25 Brain & Behavior II Flashcards
Benefit of Neuroimaging?
NON-invasive
Patient still CONSCIOUS!
Name 4 types of neuroimaging
MRI - magneric resonance imaging
EEG - electroencephalogaphy
fMRI - functional MRI
TMS - transcranial magnetic stimulation
MoA of MRI
Magnetic field causes reverberations in H molecules
= allows computer to distinguish between TISSUE types
Benefit of MRIs?
SAFER than CT (no x-rays)
What is the OUTPUT of MRI
3D anatomical picture of STRUCTURES
Explain EEG
Electrodes to detect electrical currents in brain CORTEX only
EEG has good _____ resolution but poor _____ resolution
EEG has:
Good TEMPORAL resolution (real-time changes)
Poor SPATIAL resolution (cortex only)
How can SPATIAL resolution of EEG be improved
Using more electrodes
How is fMRI usually used?
In CONJUNCTION with MRI
= structural (MRI) AND functional (fMRI) information
What does fMRI detect?
Highly ACTIVE areas with fast ∆physiology
Areas with fast ∆physiology are CHARACTERISED by
High BF + O2
How is BLOOD flow detected in fMRI?
IRON in blood can be detectged by the fMRI magnetic field
How does TMS work
Magnetic pulses on scalp to create temporary TARGETED DYSFUNCTION in brain
Purpose of EVENT-related potentials?
AVERAGE NOISE using MANY trials
Where does NOISE come from
Contaminating signals from NON-interest brain areas
