Investigation of the dynamics of the ear and ear canal
The baseline data of the study were laser-scanned ear impressions taken in four different conditions
• Jaw in relaxed position
• With a bite-block in the mouth (similar to yawning)
• Head turned to the side away from the ear
• Head bowed down
Data from 30 normal-hearing ears was collected in the pilot study, while data from 42 hearing-aid users was collected in the main study. The hearing-aid users also completed an 8-item questionnaire covering physical fit, physical comfort, and acoustical feedback. Separate statistical shape models were built for each of the four conditions.