HI, LLC, doing business as Kernel, is an American company that has developed a non-invasive neuroimaging technology.

[4][5][3] Kernel also introduced "Sound ID," a software that can tell what speech or song a person is listening to just from brain data.

[9][10] fNIRs uses infrared light to measure changes in the oxygenation of blood, which is a proxy for neural activity.

[14] Kernel is one of several companies researching links between the human brain and computer interfaces, including Neuralink, Precision Neuroscience, Synchron, and Facebook.

[15] Kernel also offers neuroscience as a service to scientists and businesses, conducting subject testing at their office.