Electrode Placements - foc.us GO FLOW 4 User Manual & Warranty

ELECTRODE PLACEMENTS

The effects of tDCS and sotDCS depend on the positioning and polarity of the electrodes.
Anodal stimulation induces an increase in cortical excitability under the X electrode. Cathodal
stimulation induces an increase in cortical inhibition under the Y electrode. When electrodes
are placed on the shoulder or arm, the exact location is less important than when placed on the
head, so long as the correct arm/shoulder is used i.e. left or right.
The most common system for electrode positioning is know as the 10-20 system. This system
involves measuring your head and placing electrodes at the10%, 20%, 20%, 20%, 20% and 10%
positions. This is shown in the dark circles below. The 10-20 system has been further divided
into smaller percentages as shown by the gray circles in the same figure.
The focus headband is not designed to be as precise as the 10-20 system. The best way to find
accurate electrode placements is to use the montages as a starting guide only. Measure the
results from stimulation and use trial and error to find the exact location for your personal
physiology.
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