Figure 4. Experiment 2: at the acoustical level, voice similarity is mainly associated with vocal folds' features.

Upper panels: 2-dimensional spaces resulting from the INDSCAL analysis, summarizing the perceptual organization of files from experiment 2 on voice similarity. For each target (red), we show the impersonators' caricatures (blue), replicas (green) and normal voices (pink). We further submitted this data to a redundancy analysis to find the combination of acoustic parameters explaining the variance of the perceptual data. The resulting biplots are shown in the lower panels with the vectors indicating the correlation between the main acoustic parameters and the axes of ordering space.