[1]
Neuronal excitation of
30 to 40% is achieved by
anodal (+) stimulation,
while inhibition of 20 to
30% is achieved by
cathodal (-) stimulation.
WHAT IS tDCS
When a DC current is applied over the scalp with the intention of
altering neuronal activity, it is known as transcranial DC Stimulation.
tDCS is effective in modulating spontaneous neuronal firing. Applying
tDCS at intensities of 1 milliamp for roughly 20 minutes has been shown
to either excite or inhibit the sensori-motor cortex, with the effects
typically lasting a few hours. However, effects from repeated use may be
permanent.
Anodal stimulation has also been shown to
increase both beta and gamma activity in
the visual cortex, while cathodal stimulation
has decreased beta and gamma activity.
Stimulation is generated by putting a wet
cloth, cotton ball or sponge on the scalp
over the brain regions to be affected and/or
a sponge or cotton ball on the shoulder or the face. The tDCS sessions
deliver a maximum intensity of 2.2 milliamps. To determine electrode
placement and intensity to use, you will need to consult research. See
Dave’s
tDCS article
at:
https://mindalive.com/tdcs/
The effectiveness and comfort of the Oasis Pro tDCS is based on a
current density of 50
μa/cm
2
for the small and long thin active
electrodes,
and less than 20μa/cm
2
for the large reference electrode. The
active electrode/sponge contact area is approximately 20 cm
2
. A
current of 1mA/20 cm
2
= 50
μA/cm
2
. The reference electrode/sponge
contact area is approximately 60 cm
2
. A current of 1ma/60 cm
2
=
17
μA/cm
2
.
Therefore, we recommend using the 1mA session with the electrodes
provided with this kit. Using currents higher than 1mA with the
electrodes provided may cause discomfort with no clinical gains.
