BCIA Flashcards
Which term refers to electrical activity that appears at two respective input terminals of a differential amplifier?
Common mode signal EG. 50/60HZ artifact is a common mode signal in EEG
Which rhythm ranges from 7-11 HZ and is detected over the central or centro-parietal regions of the scalp when a patient is awake?
mu: This rhythm is composted of arch shaped waves that can be blocked or weakened by contralateral movement or the intention to move.
Which electrode is typically connected to input terminal 2 of an EEG amplifier and use to measure the potential variations of another electrode?
reference:
Which term refers to the unequal amplitude and/or form and frequency of EEG activity over corresponding areas on opposites sides of the head?
Asymmetry
Which of these is the ratio of the amplification of differential and common mode signals?
Common mode rejection
Which montage consists of referential derivations?
referential
Which montage permits the best analysis of asymmetry?
common reference: A common reference montage achieves good analysis of asymmetry provided that there is symmetrical placement of the reference electrode
Which term refers to the abrupt appearance and disappearance of a group of waves that can be discriminated from background activity.
Burst
A ______ refers to both the process of recording from a pair of electrodes in an EEG channel and the resulting EEG record.
derivation
Which term refers to the particular arrangement by which a number of pairs of electrodes in EEG channels are simultaneously displayed in an EEG record.
montage
A _________montage detects voltage differences between single, adjacent electrode.
Bipolar:
Which term refers to the difference between two unlike signals applied to the respective two input terminals of a differential amplifier?
Differential signal
Which montage best detects localized neural current sources?
Laplacian: A laplacian montage achieves excellent detection of localized neural current sources because it functions as a spatial high pass filter.
Which montage detects voltage differences between a single electrode and an average of the remaining electrodes weighted in proportion to their distance from the electrode placed in input 1?
Laplacian
Which term refers to the non-simultaneous occurrence of EEG activity in regions on the same or opposite side of the head?
asynchrony
Which electrode is placed over the scalp or brain to detect EEG activity?
active
A montage in which the reference electrode is common to multiple derivations is termed a _____montage.
Common reference
An________montage detects the voltage difference between a single electrode placed in input 1 and the average of the remaining 10-20 electrodes placed in input 2.
Average reference
The _____rhythm consists of burst of alpha or theta waves over the temporal region of the scalp when subjects are mentally active.
kappa
Which montages provide excellent detection of electrode artifact?
bipolar and common reference electrodes
Morphology refers to the ______of an EEG wave.
form
Which of these refers to a period of time in an EEG record?
epoch: eg: a 10 second epoch
A _______is a limited region of the scalp, cerebral cortex, or depth of the brain that displays specific EEG activity?
Focus
________is the ratio of the output signal voltage to the input signal voltage of an EEG channel.
Gain