fMRI 0.0 / 5 ? PsychologyNeuroscienceUniversityNone Created by: JessToLetYouKnowCreated on: 01-06-16 21:33 What does BOLD fMRI stand for? Blood-Oxygen-Level Dependent 1 of 15 Why is blood "magnetic"? Based on whether or not hemoglobin in red blood cells is carrying oxygen 2 of 15 Oxyhemoglobin is .. Diamagnetic (not magnetic) 3 of 15 What does oxyhemoglobin do to signal? Increases signal a bit and makes image brighter 4 of 15 Deoxyhemoglobin is... Paramagnetic (magnetic) 5 of 15 What does deoxyhemoglobin do to signal? Decreases it a lot and makes image darker 6 of 15 What is the total of deoxy and oxyhemoglobin called? Total hemoglobin or cerebral blood volume 7 of 15 Deoxyhemoglobin appears when the brain extracts .... for metabolism Oxygen 8 of 15 What would we expect to happen? Deoxyhemoglobin would increase as oxygen is used up 9 of 15 Why does this not happen? Because flow increases so much 10 of 15 Therefore ..... of hemoglobin leads to increase in fMRI signal Washing away 11 of 15 What increases in specific region following presentation of stimulus? Cerebral blood flow 12 of 15 This is stronger than what? Greater than any oxygen consumption 13 of 15 However what is "a dip" that occurs at the start of the process? Increase in deoxyhemoglobin 14 of 15 What does this cause? Temporary dip in fMRI signal 15 of 15
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