Active and passive EEG electrodes for TMS
g.LADYbird TMS-EEG electrodes are designed for high-quality EEG recording during TMS. Their flat, 3 mm profile lets the TMS coil sit as close to the head as possible: stronger stimulation, a cleaner signal. Active and passive versions suit different research needs, and with the g.HIamp amplifier and g.HIsys Professional they support closed-loop experiments.
The g.LADYbird active electrode carries a high-quality preamplifier at its tip: the signal is amplified as close to its source as possible and noise drops markedly. The electrodes run through g.HIamp's active electrode box. The active version's main advantage is reliable recording at far higher impedances than passive electrodes allow; no abrasive skin preparation is needed.
The passive electrode holds no electronic components, so electromagnetic artefacts from TMS stimulation are kept to a minimum and a clean EEG signal is available only milliseconds after the TMS pulse. In short-latency evoked potential (EP) recordings with TMS in particular, the signal returns to its normal level quickly. An electrode-skin impedance of 1–5 kΩ, reached with abrasive gel, is recommended.
The electrodes connect to g.HIamp, which streams the data into g.HIsys Professional, so closed-loop experiments can be designed. Real-time recording in g.Recorder, then TMS artefact removal in g.BSanalyze: a complete 64-channel TMS-EEG set-up.
The responses of TMS-stimulated regions recorded with EEG at the same time.
Following how TMS protocols change brain activity.
Stimulation steered by the EEG, with g.HIamp and g.HIsys Professional.
Short-latency EPs, with a signal that recovers quickly after the TMS pulse.
Talk to our team about device selection, protocol design, installation and software integration. We will work out the technical configuration that best fits your research or clinical goal.
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