Wireless sensor that sits behind the ear

There was a short article in the October IET magazine about using a small ZigBee sensor the size of a hearing aid to collect and transmit data from the human body. I suspect that hearing-aid-size sensor, which is “inspired by the semicircular canals of the inner ear responsible for controlling motion and balance”, is probably only made up of a simple accelerometer sensor, which can be easily found in most prototype wireless sensor motes on offer in the market nowadays. Nothing earth-shattering really, in my opinion, merely decoupling a simple sensor from wires. If the “whole package” is just about monitoring raw data collected from the sensor then that is even more disappointing. The power of modern sensor network lies in its ability to gather information from multiple cheap wireless sensors, with the resultant information giving more accurate insight into the sensed object or enviroment than a single sensor can achieve. I’d expect more from the “pioneer” in body sensor networks!