Sony has filed a patent for a "SmartWig" that would include ultrasound sensors, a camera and a laser pointer. The device is not necessarily intended to replace absent hair, as with traditional wigs, but to be worn as a sort of mobile computer.
The patent describes a "plurality of natural and/or artificial hair pieces" which will hide within them a range of sensors and communication devices. That artificial hair could be wool or horse hair, or just synthetic fibres, suggests Sony.
They are not stopping at the PS4 then. Dr Strabismus (whom God preserve) of Utrecht has reminded me that I will need to take off my SmartWig whenever I schedule an iGrow laser session.