Transcranial direct current stimulation (tDCS) is constant, low electrical stimulation of targeted areas of the brain. tDCS is a form of neuromodulation that can be useful for those diagnosed with major depressive disorder and reducing negative symptoms for those with schizophrenia. tDCS is a safe and effective way to help individuals feel better and experience long lasting effects. tDCS stimulates neurons to be hyperpolarized or depolarized, depending on brain scans, symptomology and placement of electrodes. Modifying the polarization of neurons changes how often the neuron fires after treatment. Pairing stimulation with neurofeedback training has shown proven and lasting results, below are some studies that provide more information.