Psy 123_Lec 5

Mri has been around for as long as pet scanning and

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Unformatted text preview: functioning of the anatomy. MRI has been around for as long as PET scanning and takes advantage of the magnetic properties of the body. The basic difference between fMRI and MRI is MRI is anatomical view (so only see differences in the tissue, high res. and only need to take one picture) whereas fMRI the image has a lower resolution, but it is able to pick up the deoxygenated hemoglobin has a different property than oxygenated hemoglobin. So it takes advantage of the relative ratio of the these 2.. Thus the idea is increase in metabolism = increase in ratio = activation of that brain area. Noisy, so also must avg. images together. … fMRI Blood Oxygenation Level Dependent: (BOLD) signal indirect measure of neural activity Whole parts of the brain are active all the time. ↑ neural activity ↑ blood oxygen ↑ fMRI signal! Functional Magnetic Resonance Imaging (fMRI)! Flickering Checkerboard OFF (60 s) - ON (60 s) -OFF (60 s) - ON (60 s) - OFF (60 s) The first BOLD fMRI functional mapping of the brain! Kwong et al., 1992! Developed in the late 80s and 90s, and used flickering checkerboard in order to prove validity of the technique. In the picture, can see visual lobe is activated when looking at the flick...
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This note was uploaded on 01/18/2014 for the course PSY 123 taught by Professor Staff during the Fall '11 term at UCSB.

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