Practice Questions Flashcards
The ground electrode in an EEG setup is used to:
a) Prevent electrical shock to pt
b) Serve as a reference for voltage comparisons
c) Reduce common-mode voltages and environmental noise
d) Enhance signal amplitude
c) Reduce common-mode voltages and environmental noise
Which neurotransmitter is primarily inhibitory in the CNS?
a) Glutamate
b) GABA
c) Acetylcholine
d) Dopamine
a) GABA
The occipital lobe is primarily responsible for processing:
a) Auditory information
b) Visual information
c) Sensory touch
d) Motor coordination
b) Visual information
What is the main function of the myelin sheathe?
a) Protect neurons from damage
b) Produce neurotransmitters
c) Increase the speed of nerve impulse conduction
d) Facilitate synaptic transmission
c) Increase the speed of nerve impulse conduction
Which part of the brain regulates vital functions like heartbeat and breathing?
a) Cerebellum
b) Hippocampus
c) Medulla oblongata
d) Thalamus
c) Medulla oblongata
The blood-brain barrier is primarily composed of:
a) Neuronal cell bodies
b) Tight junctions b/t endothelial cells
c) Astrocyte end-feet
d) Microglial cells
b) Tight junctions b/t endothelial cells
True/False: The temporal lobe is involved in processing auditory information
True
True/False: Efferent neurons carry signals towards the CNS
False
True/False: The sympathetic nervous system is responsible for “rest and digest” activities
False
True/False: Nodes of Ranvier are gaps in the myelin sheathe where action potentials are regenerated
True
True/False: The neurotransmitter dopamine is associated with reward and motivation pathways
True
Electrode impedance mismatch can result in:
a) Improved signal quality
b) Increased artifact susceptibility
c) Reduced signal amplitude
d) No effect on EEG
b) Increased artifact susceptibility
True/False: Silver-silver chloride electrodes are commonly used due to their low polarization potential
True
True/False: HV during EEG recording can decrease the amplitude of delta waves
False
Which EEG pattern is characteristic of an absence seizure?
a) 3 Hz spike-and-wave discharges
b) Continuous slow-wave activity
c) Generalized alpha activity
d) Periodic complexes
a) 3 Hz spike-and-wave discharges
Periodic lateralized epileptiform discharges (PLEDs) are most commonly associated with:
a) Migraine
b) Acute cerebral infarct
c) Hepatic encephalopathy
d) Multiple sclerosis
b) Acute cerebral infarct
In pts with hepatic encephalopathy, EEG typically shows:
a) Burst suppression patterns
b) Triphasic waves
c) Hypsarrhythmia
d) Multiple sclerosis
b) Triphasic waves
The presence of generalized slowing on the EEG is indicative of:
a) Focal cerebral dysfunction
b) Diffuse cerebral dysfunction
c) Normal aging
d) Artifact contamination
b) Diffuse cerebral dysfunction
True/False: Delta waves are typically common during deep sleep stages
True
True/False: Theta waves are most commonly seen in awake adults during mental activity
False
True/False: Epileptiform discharges always indicate the presence of epilepsy
False
Eye movement artifacts are typically most prominent in which electrode locations?
a) Occipital
b) Central
c) Frontal
d) Parietal
c) Frontal
The term “electrode pop” refers to:
a) Sudden loss of signal due to electrode detachment
b) A brief high-voltage transient caused by electrode instability
c) A consistent rhythmic artifact
d) Interference from electronic devices
b) A brief high-voltage transient caused by electrode instability
