True/False: An artifact is a waveform in the EEG that is of cerebral origin - AN-
SWER False
Electrical events of cerebral origin should show a distribution of intensity on the scalp sur-
face that is ___ with the brain wave activity - ANSWER Consistent
Certain ___ are characteristic of certain types of artifact - ANSWER -Waveshapes
-Patterns
-Morphologies
In general, negative events tend to be topographically ___ everywhere - AN-
SWER Negative
In general, positive event tend to be topographically ___ everywhere - ANSWER Posi-
tive
Disparate and distant deflections on the scalp with varying ___ are much more suggestive of
motion artifact that cerebral activity - ANSWER Polarities
___ describes the event that the eyes deviate upward when people close their eyes - AN-
SWER Bell's Phenomenon
The cranial nerves that move the eyes are: - ANSWER -III
-IV
1
, -VI
True/False: The type of artifact that an upward movement of the eye might cause during eye
blinking or eye closure is not intuitively obvious without knowing that the globe of the eye
has a particular distribution of charge - ANSWER True
When movement is caused by epileptic myoclonus, there is always a slight time lag between
the EEG burst and the monitored movement this is because it takes some time for the: - AN-
SWER Cortical signal to propagate through the nervous system to the muscle
Sharp transients may represent electromyogram (EMG or muscle) artifact from activations of
the ___ muscle during lateral eye movements - ANSWER Lateral rectus
True/False: Electrode pops may occur because of a buildup of static charge in an individual
electrode followed by a very slow delayed release of that charge - ANSWER False
True/False: Sometimes an electrode pops because it has been poorly applied, but frequently
there is no clear explanation for electrode popping - ANSWER True
True/False: Lateral eye movements may cause an artifact that appears in the anterior tem-
poral (F7 & F8) area with each lateral eye movement. It is important to recognize this artifact
so as not to mistake these sharp transients for true epileptic spikes - ANSWER True
The concept of biological (brain wave) events vs artifact - ANSWER When there is field
in at least some of the surrounding electrodes
The concept of correctly identifying an artifact is more likely when there - ANSWER Is
not a field in the surrounding electrodes
True/False: Although electrode popping often occurs as an isolated event, sometimes highly
repetitive popping can occur which can resemble seizure activity - ANSWER True
2
SWER False
Electrical events of cerebral origin should show a distribution of intensity on the scalp sur-
face that is ___ with the brain wave activity - ANSWER Consistent
Certain ___ are characteristic of certain types of artifact - ANSWER -Waveshapes
-Patterns
-Morphologies
In general, negative events tend to be topographically ___ everywhere - AN-
SWER Negative
In general, positive event tend to be topographically ___ everywhere - ANSWER Posi-
tive
Disparate and distant deflections on the scalp with varying ___ are much more suggestive of
motion artifact that cerebral activity - ANSWER Polarities
___ describes the event that the eyes deviate upward when people close their eyes - AN-
SWER Bell's Phenomenon
The cranial nerves that move the eyes are: - ANSWER -III
-IV
1
, -VI
True/False: The type of artifact that an upward movement of the eye might cause during eye
blinking or eye closure is not intuitively obvious without knowing that the globe of the eye
has a particular distribution of charge - ANSWER True
When movement is caused by epileptic myoclonus, there is always a slight time lag between
the EEG burst and the monitored movement this is because it takes some time for the: - AN-
SWER Cortical signal to propagate through the nervous system to the muscle
Sharp transients may represent electromyogram (EMG or muscle) artifact from activations of
the ___ muscle during lateral eye movements - ANSWER Lateral rectus
True/False: Electrode pops may occur because of a buildup of static charge in an individual
electrode followed by a very slow delayed release of that charge - ANSWER False
True/False: Sometimes an electrode pops because it has been poorly applied, but frequently
there is no clear explanation for electrode popping - ANSWER True
True/False: Lateral eye movements may cause an artifact that appears in the anterior tem-
poral (F7 & F8) area with each lateral eye movement. It is important to recognize this artifact
so as not to mistake these sharp transients for true epileptic spikes - ANSWER True
The concept of biological (brain wave) events vs artifact - ANSWER When there is field
in at least some of the surrounding electrodes
The concept of correctly identifying an artifact is more likely when there - ANSWER Is
not a field in the surrounding electrodes
True/False: Although electrode popping often occurs as an isolated event, sometimes highly
repetitive popping can occur which can resemble seizure activity - ANSWER True
2
