<p>tACS is a form of electrical stimulation that uses two electrodes (a positive electrode called an anode and a negative electrode, the cathode) to pass current back and forth through either the brain or the body. It is called alternating current because the side which is giving and receiving electrons (anode and cathode) continuously switches. Any frequency, or blend of frequencies, can be given with these devices. So, if a patient is in need of more delta, the clinician can stimulate them in the delta frequencies. This technology is engineered, developed, and sold through Neurofield, Inc, (founded by Nicholas Dogris and Brad Wiitala). Clinicians use stimulation devices to help their patients heal, recover, and change the behavior of the brain and their bodies. As opposed to neurofeedback, neurostimulation shows the brain how to behave and the brain, like a copy cat, mimics the stimulation frequency.&nbsp;</p><p>In transcranial alternating current stimulation, one applies current and encourages neural synchronization. As electrons pass through the brain (from anode to cathode) the populations of neurons they go through become more likely to fire. This increased likelihood of firing is generalized to the entire area where current is applied. This can cause neurons which were formerly out of phase with each other to align. This happens not just during treatment, but is hypothesized to cause lasting changes to the brain. This is called Spike Timing Dependent Plasticity.&nbsp;&nbsp;</p><p><br></p><p><img src="@@PLUGINFILE@@/tacs-current.png" alt="" width="777" height="415" role="presentation" class="img-responsive atto_image_button_text-bottom"><br></p><p style="text-align: center;">Figure : The Mechanism of transcranial Alternating Current Stimulation<br></p><p style="text-align: center;"><br></p><p style="text-align: center;"><br></p>