points)