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Voice similarity in identical twins
W D Van Gysel1, J Vercammen, F Debruyne
1Department of ENT, Head and Neck Surgery, U.Z. St. Rafaël, Kapucijnenvoer 33, B-3000 Leuven.
Acta Oto-Rhino-Laryngologica Belgica
|March 21, 2001
Summary
Identical twins voices sound more alike than unrelated voices, though distinguishing them is not always easy. Voice pitch may help in identifying identical twins.
Area of Science:
- Phonetics
- Acoustic analysis
- Human perception
Background:
- Monzygotic twins (MT) are genetically identical.
- Visual discrimination between MT individuals is often difficult.
- The auditory similarity of MT voices is less understood.
Purpose of the Study:
- To investigate the perceptual similarity of monozygotic twin voices.
- To determine if listeners can distinguish between the voices of identical twins.
- To explore acoustic correlates of voice similarity in MT pairs.
Main Methods:
- Twenty female and 10 male monozygotic twin pairs provided voice samples.
- Participants listened to voice trios (two MT voices + one unrelated voice).
- Listeners identified twin pairs under two conditions: read sentences and sustained /a/ vowel.
Main Results:
- Correctly labeled twins were significantly above chance (33%) for both female (82% sentences, 63% /a/) and male voices (74% sentences, 52% /a/).
- Acoustic analysis showed high intra-twin correlation in speaking fundamental frequency (SFF) and fundamental frequency (F0).
- Voice pitch emerged as a potential factor in twin voice identification.
Conclusions:
- Voices of identical twins exhibit greater perceptual resemblance than unrelated voices.
- While listeners can identify identical twins by voice, the identification is not perfect.
- Voice pitch (fundamental frequency) may play a significant role in the accurate identification of monozygotic twins.