Every year, clinical depression afflicts more than 18 million Americans, many of whom don't respond to conventional antidepressants like Prozac and Zoloft. But a promising new type of therapy is gaining wider use. The technique, called "transcranial magnetic stimulation," uses pulses of magnetic energy to induce electric currents in specific brain regions. While no one knows exactly why it works, researchers say the treatment can alleviate depression.

Select from the choices above to read the entire article.