Science Quiz

Random Science Quiz
Score 0/50 Timer 20:00
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Hint Answer % Correct
True or false: Good brain coverage is an advantage of fMRI.True
73.1%
fMRI is a technique for measuring brain ___.function
67.3%
Oxygenated blood goes to where neurons are ___ active.most
59.6%
What does BOLD stand for?Blood Oxygenation Level Dependent
53.8%
True or false: fMRI is a direct measure of neuronal activity.False
53.8%
Which has better temporal resolution: fMRI or EEG?EEG
51.9%
Oxygen is delivered to neurons by ___ in capillaries.hemoglobin
51.9%
fMRI has excellent ___ resolution.spatial
51.9%
How powerful is the magnetic field produced by a MR scanner?3 Tesla
50%
fMRI contrasts oxygenated blood with ___ blood.deoxygenated
50%
Oxygenated hemoglobin is repelled by magnetic field. The term for this is...diamagnetic
48.1%
True or false: fMRI is non-invasive, with no radiation.true
48.1%
Disadvantage of fMRI: ___ measure of brain activity.Indirect
44.2%
Deoxygenated hemoglobin is attracted by a magnetic field. The term for this is...paramagnetic
42.3%
The magnetic field aligns ___ atoms along the B0 axis.hydrogen
42.3%
Stimulus-induced hemodynamic response is typically delayed by this long.2 sec
42.3%
True or false: fMRI is relatively difficult to use.false
42.3%
An MR scanner is really just a big...magnet
42.3%
As hydrogen protons realign, they emit ___ that is captured by the scanner's computer.energy
40.4%
Advantage of resting state fMRI: Potential for greater ___ across labs.consistency
36.5%
Outside the magnetic field, hydrogen atoms are ___ aligned.randomly
36.5%
A simply-designed fMRI paradigm uses a stimulus versus ____ condition.baseline
34.6%
fMRI obtains a sequence of ___-resolution volumes.low
34.6%
Each ___ contains a time-varying BOLD signal.voxel
34.6%
Disadvantage of fMRI: slow ___ ___.temporal resolution
34.6%
Hint Answer % Correct
Resting state fMRI acquires images during a __-minute period of rest.Six
32.7%
What tips hydrogen protons away from equilibrium?Radio frequency pulse
30.8%
What pulls the hydrogen atoms back up to B0?Magnet
30.8%
A patient with a pacemaker has had traumatic brain injury. Do you do resting state fMRI or task-based MRI to assess their functioning?NEITHER THEIR HEART WILL GET RIPPED OUT
30.8%
In a simple fMRI design, the pattern of rest and activation.ABABA
28.8%
Disadvantage of fMRI: Scanner can be ___.uncomfortable
25%
fMRI typically takes this many volumes in a ten-minute session.200
25%
When is fMRI contraindicated? (one word)metal
25%
Good match between voxel activity and predicted model indicates activity related to the ...stimulus
25%
Magnetic Force + ___ ___ = pictures.Radio waves
23.1%
It takes this much time for blood to flow from arteries to capillaries & draining veins.2 sec
21.2%
In a simple fMRI design, stimulus intensity is...constant
21.2%
In a simple fMRI design, block lengths are...constant
21.2%
In fMRI analysis, the stimulus induced change in BOLD signal is compared to the ___ ___.predicted response
21.2%
Resting state fMRI examines ___ amplitude fluctuations in BOLD signal.large
21.2%
Resting State fMRI examines ___-frequency fluctuations in BOLD signal.low
21.2%
Advantage of resting state fMRI: Can probe a large number of ___ with one study.networks
21.2%
Imaging optimized for BOLD ___ and ___.sensitivity and speed
21.2%
fMRI signal plateaus after this many seconds.6-12
19.2%
Advantage of resting state fMRI: Free of __ ___ such as ceiling, practice, and learning effects.task constraints
19.2%
fMRI takes one volume per this amount of time.3 sec
17.3%
In fMRI studies, why are baseline/rest conditions needed?To measure change
17.3%
The temporal correlations of BOLD fluctuations across regions.functional connectivity
17.3%
In resting state fMRI, you would correlate activity in different voxels to discover...functional connectivity
15.4%
Amy used this word on a slide!orthogonal
15.4%
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Created Dec 14, 2014ReportNominate
Tags:Extra

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