The brain's electrical activity,
is maintained by billions of neurons.


Recording of electrical activity along the scalp

Electroencephalography (EEG) is the recording of electrical activity along the scalp. The brain's electrical activity, which is measured with the EEG, is maintained by billions of neurons. The EEG cannot pick up the electrical potential generated by a single neuron for it is far too small. Voltages measured by the EEG therefore always reflect the synchronous activity of thousands of neurons. The EEG is mostly produced by cortical neurons, because activity from deeper sources is more difficult to detect than currents near the skull. Most of the cerebral signal observed in the scalp EEG falls in the range of 1-20 Hz and have an amplitude in the range of 5-200 µV. However, meaningful activity up to several hundreds of Hz has also been reported.



An EEG can be performed by applying different electrodes on the scalp of the subject. In most clinical applications, 19 electrodes may be sufficient, but also set-ups up to 256 electrodes are used. Therefore so called EEG headcaps are often applied in which the electrodes are already integrated in a standard configuration. Most often the electrode configuration is according to the International 10-20 system, an internationally recognized method to describe and apply the location of scalp electrodes in the context of an EEG test or experiment. Measurement of EEG is often performed in the fields of Psychology and Neurology, but also in BCI (Brain Computer Interfacing), Neurofeedback or Neuro-Marketing.



• Epilepsy monitoring
• Measuring with DBS-electrodes
• BCI (Brain-Computer Interface)
• ERP (Event-Related Potentials)
• P300 research
• Neuro-marketing


Clinical research or Neuroscience?

TMSi systems vary from just a few channels to high density systems. Our sytems give access to data with quality you have never seen before.

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TMSi SAGA 32/64+

SAGA 32+/64+ is a 32 or 64 channel amplifier for electrophysiological measurements such as EEG or HD EMG. The SAGA consists of two separable parts, a Data Recorder and Docking Station.

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