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Direct linkMcLeod, Kim; White, Victoria; Mullins, Robyn; Davey, Claire; Wakefield, Melanie; Hill, David – Journal of Genetic Psychology, 2008
The smoking behavior of friends is a major risk factor for adolescent smoking uptake. To explore the social context of smoking experimentation and consolidation with a particular focus on friends, the authors interviewed both members of 14 young adult identical twin pairs who were discordant for smoking. The different smoking status of twins was…
Descriptors: Twins, Smoking, Young Adults, Peer Groups
Peer reviewedHamilton, J. – Journal of Genetic Psychology, 1971
Descriptors: Psychological Testing, Test Results, Twins
Volbrecht, Michele M.; Lemery-Chalfant, Kathryn; Aksan, Nazan; Zahn-Waxler, Carolyn; Goldsmith, H. Hill – Journal of Genetic Psychology, 2007
Within a sample of 584 twins aged 12 to 25 months (292 pairs) studied longitudinally, positive affect measured through two laboratory pleasure episodes and maternal report at 12 and 22 months significantly predicted empathy-related helping and hypothesis testing assessed between 19 and 25 months. Girls showed significantly more concern than did…
Descriptors: Gender Differences, Parent Child Relationship, Genetics, Hypothesis Testing
Peer reviewedMurawski, Benjamin J. – Journal of Genetic Psychology, 1971
Descriptors: College Students, Genetics, Males, Perception Tests
Peer reviewedVan Den Daele, Leland D. – Journal of Genetic Psychology, 1974
The natal influences, and the inter- and intrapair intellectual differences of 16 sets of identical twins were evaluated in a retrospective study. (DP)
Descriptors: Behavior Development, Correlation, Individual Differences, Intelligence
Peer reviewedMatheny, Adam P., Jr.; And Others – Journal of Genetic Psychology, 1976
Summary scores for behaviors rated on Bayley's Infant Behavior Record were obtained by summing sequential ratings for same-sex twins participating in a longitudinal study. Composite scores were calculated for two behavioral clusters - one composed of behaviors related to primary cognitions and the other of behaviors related to extraversion.…
Descriptors: Cognitive Development, Heredity, Infant Behavior, Infants
Download full textVan den Daele, Leland D. – Journal of Genetic Psychology, 1972
A classification of natal influences is proposed with a model of their operation. Natal influences affect maternal capacity, maternal load, and maternal efficiency. Since maternal load is increased in twin pregnancy, results of twin studies must be generalized with caution. The method of co-twin control is exemplified by examination of a small…
Descriptors: Bibliographies, Genetics, Heredity, Individual Characteristics
Peer reviewedPeery, J. Craig; Stern, Daniel N. – Journal of Genetic Psychology, 1976
Gazing behavior of 10 twin infants (five male and five female) and their mothers were recorded weekly during the babies' fourth month of life. Videotape equipment was used in the home; data were gathered as naturalistically as possible. (Author/MS)
Descriptors: Infant Behavior, Infants, Interaction Process Analysis, Mothers
Kelly-Vance, Lisa; Anthis, Kristine S.; Needelman, Howard – Journal of Genetic Psychology, 2004
The use of assisted reproductive technology is increasing rapidly. Research, although sparse, has resulted in inconsistent findings as to the developmental prognosis for infants conceived by assisted reproductive techniques such as in vitro fertilization and the use of fertility drugs. In the present study, the authors compared twins who were…
Descriptors: Pregnancy, Technological Advancement, Appropriate Technology, Birth
