Abstract: Embodiments include apparatuses, methods, and a computer system including a calibrator that may calibrate sensor data of a plurality of sensors of a head worn wearable adorn on a head of a user. The calibrator may calibrate sensor data for one or more notifications or events to generate calibrated sensor data that reflects physical attributes, positions or postures of the user. The calibrated sensor data may be used to determine an orientation or movement of the head of the user, which may further be used to detect a head gesture defined by the user that corresponds to a computer command. Other embodiments may be described and/or claimed.