  The alpha and theta frequency brainwave activity in Electroencephalogram
(EEG) signal has been correlated with attention, inhibitory processes, memory,
perceptual abilities, and sleep. The enhanced alpha and theta brainwave
activity may bring positive behavioral modifications such as promoting
creativity and a quick sleep. Herein, we discover that infrared radiation from
multilayer graphene electrothermal film can obviously promote the appearance of
alpha and theta brainwave in human mind. In particular, the occurrence
frequency of the alpha and theta waves in EEG can be effectively enhanced up to
2.3 and 3.0 times, respectively. And the duration time of the alpha and theta
waves in EEG can also be effectively extended. The mechanism may be attributed
to the efficient infrared radiation caused by graphene mainly focused on the
range from 7 to 14 micron, coinciding with the radiation wavelength of natural
human body, which can be effectively absorbed by the human skin and speed up
the blood microcirculation and metabolism. The comparative effect of different
working temperature and heating materials such as water, Cu and even monolayer
graphene are systematically investigated, indicating the infrared radiation
from the multilayer graphene electrothermal film at 50 degrees has the largest
enhancement effect of alpha and theta brainwaves. The multilayer graphene film
electrical heater represents a convenient and surprising way for triggering the
alpha and theta brainwaves, which has many potential applications in the area
of enlarged health cerements.
