EEG 208 Final Exam Questions and
Answers
Common in patients who are anxious, this delta frequency artifact is recorded in the frontal electrodes
and eliminated by gently touching the patient's eyelids. - Answer-Eye flutter
What should the technologist do if they suspect that the EEG channels are recording EKG artifact? -
Answer-Confirm it by monitoring EKG and comparing the timing. Consider changing to a bipolar
montage.
Why does an electrode with poor impedance record more 60 Hz noise? - Answer-***IDK, not "It
doesn't. Impedance has nothing to do with 60 Hz noise. 60 Hz noise is an environmental problem and
must be eliminated by unplugging electronic devices."
other choices:
-As long as impedances are low and balanced, common mode rejection eliminates 60 Hz noise. Since 60
Hz affects all electrodes equally it is eliminated through cancellation.
-High impedance electrodes are usually in the frontal area and frontal electrodes are more likely to
record 60 Hz
Generated by voltages present in the retina when bright light is introduced: - Answer-ERG
Cell phone artifact as recorded by an EEG instrument has the appearance of: - Answer-frequency range
of 7 to 45 Hz, with amplitude maximal when phone is near the amplifier, not the electrodes.
, True or False: EMG artifact is always symmetrical. - Answer-False
Term used for electrodes placed to record eye movements: - Answer-EOG
If an electrode continues to pop after reapplication of skin prep and replacement of the electrode with
another electrode, what would be the next step? - Answer-Move the electrode to another jack in the
electrode box and see if the pop follows the electrode or stays with the jack
Artifacts caused by drying of electrolyte, dirty electrodes, electrode of different metal types or unsecure
attachment at the scalp electrolyte interface are called: - Answer-Electrode Pops
Movement associated with the patient's heartbeat: - Answer-Ballistocardiographic artifact
Involuntary repetitive eye movements with a very fast and a slow component: - Answer-Nystagmus
True or False: Piezoelectric sensors measure electrical potential caused by mechanical force. - Answer-
True
In EEG the term "artifact" refers to: - Answer--Non-physiological potentials recorded from the
environment
-Physiological potentials from source other than brain, such as EMG, EOG, EKG
-Electrical noise from within the EEG instrument
Loss of organized QRS complexes and P and T waves that are impossible to discern would indicate
________, a most serious condition often resulting in death if not treated with DC shock. - Answer-
Ventricular fibrillation (V-Fib)
Answers
Common in patients who are anxious, this delta frequency artifact is recorded in the frontal electrodes
and eliminated by gently touching the patient's eyelids. - Answer-Eye flutter
What should the technologist do if they suspect that the EEG channels are recording EKG artifact? -
Answer-Confirm it by monitoring EKG and comparing the timing. Consider changing to a bipolar
montage.
Why does an electrode with poor impedance record more 60 Hz noise? - Answer-***IDK, not "It
doesn't. Impedance has nothing to do with 60 Hz noise. 60 Hz noise is an environmental problem and
must be eliminated by unplugging electronic devices."
other choices:
-As long as impedances are low and balanced, common mode rejection eliminates 60 Hz noise. Since 60
Hz affects all electrodes equally it is eliminated through cancellation.
-High impedance electrodes are usually in the frontal area and frontal electrodes are more likely to
record 60 Hz
Generated by voltages present in the retina when bright light is introduced: - Answer-ERG
Cell phone artifact as recorded by an EEG instrument has the appearance of: - Answer-frequency range
of 7 to 45 Hz, with amplitude maximal when phone is near the amplifier, not the electrodes.
, True or False: EMG artifact is always symmetrical. - Answer-False
Term used for electrodes placed to record eye movements: - Answer-EOG
If an electrode continues to pop after reapplication of skin prep and replacement of the electrode with
another electrode, what would be the next step? - Answer-Move the electrode to another jack in the
electrode box and see if the pop follows the electrode or stays with the jack
Artifacts caused by drying of electrolyte, dirty electrodes, electrode of different metal types or unsecure
attachment at the scalp electrolyte interface are called: - Answer-Electrode Pops
Movement associated with the patient's heartbeat: - Answer-Ballistocardiographic artifact
Involuntary repetitive eye movements with a very fast and a slow component: - Answer-Nystagmus
True or False: Piezoelectric sensors measure electrical potential caused by mechanical force. - Answer-
True
In EEG the term "artifact" refers to: - Answer--Non-physiological potentials recorded from the
environment
-Physiological potentials from source other than brain, such as EMG, EOG, EKG
-Electrical noise from within the EEG instrument
Loss of organized QRS complexes and P and T waves that are impossible to discern would indicate
________, a most serious condition often resulting in death if not treated with DC shock. - Answer-
Ventricular fibrillation (V-Fib)
