Each device has an anodal, positively charged electrode and a cathodal, negative electrode. There are three different types of stimulation&colon; anodal, cathodal, and sham. Reversal of the stimulus polarization provided a mechanism for anodal stimulation of cardiac tissue. Dopamine also primes the brain activity with anodal tDCS into inhibition. Electrogustometry is the measurement of taste threshold by passing controlled anodal current through the tongue. As anodal tDCS is known to cause widespread activation it may trigger some effects.