Lecture 3 - Neuroimaging - Quiz 1/2 Flashcards
Which neuroimaging method is a form of structural brain imaging?
Magnetic resonance imaging (MRI)
Which neuroimaging method is the best for imaging the vascular system of the brain?
Helical CT angiogram
Which neuroimaging method provides the most information about fiber tracts in the brain?
Diffuse tensor imaging (DTI)
Which neuroimaging methods use radioactive materials?
Single photon emission computed tomography (SPECT), positron emission tomography (PET)
What does computed tomography (CT) use to image brain structures?
X-rays
Functional magnetic resonance imaging (fMRI) is possible due to the artifact created by what?
Magnetic signals created by current flow
Which neuroimaging method can be used to image benzodiazepine and dopamine receptors?
Positron emission tomography (PET)
Which neuroimaging method disrupts brain activity?
Transcranial magnetic stimulation (TMS)
Which neuroimaging method has the potential to reveal the criticality of a brain area to generation of an observed behavioral response?
Transcranial magnetic stimulation (TMS)
Which neuroimaging method can be used with patients with metal implants?
Electroencephalogram (EEG)
Which neuroimaging method involves changes of electrical potential differences at the scalp?
Electroencephalogram (EEG)
T/F - EEG and EMG provide a direct measure of neural activity.
True
T/F - EEG and MEG provide a direct measure of blood flow
False
T/F - EEG and MEG provide a direct measure of underlying anatomical structure
False
What does an MEG signal measure?
Changes in magnetic flux at the scalp generated by electrical current in the brain
T/F - Cortical generators of MEG/EEG signals are so sensitive that they can see firing of individual neurons
False
T/F - The largest contribution to cortical generators of MEG/EEG signals comes from post-synaptic currents in pyramidal cell dendrites
True
T/F - Glial currents are significant cortical generators of MEG/EEG signals and can be easily identified in data
False
T/F - There must be some synchronization of activity across thousands of neurons in order to generate MEG/EEG signals
True
What does tDCS stand for?
Transcranial direct current stimulation
What are some of the advantages of tDCS as compared to other neuroimaging methods?
It’s low risk, minimally invasive, inexpensive, and easy to use
T/F - tDCS induces neuronal firing
False
T/F - tDCS requires a battery and electrodes to operate
True
In repetitive TMS, does low frequency (<5Hz) stimulation increase or decrease cortical inhibition?
Increase
In repetitive TMS, does high frequency (>10Hz) stimulation increase or decrease cortical inhibition?
Decrease
