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20 Cards in this Set
- Front
- Back
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A blown fuse illustrates which kind of circuit? |
A blown fuse illustrates an open circuit because the melted filament removes a path for free electron movement. |
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Which electroencephalograph differential input impedance specification is best? |
A differential input impedance specification of 10 Megohms is best. Higher values are preferred because they allow an instrument to capture more of the biological signal. |
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EEG electrodes are located ____ of the distance between the nasion and the inion and between the left preauricular point and right preauricular point. |
EEG electrodes are located 10 or 20% of the distance between the nasion and the inion and between the left preauricular point and right preauricular point. |
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Where is alpha amplitude lowest in a healthy subject? |
Alpha amplitude is lowest in the frontal lobe and highest in the occipital lobe. |
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______ is the correlation between the amplitudes of specific frequencies recorded at different sites over time and specific conditions. |
Comodulation is correlation between the amplitudes of specific frequencies recorded at different sites over time and specific conditions. |
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A 1-second exposure to current exceeding _______ mA can produce injury. |
A 1-second exposure to current exceeding 5 mA can produce injury. |
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How does a ground fault interrupt circuit protect against shock? |
A ground fault interrupt circuit protects against shock by triggering a circuit breaker when current leakage is detected. |
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Which term refers to the combination of electrodes used in a single amplifier channel? |
A derivation is the combination of electrodes used in a single amplifier channel. |
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A conservative guideline is that impedance values for disc electrodes should not exceed __ Kohms and should be balanced within __ Kohm(s) to ensure acceptable common-mode rejection and high sensitivity. |
A conservative guideline is that impedance values for disc electrodes should not exceed 5 Kohms and should be balanced within 1 Kohm to ensure acceptable common-mode rejection and high sensitivity. |
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Which would help reduce 60-Hz noise during EEG and sEMG recording? |
A differential amplifier helps reduce 60-Hz artifact by subtracting identical input signals. |
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Sterman recommends using ______ to represent EEG power in descriptive statistics. |
Sterman recommends using the natural log transformation of microvolts to represent EEG power in descriptive statistics. |
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Your electroencephalograph's digital display shows 2 microvolts. During which stage of processing was this value calculated? |
EEG signal amplitude is calculated during the integration stage. |
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Which of these describes a differential amplifier? |
A differential amplifier subtracts identical input signals. This allows the amplifier to achieve excellent signal-to-noise ratios. |
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Which filter only suppresses slow-wave activity? |
A low frequency filter suppresses slow-wave activity. |
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A 1-second exposure to currents above ____ mA can produce ventricular fibrillation. |
A 1-second exposure to currents above 50 mA can produce ventricular fibrillation. |
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_____ is characterized by a sudden large deflection in at least one channel when an electrode abruptly detaches from the scalp. |
Electrode pop artifact is characterized by a sudden large deflection in at least one channel when an electrode abruptly detaches from the scalp. |
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Which of these is an international EEG electrode placement system? |
The 10-20 International System of Electrode Placement is the world standard for electroencephalographers. |
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When there is a break in an electrode cable, impedance measured from one end to the other should be ____ ohms. |
When there is a break in an electrode cable, impedance measured from one end to the other should be infinite because there is no conductive path. |
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Which beta bandpass is used to measure theta/beta ratios in ADHD? |
The beta component of the theta/beta ratio is measured using a 13-21 Hz bandpass. |
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Which material produces the lowest electrode noise? |
Silver silver-chloride is preferred for constructing electrodes because it produces the lowest noise. |
