Ainsley is participating in a study that aims to determine whether the occipital cortex becomes more active in response to moving versus stationary stimuli. when she arrives at the lab, she ingests a "tracer" and then enters the scanning machine. what type of brain imaging is most likely being conducted in this study?

Positron emission tomography (PET)

Explanation:

Positron emission tomography (PET) consists of the measurement of the physiological function by inspecting the flow of the blood, metabolic functions, radiolabelled drugs, and neurotransmitters. PET provides quantitative analyses making it possible to monitor relative changes as time passes, keeping control of the progress of a disease or how the person reacts to a stimulus. To do it, the person receives a low quantity of a radioactive tracer into his/her organism via injection.    

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."