Fig. 6
From: Printable 3D vocal tract shapes from MRI data and their acoustic and aerodynamic properties

Confusion matrices obtained from the listening experiment with the naturally-produced stimuli (reference) and the artificially generated stimuli (model) using the 3D-printed vocal tract models. The left two columns of subpanels show the confusion matrices for subject 1, and the right two columns for subject 2. The top, middle, and bottom rows of subpanels show the results for the tense vowels, the lax vowels, and the fricatives, respectively. As each stimulus was rated five times by 20 listeners, the numbers in the matrices are both absolute values and percentage values.