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Questions and Answers
What are active electrodes used for in EEG?
What are active electrodes used for in EEG?
Active electrodes are used to detect the electrical signals generated by the neurons in the brain.
What is the purpose of a reference electrode in EEG?
What is the purpose of a reference electrode in EEG?
The reference electrode provides a stable voltage point against which the voltages detected by the active electrodes are compared.
How does EEG measure brain activity?
How does EEG measure brain activity?
EEG measures the difference in electrical potential between active electrodes and a reference electrode.
What is the function of ground electrode in EEG?
What is the function of ground electrode in EEG?
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What are the different types of electrodes used in EEG?
What are the different types of electrodes used in EEG?
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Study Notes
Active Electrodes in EEG
- Active electrodes detect and amplify electrical signals generated by neuronal activity in the brain.
- They are placed on the scalp and capture electrical potentials from brain regions directly beneath them.
Reference Electrode in EEG
- The reference electrode serves as a baseline for measuring the electrical activity of active electrodes.
- It helps in filtering out common noise and focusing on differential activity, improving the quality of the EEG signal.
Mechanism of EEG Measurement
- EEG measures brain activity by recording the voltage fluctuations resulting from ionic current flows within neurons.
- Electrodes convert these electrical signals into a readable waveform, which reflects brain activity over time.
Ground Electrode in EEG
- The ground electrode acts as a common return path for electrical signals in the EEG system.
- It minimizes electrical interference, enhancing the accuracy of the recordings by providing stability to the measurements.
Types of Electrodes Used in EEG
- Silver/Silver Chloride (Ag/AgCl) Electrodes: Commonly used for their stability and low noise characteristics.
- Gold Electrodes: Known for their excellent conductivity and durability but are generally more expensive.
- Carbon Electrodes: Provide good biocompatibility and are often used in low-cost applications.
- Disposable Electrodes: Made for single-use scenarios to avoid cross-contamination and ensure hygiene.
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Description
Test your knowledge on measuring electricity in EEG with this quiz! Learn about the different components of EEG, from active electrodes to intracellular and extracellular recordings. Explore how these components work together to measure brain activity.
