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59244
Neuroimaging
Description
Masters Mind Body Brain Mind Map on Neuroimaging, created by Amberlee Green on 27/04/2013.
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mind body brain
mind body brain
masters
Mind Map by
Amberlee Green
, updated more than 1 year ago
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Created by
Amberlee Green
over 11 years ago
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Resource summary
Neuroimaging
Structural Imaging
What the brain looks like
Dissection
When brain is out of skull
Examine for gross lesions e.g. physical damage/infection/stroke
Thin slices look at cell damage eg. tangles in alzeimehers
CT Scans
Computorized Tomography
Thin slice xrays that can be assembled into 3D data structures to use clinically
different tissue absorbs radiation to dif. extents e.g.brain, skull, ventricles
MRI Scans
Magnetic Resonance Imaging
Head placed in strong magnetic field to align protons, radio frequency knocks them out of allignment
It measures radiowaves emitted as it re-aligns - gives high resolution pic of braim
diffrenciates grey from white matter
DTI Scans
Diffusion Tensor Imaging
way of analysing MRI data - looks at direction of diffusion and the nerve fibre tracts in brain (white matter
Functional Imaging
Looks at brain in action/what it is doing
PET Scans
position emission tomography
radioactive tracers in bloodstream then measure positiron particles emitted
worse resolution that MRI but has advantages
FMRI Scans
Functional MRI
Same techniques as MRI, measures BOLD (brain oxygen level dependant) response; a distortion due to 'deoxyhaemoglobin'
its sensitive to blood flow & oxygenation so assumed to correlate with neural activity
It maps out what bits do what and tests theories e.g. individual differences
MRI Spectroscopy
Magnetic Resonance Imagery
Analysic techniques measure relative concentrations of diff biological chemicals e.g. neurotransmitters
EEG
Measures small voltage on scalp due to brain 'generators'
Net/cap electrodes on scalp
good at measuring timing but not location
Electro encephalt graphy
ERPs
Event related potential
Evoked electrical pattern creates temporary precise patterns of voltage (can be removed - not phase locked)
Very variable and noisy
MEG
Magnetoencephalography
Measures magenetic field around head due to the electrical fields in the brain
Good at timing and localising
No fiddily electrodes
Better at things that EEG and vice versa
Other Types
Brain Stimulation
very quick/strong magnetic field induces brain current which intereferes or stimulates an area; sing pulse Transcranial magnetic stimulation (TMS)
Continous TMS
Interferes for longer and has greater effect; manipulates timing relative to sensory stimulous
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