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WorksheetsNeuroimaging & Cortical Potentials
Total questions: 25
Worksheet time: 13mins
1) The EEG primarily records activity from which neuronal structures?
Axons of motor neurons
Synaptic terminals of interneurons
Dendrites of cortical pyramidal cells
Glial cell bodies
2) Which frequency band is dominant during deep dreamless sleep?
Beta (>13 Hz)
Delta (1–3 Hz)
Theta (4–7 Hz)
3) The "10–20 system" is associated with:
Placement of MEG sensors
Electrode placement in EEG
CT slice thickness standardization
MRI imaging planes
4) A major limitation of EEG is:
Poor temporal resolution
Poor spatial resolution
Exposure to radiation
High acquisition cost
5) MEG primarily detects:
Electrical fields from pyramidal neurons
Calcium ion concentration
Magnetic fields generated by neuronal activity
Gamma ray emissions
6) The instrumentation of MEG requires:
Magnetically shielded room
Open-air environment
Radiotracers
Gamma detectors
7) Which imaging technique directly involves radioactive tracers?
MRI
fMRI
MEG
PET
8) The most widely used tracer in PET for brain studies is:
F18-labeled deoxyglucose (FDG)
Oxygen-15
Carbon-11
Gallium-68
9) A primary advantage of PET over fMRI is:
No exposure to radiation
Ability to study molecular and biochemical processes
Higher temporal resolution
Cheaper and widely available
10) The signal measured in fMRI is based on:
Sodium ion flux
Gamma ray emissions
Blood Oxygen Level Dependent (BOLD) effect
Calcium influx
11) Which of the following describes the "initial dip" in the fMRI hemodynamic response?
Complete signal loss
Overshoot of oxygen supply
Delay in blood flow
Increase in deoxyhemoglobin due to oxygen consumption
12) The N400 component is most sensitive to:
Phonological mismatches
Semantic incongruence
Motor planning errors
Visual motion detection
13) Typical latency of N400 in young adults is:
50–100 ms
200–250 ms
600–700 ms
380–440 ms
14) N400 amplitude is generally reduced when:
The word is semantically unrelated
The word is highly predictable in context (high cloze probability)
The stimulus is a pseudoword
The sentence ends with a rare or unexpected word
15) The T-complex is best described as:
A sleep-related EEG pattern
A metabolic measure of PET
Auditory evoked potentials recorded at temporal sites
An MRI contrast mechanism
16) The Ta peak of the T-complex typically occurs around:
50 ms
105–110 ms
200–250 ms
400 ms
17) Which imaging method is fastest and most often used in emergencies for head injury?
PET
MRI
fMRI
CT
18) In CT imaging, a hyperdense area usually represents:
Hemorrhage or calcification
CSF
Brain edema
Air-filled cavity
19) MRI relies on the magnetic properties of:
Calcium stores
Potassium channels
Sodium ions
Hydrogen protons
20) Which MRI sequence is most sensitive to acute ischemic stroke?
T1-weighted
FLAIR
Diffusion-Weighted Imaging (DWI)
SWI
21) Which EEG wave is dominant when a person is awake, alert, and fully conscious?
Delta
Theta
Alpha
Beta
22) MEG offers an advantage over EEG because:
It is less distorted by skull and scalp tissues
It is cheaper and easier to set up
It detects activity from deeper brain structures with high accuracy
It has better temporal resolution than EEG
23) A major disadvantage of PET compared to MRI is:
Poor spatial resolution
Low cost of operation
Inability to study molecular activity
Exposure to radiation from radioactive tracers
24) In fMRI, the “undershoot” of the hemodynamic response refers to:
Excess blood oxygenation above baseline
Blood flow and oxygen consumption dip before returning to baseline
Rapid buildup of deoxyhemoglobin
Complete absence of neural activity
25) Which clinical condition is most accurately diagnosed with CT in the acute stage?
Multiple Sclerosis
Dementia
Intracranial hemorrhage
Aphasia
