Brain stimulation techniques include the use of electricity, magnets or implants to touch the brain. They are used to treat depression and other mental health disorders, according to the National Institute of Medical Health.
The oldest form of brain stimulation therapy is electroconvulsive therapy, according to PsychCentral. This technique applies brief electric pulses to the scalp to stimulate seizures in the brain to cause the brain to release chemicals such as serotonin.
Rapid transcranial magnetic stimulation uses an electromagnetic coil placed on the scalp to send magnetic waves into the brain. This technique doesn't require an anesthetic.
Vagus nerve stimulation is a technique in which a device is planted in the chest to stimulate the vagus nerve in the neck. This alters the brain's chemical balance.