Electrical Engineering & Electronics /EEG Formulas and Terminology
EEG Formulas and Terminology
This flashcard deck covers essential EEG formulas and terminology, including definitions and relationships between key concepts such as frequency, sensitivity, and amplitude.
Frequency Formula
1/Duration or PS / V
Ex: To calculate this, divide the PS (mm/msec) by the wave length (mm).
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Key Terms
Term
Definition
Frequency Formula
1/Duration or PS / V
Ex: To calculate this, divide the PS (mm/msec) by the wave length (mm).
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Sensitivity (S) Formula
V / D (A or W)
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Voltage Formula
SD (A or W)
Duration Formula
V / S or V/PS X1000
Ex: To calculate this, measure the length (mm) of the wave and divide by the PS, then multiply by 1000.
Amplitude (D) Definition
(Wave length)
Measured in millimeters (mm).
The height of the wave.
Voltage (V) Definition
Measured in microvolts (mV or uV).
The power of the wave.
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| Term | Definition |
|---|---|
Frequency Formula | 1/Duration or PS / V
Ex: To calculate this, divide the PS (mm/msec) by the wave length (mm). |
Sensitivity (S) Formula | V / D (A or W) |
Voltage Formula | SD (A or W) |
Duration Formula | V / S or V/PS X1000
Ex: To calculate this, measure the length (mm) of the wave and divide by the PS, then multiply by 1000. |
Amplitude (D) Definition | (Wave length)
Measured in millimeters (mm).
The height of the wave. |
Voltage (V) Definition | Measured in microvolts (mV or uV).
The power of the wave. |
Duration Definition | Measured in miliseconds (msec).
The time it takes for a wave to occur in a period of time. |
Frequency Definition | Measured in hertz (Hz) or cycles per second.
How often a wave can occur in a period of time. |
Gain | The ratio of the output signal of the input signal (or) the amount of magnification being used to amplify or increase the voltage of a signal. |
Sensitivity (S) Definition | The amount of voltage for each 1(mm) of pen deflection and is expressed in uV/mm. |
Frequency and Duration Relation | Mathematical reciprocals of each other.
As the first increases, the second decreases and vice-versa. |
Paper Speed Definition | The amount of paper used in a particular length of time. |
Standard Paper Speed | EEG standard speed is 30mm/sec, which means every 30mm of paper is equal to 1 second.
1 large section on a page, 5 smaller sections. |
5 small divisions on paper equal... | 200 msecs. |
2 seconds recording time equals... | 1/2 Large division and 2.5 smaller divisions
15 mm/sec and 400 msecs. |
1/2 second recording time equals... | 2 large divisions and 10 smaller divisions.
60 mm/sec and 100 msecs. |
Nyquist Criteria | The sampling rate must be at least twice as fast as the fastest frequency being recorded.
3-4 times as fast is ideal for digital conversion. |
Aliasing | This occurs when there are not enough digitalized points made on the wave for accurate digital conversion. |
Amplification | Enlarges tiny electrical signals coming from the brain so they may be displayed on paper or digitally. |
Differential Amplifier | The output voltage is equal to the difference between the input voltages of G(rid) 1 and G2. |