title: Analysis of surfaces using constrained regression models.
abstract: We present a study of the relationship between the changes in the shape of the human ear due to jaw movement and acoustical feedback (AF) in hearing aids. In particular, we analyze the deformation field of the outer ear associated with the movement of the mandible (jaw bone) to understand its effect on AF and identify local regions that play a significant role. Our data contains ear impressions of 42 hearing aid users, in two different positions: open and closed mouth, and survey data including information about experienced discomfort due to AF. We use weighted support vector machines (WSVM) to investigate the separation between the presence and lack of AF and achieve classification accuracy of 80% based on the deformation field. To robustly localize the regions of the deformation field that significantly contribute to AF we employ logistic regression penalized with elastic net (EN). By visualizing the selected variables on the mean surface, we provide clinical interpretations of the results.
authors.affiliation: Department of Informatics and Mathematical Modelling, Technical University of Denmark, Denmark. sda@imm.dtu.dk
authors.forename: Sune
authors.initials: S
authors.lastname: Darkner
authors.forename: Mert R
authors.initials: MR
authors.lastname: Sabuncu
authors.forename: Polina
authors.initials: P
authors.lastname: Golland
authors.forename: Rasmus R
authors.initials: RR
authors.lastname: Paulsen
authors.forename: Rasmus
authors.initials: R
authors.lastname: Larsen
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D003198:Computer Simulation; D004431:Ear, External / Q000033:anatomy & histology*; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008954:Models, Biological; D015233:Models, Statistical; D010363:Pattern Recognition, Automated / Q000379:methods*; D012044:Regression Analysis; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity