title: Person-Specific Non-shared Environmental Influences in Intra-individual Variability: A Preliminary Case of Daily School Feelings in Monozygotic Twins.
abstract: Most behavioural genetic studies focus on genetic and environmental influences on inter-individual phenotypic differences at the population level. The growing collection of intensive longitudinal data in social and behavioural science offers a unique opportunity to examine genetic and environmental influences on intra-individual phenotypic variability at the individual level. The current study introduces a novel idiographic approach and one novel method to investigate genetic and environmental influences on intra-individual variability by a simple empirical demonstration. Person-specific non-shared environmental influences on intra-individual variability of daily school feelings were estimated using time series data from twenty-one pairs of monozygotic twins (age = 10 years, 16 female pairs) over two consecutive weeks. Results showed substantial inter-individual heterogeneity in person-specific non-shared environmental influences. The current study represents a first step in investigating environmental influences on intra-individual variability with an idiographic approach, and provides implications for future behavioural genetic studies to examine developmental processes from a microscopic angle.
authors.affiliation: Department of Psychology, Simon Fraser University, RCB 5246, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada. yza296@sfu.ca.|Child and Family Research Institute, Vancouver, BC, Canada. yza296@sfu.ca.
authors.forename: Yao
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: Human Development and Family Studies, The Pennsylvania State University, University Park, PA, USA.
authors.forename: Peter C M
authors.initials: PCM
authors.lastname: Molenaar
authors.affiliation: Centre for Philosophy of Natural and Social Science, London School of Economics, London, UK.
authors.forename: Rosalind
authors.initials: R
authors.lastname: Arden
authors.affiliation: Department of Education, Psychology in Education Research Centre, University of York, York, UK.
authors.forename: Kathryn
authors.initials: K
authors.lastname: Asbury
authors.affiliation: Human Development and Family Studies, The Pennsylvania State University, University Park, PA, USA.
authors.forename: David M
authors.initials: DM
authors.lastname: Almeida
mesh_terms: D002648:Child; D004644:Emotions; D005260:Female; D006801:Humans; D008962:Models, Theoretical; D012574:Schools; D012931:Social Environment; D014430:Twins, Monozygotic / Q000523:psychology*
keywords: Daily diary data; Developmental processes; Idiographic approach; Intra-individual variability; Non-shared environmental influences; Person-specific