What are the ways in which you can create images of the brain anatomy?
CAT Scan, MRI, X-Ray
What is the volume of an MRI?
1 3D volume
What resolution does an MRI have?
High Resolution (clear image) - 1 mm
In an MRI, how do you take the images?
Repeatedly take images over and over for good resolution and then building together the multiple images
What resolution does an fMRI have?
Low resolution (3mm)
In an fMRI, how do you take the images?
Multiple 3D volumes (repeatedly take images, don’t combine them)
What do you want your structural and functional imaging to do?
Match/Co-register each other (from functional imaging can determine what structure you are looking at)
A functional image is not what?
A picture of the brain - in reality it is a picture of something else
What is PET, fMRI looking at?
Oxygenated Blood
What is EEG looking at?
Electric Fields
What is MEG looking at?
Magnetic Fields
What is cognitive activity associated with?
Increased activity of neurons
What do neurons performing similar functions tend to do?
Cluster together - Functional Specialization
What does neural activity consume?
Oxygen
How do you compensate for increased consumption?
By pumping fresh blood into active region
What is PET measuring?
Blood Flow in a Region
What is fMRI measuring?
Blood oxygenation
