Brain Products caps that are designed for EEG and TMS recordings are fitted with so-called (passive) Multitrodes and have very thin electrode holders (less than 4 mm). This solution allows the TMS coil to be placed very close to the scalp and elicits the evoked response with low magnitude stimulus.
In the standard cap version, every electrode can be freely rotated, thus always allowing the best cable geometry for any stimulation point, a crucial feature for successful EEG recordings during TMS stimulation. In fact, it has been proved that a cleaner signal can be recorded by orienting the cables away from the coil or coil cable.
A special version particularly suitable for working with a large number of channels or with an identical TMS stimulation point is also available on request.
Want to use active electrodes for your EEG & TMS research? Check out the actiCAP slim.