Passive electrodes are usually made of silver/silver chloride (Ag–AgCl) and many systems typically use electrodes attached to individual wires. These electrodes are applied to the scalp using a conductive gel or paste, usually after preparing the scalp area by light abrasion to reduce electrode-scalp impedance.

Personal opinion: Passive electrodes are the electrodes that I take more time/work to get a good impedance. Sometimes I am not able to get the wished impedance for some electrodes.

Example of passive electrodes:  

BrainCap – with EEG hardware BrainVision BrainAmp Standard (plus) or BrainVision MOVE

BrainCap MR – with EEG hardware BrainVision BrainAmp MR (plus)

LiveCap – with EEG hardware BrainVision LiveAmp

This Knowledge base is part of a blog cotaining all electrodes types. To access this blog click here