Brain-Computer interface is one of evolving research field nowadays. Among other brain activity monitoring methods, Electroencephalography (EEG) is the most popular method because of it has some advantages over others. EEG is non-invasive, portable, allows passive recording and inexpensive. EEG research, as well as the technology of headsets which is using to collect data, improves rapidly in last decade. There are several consumer-grade headsets are in the market with a different number of electrodes. Usually, electrodes are placed on the scalp of the head according to the international placement method.
Recently, some researchers found a new way of recording EEG signals without placing electrodes on the head. This is called in-ear recording concept proposed by David Looney, Preben Kidmose, Cheolsoo Park, Michael Ungstrup, Mike Lind Rank, Karin Rosenkranz, and Danilo P. Mandic at 2012 (Related article can be found here). The device is like earpiece/earbud that we usually use to listen to music. Electrodes are attached to the earpiece. Unlike other EEG devices, this device provides more portability, less time to calibrate, comfortable, provides better contact with the body. The device has been tested with on-scalp EEG device and confirmed its accuracy.
Now, there is an end-product that we can buy on the market which uses the same concept. This product is launched by the Mind Solutions, Inc. This device is compatible with the NeuroSky platform. The video demonstrated some functions in NeuroSky software platform with this device.
Most of the time the hardest part of EEG research is recording EEG signals from test subjects. This kind of technology will accelerate the improvement of this research area. People can record EEG data anytime, anywhere even if this device has few electrodes.