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Biopsychology - 4/2

by: Sierra Wollen

Biopsychology - 4/2

Sierra Wollen


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About this Document

Lecture notes from 4/2. Main ideas: spatial, temporal, and causal imaging methodology.
Psychology, biopsychology, biopsych, Biology, neuroscience, neurology, UW, graham, MRI, imaging
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This 2 page Reader was uploaded by Sierra Wollen on Wednesday April 16, 2014. The Reader belongs to a course at University of Washington taught by a professor in Fall. Since its upload, it has received 94 views.


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Date Created: 04/16/14
PSYCH 202 42 Brain Imaging Methods Imaging Specialties a WHERE in brain a WHEN in brain a Does this in brain CAUSE behavior Where imaging techniques Where technique limits Relies on localization of function Positron Emission Tomography uses tomography and injections of radioactive substances used by brain in order to view functioning 0 Measures blood ow if brain area being used blood will ow to that area functional Magnetic Resonance Imaging detects changes in blood ow and identi es brain regions that are active during task 0 can show how networks in brain interact Don t measure neural activity just blood M take image every 2 seconds Correlational not causational When imaging techniques Neurons send electrical signals Different tasks produce changes in electmagnetic elds of neurons 2 ElectroEncephalography neurons generate small electric elds measure activity on surface 2 MagnetoEncephalography measure magnetic elds of neurons When technique limits M only surface activity Signals Weak No causal inference Imaging limits Trade off btwn temporal and special res Data dif cult to interpret Correlational only Causal techniques 1 a Brain damage impairs speci c behaviors b What can patients do not do beforeafter damage c Limits no 2 lesions in same area consequences affect behavior 2 2 Transcranial Magnetic Stimulation applies magnetic elds to stimulate cortical neurons to identify discrete brain areas that activate during behavior Used on healthy people Create reversible virtual lesions Interferes w brain s electrical signals Helps prove localization of function Limits locality assumption no network effects a Optogenetics manipulate activity of subsets of neurons high spatial and temporal res b Limits subjects aren t human 999


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