A zygosity questionnaire for young twins: a research note.
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Biomedical subjects
Publications and source records attributed to H H Goldsmith.
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In prior research we have shown how linear structural equation models and computer programs (e.g., LISREL) may be simply and directly used to provide alternatives for the traditional biometric twin design. We use structural equations and path models to define biometric group differences, we write traditional common-factor models in the same way, and then we take a detailed look at some alternative multivariate and biometric models. We contrast the biometric-factors covariance structure approach used by Loehlin and Vandenberg (1968), Martin and Eaves (1977), and others with the psychometric-factors approach used by McArdle et al. (1980) and others. We use the multivariate primary mental abilities data on monozygotic (MZ) and dizygotic (DZ) twins from Loehlin and Vandenberg (1968) to detail fundamental differences in model specification and results. We extend both multivariate biometric approaches using exploratory and confirmatory multiple-factor models. These comparisons show that each alternative multivariate methodology has useful features for empirical applications.
Despite the prominence of temperament constructs in the study of infant development, little evidence exists about the internal structure of temperament. We assessed temperament both via questionnaire and in repeated laboratory visits for 168 9-month-old twins and singletons. Mothers' and fathers' agreement on temperament questionnaire scales was low, except for scales tapping negative emotionality and activity level. The factor structure of mothers' and fathers' questionnaire scales also differed, with fathers tending to associate higher motoric activity with hedonically positive behaviors. We measured fearfulness during 2 visual cliff episodes and a stranger approach, and we measured joy/pleasure during a series of 4 games. For both fearfulness and pleasure we found moderate cross-situation generality, short-term stability, and convergence with specific temperament questionnaire scales. Parameters of response, such as latency, duration, and intensity, intercorrelated within--but not across--response types. Fearful distress and avoidance proved to be uncorrelated. The results suggest that the component behaviors of infant fearfulness and pleasure are structured in a fashion consistent with a temperamental interpretation.
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4 current approaches to understanding temperament are discussed in the roundtable. In an introductory overview, Goldsmith outlines some of the major convergences and divergences in the understanding of this concept. Theorists representing 4 positions--Goldsmith, Buss and Plomin, Rothbart, and Thomas and Chess--outline their views by responding to each of 6 questions: How do you define temperament and explain the boundaries of the concept? What are the elements of temperatment? How does the construct of temperament permit you to approach issues or organize data in ways that are possible only if this construct is invoked? How does temperament develop? To what extent do you consider temperament to be a personological versus a relational or an interactional construct? and How does your approach deal with issues of temperamental "difficulty"? In 2 commentaries on the theorists' answers, Hinde highlights differences among their positions and indicates issues that current theories of temperament must take into consideration, and McCall draws on common aspects to propose a synthesizing definition that draws on all 4 approaches.
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The frequency of mental retardation in the offspring of maternal aunts of retarded probands is compared with the frequency in offspring of other aunts or uncles of the same probands. There is no support for inherited uterine inadequacy as an explanatory factor for mental retardation.