RELATED APPLICATIONS

This application is related to U.S. Pat. Nos. 7,674,224; 10,653,857; U.S. Patent Publication No. 2020/0265827; and U.S. patent application Ser. Nos. 17/366,896, 17/505,453; all of which are incorporated herein by reference in their entirety.

BACKGROUND

For decades, neuroscientists have observed wave-like activity in the brain called neural oscillations. Aspects of these neural oscillations have been found to be related to mental states including attention, relaxation, and sleep. The ability to effectively induce and modify such mental states by noninvasive brain stimulation is desirable.

