L64 PNP 200 Lecture Notes - Lecture 12: Neural Correlates Of Consciousness, Pulse Oximetry, Hemoglobin

• School: WUSTL
• Department: Philosophy-Neuroscience-Psychology
• Course: L64 PNP 200
• Professor: Povich

Document Summary

Look back at blood flow test from lecture 12. Blood flow in the brain is related to cognitive. Blood flow and fmri fmri measures levels of blood oxygenation, not blood flow. Deoxygenated hemoglobin disrupts magnetic fields, while oxygenated hemog. Levels of blood oxygenation provide an indirect measure of blood flow. Oxygen consumption is not proportional to blood supply (unlike glucose) Bold contrast is the contrast between oxygenated and deoxygenated blood. We want to know not just where cognitive activity is happening but how it is. Must answer the first question before we know how. Requires calibrating imaging data with data about neural activity. Neuroimaging allows us to identify which brain areas are active when subjects perf. Standardly studied through computational models behavior of populations. Can be studied through single/multi unit recordings moglobin does not. Indirect measure vs direct gnitive activity to an it is happening perform particular tasks ations of artificial neurons. Necessary first step in building neural network models.