PSY 3061 Lecture Notes - Lecture 10: Neuroimaging, Lesion, Lamellar Corpuscle
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[functional mri (fmri): because it is blood-dependent, the bold response fluctuates pretty slowly, usually, it takes several seconds for it to return to baseline, up (chart) more oxygenated blood, down (chart) less oxygenated blood. [neuroimaging requires image processing: paired image subtraction, to study how the brain activates the task , one must subtract how the brain activates during a baseline state . [pet, fmri, what are they missing?: neurons communicate with one another using electrochemical signals, pet and fmri measure metabolism, not neural conduction or electrophysiology they are indirect measures of neural activity, measuring after effect/echo of neural activity. [multi-modal imaging: record things on a tight time scale shorter than a millisecond, measure things as they oscillate or change, rate at which action potential is fired, using eeg. [how scientists judge the quality of a brain measure: non-invasive brain methods still aren"t as good as invasive methods, best spatial resolution neuron and -4 milliseconds .
