Summed standardised difference scores when comparing the acoustic voice measures of the targets with those of the impersonators and ‘matched other’ celebrities. Note that the summed standardised scores represent the combined differences in fundamental frequency (F0), pitch variability (F0 standard deviation), vocal tract shape (F4), vocal turbulence (jitter (local), shimmer (local)), and hoarseness (harmonics to noise ratio). Bold text indicates the celebrity targets for whom the impersonator is more similar to the target than is the ‘matched other’.