Kinesiology 3371A/B Lecture Notes - Lecture 3: Claustrophobia, Magnetic Resonance Imaging, Traumatic Brain Injury
1 Mar 2018
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3: neuroimaging (cid:862)(cid:449)e o(cid:374)ly use 7% of our (cid:271)rai(cid:374)s(cid:863) false, although in neuroimaging we may see only small portions lit up the rest is acting as background support. Various techniques used to directly /indirectly image the structure and/or function of the brain. Assumptions (assuming that what were measuring is an accurate representation of that) Time consuming (eeg takes 2 hours, mri 1-2 hours) Functional mris act to see blood flow in the brain, showing areas that are active while the patient is talking or thinking about certain tasks. Increased neural activity in the brain increased blood flow influx of oxygenated blood creates deoxygenated blood (activity) The fmri looks at the ratio of deoxygenated to oxygenated blood measured by the bold signal. Main advantage: high spatial resolution, activity can be pinpointed to 1-2mm. Main disadvantage: low temporal resolution, can measure where but not when (the process takes 1-2 seconds; a lag is inherent to mri data)
