Melbourne Conservatorium of Music - Theses
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ItemThe genetic basis of singing ability: a twin study( 2016)Music is a human universal, an integral part of all known human culture. While most people possess the capacity for music perception and production, individual differences in various forms of music abilities are evident in the general population. The diversity in abilities has sparked intense debates regarding the relative importance of nature and nurture in shaping music ability. While in recent years, researchers have begun to explore the genetic basis of music perception abilities, the interrogation of the genetic basis of music production abilities has been relatively scarce. Singing is an ideal paradigm for investigating the genetic basis of music ability; it is a universal, multifaceted music ability that is spontaneously emergent and shaped by formal and informal music learning environments. The present study therefore employed a twin study design to investigate the genetic basis of singing ability and estimate the relative contribution of genetic and environmental factors influencing singing ability using a comprehensive set of singing tasks and measures. The study also aimed to identify environmental factors associated with singing ability and examine whether these factors have a genetic component, and whether shared genetic influences might explain the association between singing ability and these factors. The twin study was conducted online using a purpose-built online program Let’s Hear Twins Sing, which enabled twins to participate regardless of their geographical location. The 30 minutes online twin study comprised three singing tasks (vocal pitch-matching, singing a familiar song, and melody imitation), two music perception tasks and a questionnaire on music and singing background. The study took approximately 30 minutes to complete and the study data were captured online in real-time and saved on a server for subsequent analyses. The final sample consisted of 70 monozygotic (55 female; 15 male) and 38 dizygotic (24 female; 7 male; 7 male-female) twin pairs (mean age = 32.4 years), the majority were recruited through the Australian Twin Registry. Univariate genetic modelling revealed that both the objectively-assessed singing ability across all tasks and self-rated singing ability had similarly significant and substantial genetic components (A = 69-72%). Additive genetic influences also contributed significantly to the variation observed in various singing task measures, with moderate to large heritabilities (A = 44-71%), negligible to moderate common environmental (C = 0-37%) and moderate unique environmental (E = 19-40%) influences. Significant moderate to large genetic components were also estimated for environmental variables associated with singing ability: instrumental expertise (A = 68%), years of music training (A = 46%), and public singing engagement (A = 66%). Bivariate genetic analyses revealed that the associations between singing ability and both instrumental expertise and years of music training were mediated significantly by shared additive genetic influences. The novel findings therefore provided preliminary evidence for the role of genes in influencing singing ability and formal music training, as well as a partially shared genetic basis for singing ability and music training. The promising results establish a valuable background that encourages further behavioural and molecular genetic interrogations into the genetic bases of various types of music abilities.