PSYC20006 Lecture Notes - Lecture 4: Fusiform Gyrus, Voxel, Null Hypothesis
23 Aug 2018
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Document Summary
Basic principles of fmri: way of imaging the activity of the brain, used to be called nmri (nuclear magnetic resonance imaging, wasn"t user friendly enough, changed to fmri fmri vs. mri fmri, mri: I. e. shows you where the skull is, where white matter is etc. Images of mri vs. fmri: mri shows structure fmri usually shows radioactive elements superimposed on a mri image. If the resonance frequency of the proton matches the rf, the proton absorbs the energy and. If different protons are in different magnetic fields, their precession frequencies will be different. Summary of process: we excited the brain with an rf pulse, we measured the resultant rf pulse emitted by the brain, we only excited one slice of the brain, therefore we know the z-coordinate of all the resultant. Rf signals: we then briefly varied the magnetic field in the x-direction, so that the phase of the precessions varied in the x-direction.
