1) As discussed in the lecture, there are two broad categories of brain imaging.

1) As discussed in the lecture, there are two broad categories of brain imaging. Name and describe these two categories (I am not asking for the names of the specific types of brain scans (e.g., MRIs), but the names the categories into which the various types of scans fit).  
2)  The ________________ is used to detect seizures and played an important role in discovery of  rapid eye movement (REM).  As discussed in the lecture, a major limitation of this technology in basic research on the brain is________________________________________ 3)  As seen in the video shown in the lecture this modern brain stimulation procedure can be used to interfere with movement and speech in healthy individuals as a means of mapping brain functions and is used in the treatment of depression.  What is this method of brain stimulation called? 4)  This brain imaging technology involves injecting short-lived radio-active tracers into the bloodstream of individuals to reveal the brain activity. What is scan called?  An assortment of examples of this type scan was shown in the lecture slides. How were the varying levels of activity in the  the brain indicated on the scans?

Please watch the video answer the questions based on the video
https://www.youtube.com/watch?v=Gdt7-dXzX6o