2) Feature extraction:
In Mindset, there is a chip called ThinkGear which is used
to process all obtained signals from the dry sensor, and
calculate the signal data with its own commercial eSence
algorithm inside. The output values of ThinkGear are mainly
divided into two types: attention and meditation. Among them,
the meditation value is used to indicate the level of a user’s
mental stress. Both the attention value and meditation value
are on a scale of 0 to 100, and output to external devices via
Bluetooth.
III. CONNECTION BETWEEN BCI AND ANDROID SMARTPHONE
The Mindset read the biological signals generated by
user’s brain, and output the results to Android smartphone via
wireless Bluetooth. To create a communication between
Mindset BCI and Android phone successfully, the Bluetooth
data packets returned by Mindset should be strictly defined,
and the process of application on Android system must be
obeyed exactly.
A. Packet Structure of BCI Bluetooth Data