Method of separating ear canal wall movement information from sensor data generated in a hearing device

A method of processing sensor data generated in a hearing device is disclosed, the hearing device comprising a BTE housing configured to be worn behind an ear of a user and an ITE housing configured to be at least partially inserted into an ear canal of the ear. The method may include receiving, from a movement sensor included in the BTE housing, BTE housing movement data indicative of movements of the BTE housing; receiving, from an ear canal sensor included in the ITE housing, ear canal sensor data affected by movements of an ear canal wall, characterized by determining a correlation between the BTE housing movement data and at least part of the ear canal sensor data; and separating, based on the correlation, information about movements of the ear canal wall relative to the BTE housing from at least part of the ear canal sensor data.