Psy 123_Lec 5

Not surprising but validated the technique it offers

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Unformatted text preview: ering checkerboard vs when they are not. Not surprising, but validated the technique. It offers more advantage over PET Time Functional Magnetic Resonance Imaging (fMRI)! Advantages of fMRI over PET! Higher spatial & temporal resolution! Noninvasive, and procedure can be repeated! Anatomical & functional scans can be collected together! More flexible experimental designs! So fMRI offered more spatial resolution (3 mm) and temporal resolution (b/c in PET must let half life expire, and many limitations on what you can have people doing). Since collecting a signal every 2 secs in the brain, allows more flexibility in experimental design. PET relies on tracer in the bloodstream, but fMRI uses a natural tracer, so not as invasive and can do it again and again. Also, fMRI allows a screen of the anatomy when you are already there Once developed, fMRI became the preferred neuro-imaging technique for cognitive neuroscientists. PET has a couple of advantages, one, that you can trace particular transmitters. But would prefer MRI if looking for a tumor (because better res. ) Physics of fMRI! “MRI is based on the detection of electromagnetic signals (radio frequency (RF) waves) which emanate from spinning hydrogen protons when they are excited by an RF pulse applied in the prese...
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