The origins of individual differences in memory among the elderly: A behavior genetic analysis.

This replication study examines relations between alexithymia and trait emotional intelligence (trait EI) at the phenotypic, genetic, and environmental levels. A sample of 1,444 same-sex twin pairs (850 MZ pairs and 594 DZ pairs) completed the Toronto Alexithymia Scale-20. A subset of 494 same-sex twin pairs (287 MZ pairs and 207 DZ pairs) had earlier completed the Trait Emotional Intelligence Questionnaire. Individual differences in alexithymia were attributable to genetic, non-shared environmental, and shared environmental factors. All but one of the facets of alexithymia were negatively and significantly correlated with the factors of trait EI, and these phenotypic correlations were entirely attributable to correlated genetic and correlated non-shared environmental factors. These bivariate results provide a valuable replication of those of Baughman et al. (Twin Research and Human Genetics, Vol. 14, 2011, pp. 539–543), which was conducted with substantially smaller samples of twins.

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Behavior-genetic analysis of Phormia regina: conditioning, reliable individual differences, and selection.

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.74.11.5193 ◽

1977 ◽

Vol 74 (11) ◽

pp. 5193-5197 ◽

Cited By ~ 73

Author(s):

T. R. McGuire ◽

J. Hirsch

Keyword(s):

Individual Differences ◽

Genetic Analysis ◽

Behavior Genetic ◽

Phormia Regina

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Maternal Effects in Behavior Genetic Analysis

Neurobehavioral Genetics ◽

10.1201/9780849333644.ch14 ◽

1999 ◽

Author(s):

Michèle Carlier ◽

Pierre Roubertoux ◽

Douglas Wahlsten

Keyword(s):

Genetic Analysis ◽

Maternal Effects ◽

Behavior Genetic

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Lonely people tend to make fun of themselves: A behavior genetic analysis of humor styles and loneliness

Personality and Individual Differences ◽

10.1016/j.paid.2017.05.042 ◽

2017 ◽

Vol 117 ◽

pp. 71-73 ◽

Cited By ~ 9

Author(s):

Julie Aitken Schermer ◽

Rod A. Martin ◽

Philip A. Vernon ◽

Nicholas G. Martin ◽

Lucía Colodro Conde ◽

...

Keyword(s):

Genetic Analysis ◽

Behavior Genetic ◽

Humor Styles

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Longitudinal Genetic Analysis for Loneliness in Dutch Twins

Twin Research and Human Genetics ◽

10.1375/twin.10.2.267 ◽

2007 ◽

Vol 10 (2) ◽

pp. 267-273 ◽

Cited By ~ 29

Author(s):

Dorret I. Boomsma ◽

John T. Cacioppo ◽

Bengt Muthén ◽

Tihomir Asparouhov ◽

Shaunna Clark

Keyword(s):

Individual Differences ◽

Genetic Analysis ◽

Heritability Estimate ◽

The Other ◽

Twin Data ◽

Linear Quadratic ◽

Time Points ◽

Longitudinal Growth Modeling ◽

Dutch Twins ◽

Over Time

AbstractIn previous studies we obtained evidence that variation in loneliness has a genetic component. Based on adult twin data, the heritability estimate for loneliness, which was assessed as an ordinal trait, was 48%. These analyses were done on loneliness scores averaged over items (‘I feel lonely’ and ‘Nobody loves me’) and over time points. In this article we present a longitudinal analysis of loneliness data assessed in 5 surveys (1991 through 2002) in Dutch twins (N = 8389) for the two separate items of the loneliness scale. From the longitudinal growth modeling it was found sufficient to have non-zero variance for the intercept only, while the other effects (linear, quadratic and cubic slope) had zero variance. For the item ‘I feel lonely’ we observed an increasing age trend up to age 30, followed by a decline to age 50. Heritability for individual differences in the intercept was estimated at 77%. For the item ‘Nobody loves me’ no significant trend over age was seen; the heritability of the intercept was estimated at 70%.

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Validating time-sampled observations of courtship inDrosophila melanogaster for behavior genetic analysis

Behavior Genetics ◽

10.1007/bf01071930 ◽

1985 ◽

Vol 15 (1) ◽

pp. 31-41 ◽

Cited By ~ 6

Author(s):

Mike F. Collins ◽

John K. Hewitt ◽

John F. Gogarty

Keyword(s):

Genetic Analysis ◽

Behavior Genetic

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Individual Differences in Stimulus Intensity Modulation in the Elderly

The International Journal of Aging and Human Development ◽

10.2190/2h0c-t8fe-qf6c-2wle ◽

1981 ◽

Vol 13 (4) ◽

pp. 285-295 ◽

Cited By ~ 7

Author(s):

Brian L. Mishara ◽

A. Harvey Baker

Keyword(s):

Individual Differences ◽

Stimulus Intensity ◽

Social Engagement ◽

Multivariate Analyses ◽

The Elderly ◽

Intensity Modulation ◽

Self Report ◽

Future Planning ◽

Personality Dimension ◽

Attitudes Toward Death

The validity of the postulated perceptual style-personality dimension of modulation (augmenting vs. reducing) of stimulus intensity previously studied with young adults was examined in two elderly samples. It was hypothesized that in the elderly Stimulus Intensity Modulation (SIM) relates to degree of social engagement (assessed both behaviorally and by self-report), perceived life difficulty, attitudes toward death, and three previously validated behaviors (desired and obtained amount of sleep, future planning, and smoking). The Kinesthetic Aftereffect (KAE) task was used as the measure of SIM. Results from multivariate analyses of variance indicated a significant relationship between KAE and the validity variables. Additional correlational analyses indicate that there is a linear relationship between KAE and each of the domains, except attitudes toward death. Results from both studies are consistent with the views that KAE indexes the postulated SIM dimension and that the SIM approach can be applied fruitfully to the study of individual differences in the elderly.

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