The symbol 'G1' represents which electrode in the standard setup?

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Multiple Choice

The symbol 'G1' represents which electrode in the standard setup?

Explanation:
In EEG recording, each channel is formed from a pair: an active (exploring) electrode and a reference electrode. The symbol G1 is used to label the active input for that channel—the electrode that actually “explores” brain potentials. The reference electrode provides the baseline for comparison, while the patient ground is a separate lead used to reduce noise and does not define a single channel. The signal that the polysomnograph shows is the amplified difference between the exploring electrode and its reference, not an electrode itself. So G1 corresponds to the exploring electrode.

In EEG recording, each channel is formed from a pair: an active (exploring) electrode and a reference electrode. The symbol G1 is used to label the active input for that channel—the electrode that actually “explores” brain potentials. The reference electrode provides the baseline for comparison, while the patient ground is a separate lead used to reduce noise and does not define a single channel. The signal that the polysomnograph shows is the amplified difference between the exploring electrode and its reference, not an electrode itself. So G1 corresponds to the exploring electrode.

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