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   June 2015

  2-Channel Training and Jumpers

A while ago we had described the use of two jumpers and 3 electrodes for 2-channel training. This method was used for some time because it seemed simpler and less confusing. But it was also opening the door for more noise and artifact in the signal - including artifact with tactile feedback. Only in an optimum environment, free of electromagnetic disturbances, it leads to good signal quality.
We have now switched to using only one jumper and 4 electrodes and recommend that for everyone. Separating the ground connection restores common mode rejection and totally cleans up the signal.
  1. Use one jumper cable connecting channel 1 minus and channel 2 minus inputs.
  2. Connect black (ground) electrode directly to ground input. Ground electrode can go anywhere on head, for example on the mastoid.
  3. Channel 1 and channel 2 plus electrodes go to training sites such as T4-P4
  4. Last electrode connects to jumper cable. This is the common reference for both channels. You can use Cz.
Please note: During impedance measurement the jumpers must be pulled out of the minus-sockets, otherwise the impedance measurement will be faulty. Please do not forget to reattach the jumpers when continuing the Neurofeedback session.

Courses 2015 
In September 2015 EEG Info will be holding a Neurofeedback basic course in Spanish language in Barcelona.

A second basic course will be held in October in English language in Berg/Germany.

User Tip
Avoid damage to the NeuroAmp by electrostatic discharge

All electrical appliances and particularly high-precision measuring instruments such as the NeuroAmp are sensitive to the influence of external electromagnetic fields.
The NeuroAmp is galvanically isolated. Therefore, persons working with the Neuroamp are electrically decoupled and thus protected from electrical voltages up to 8000V.
However, a human can get charged up to 30000 V. Then a temporarily high discharge current can flow when the NeuroAmp or the electrodes are touched. Such high currents can destroy electronic components in the NeuroAmp. The then necessary repair is costly.

A few measures can help in your practice:
  • Use equipment, furniture and shoes made of antistatic materials
  • Use grounded mats on work surfaces and seats
  • Avoid dry air in your practice
Read more on this topic on our website here: ESD-Measures for Neurofeedback


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