A Twin Study of Individual Differences in Perceptual Asymmetry

1999 ◽  
Vol 4 (3) ◽  
pp. 299-311
Author(s):  
Eve M. Valera ◽  
Wendy Heller ◽  
Howard Berenbaum
Keyword(s):  
Individual Differences ◽  
Twin Study ◽  
Perceptual Asymmetry

A Twin Study of Individual Differences in Perceptual Asymmetry

1999 ◽  
Vol 4 (3) ◽  
pp. 299-311 ◽  
Author(s):  
Eve M. Valera ◽  
Wendy Heller ◽  
Howard Berenbaum
Keyword(s):  
Individual Differences ◽  
Twin Study ◽  
Perceptual Asymmetry

scholarly journals Predicting individual differences in reading comprehension: a twin study

2010 ◽  
Vol 60 (2) ◽  
pp. 265-288 ◽  
Author(s):  
Nicole Harlaar ◽  
Laurie Cutting ◽  
Kirby Deater-Deckard ◽  
Laura S. DeThorne ◽  
Laura M. Justice ◽  
...  
Keyword(s):  
Reading Comprehension ◽  
Individual Differences ◽  
Twin Study

scholarly journals On the Etiology of Self-Enhancement and Its Association With Psychological Well-Being

2019 ◽  
Vol 11 (4) ◽  
pp. 435-445
Author(s):  
Yu L. L. Luo ◽  
Constantine Sedikides ◽  
Huajian Cai
Keyword(s):  
Individual Differences ◽  
Common Core ◽  
Twin Study ◽  
Well Being ◽  
Intermediate Level ◽  
The Self ◽  
Psychological Well Being ◽  
Subjective Level ◽  
Positive Light ◽  
Better Than

Self-enhancement, the motive to view oneself in positive light, and its manifestations have received wide attention in behavioral sciences. The self-enhancement manifestations vary on a continuum from a subjective level (agentic narcissism, communal narcissism, narcissistic grandiosity) through an intermediate level (better-than-average judgments) to an objective level (overclaiming one’s knowledge). Prior research has established the heritability of self-enhancement manifestations at the subjective and intermediate levels. The present twin study demonstrated that (1) the objective level of self-enhancement manifestation is also heritable; (2) a common core, which is moderately heritable, underlies the three levels of self-enhancement manifestations; (3) the relation between self-enhancement (manifested at all three levels) and psychological well-being is partly heritable; and (4) environmental influences, either shared by or unique to family members, are evident through (1), (2), and (3). The findings deepen understanding of the etiology of individual differences in self-enhancement and their links to psychological well-being.

scholarly journals Genetics of Cognition: Outline of a Collaborative Twin Study

Twin Research ◽  
2001 ◽  
Vol 4 (1) ◽  
pp. 48-56 ◽  
Author(s):  
Margie Wright ◽  
Eco De Geus ◽  
Juko Ando ◽  
Michelle Luciano ◽  
Danielle Posthuma ◽  
...  
Keyword(s):  
Working Memory ◽  
Individual Differences ◽  
The Netherlands ◽  
Cognitive Ability ◽  
Processing Speed ◽  
Twin Study ◽  
Memory Task ◽  
Inspection Time ◽  
Phenotypic Correlation ◽  
Spatial Span

AbstractAmultidisciplinary collaborative study examining cognition in a large sample of twins is outlined. A common experimental protocol and design is used in The Netherlands, Australia and Japan to measure cognitive ability using traditional IQ measures (i.e., psychometric IQ), processing speed (e.g., reaction time [RT] and inspection time [IT]), and working memory (e.g., spatial span, delayed response [DR] performance). The main aim is to investigate the genetic covariation among these cognitive phenotypes in order to use the correlated biological markers in future linkage and association analyses to detect quantitativetrait loci (QTLs). We outline the study and methodology, and report results from our preliminary analyses that examines the heritability of processing speed and working memory indices, and their phenotypic correlation with IQ. Heritability of Full Scale IQ was 87% in the Netherlands, 83% in Australia, and 71% in Japan. Heritability estimates for processing speed and working memory indices ranged from 33–64%. Associations of IQ with RT and IT (−0.28 to −0.36) replicated previous findings with those of higher cognitive ability showing faster speed of processing. Similarly, significant correlations were indicated between IQ and the spatial span working memory task (storage [0.31], executive processing [0.37]) and the DR working memory task (0.25), with those of higher cognitive ability showing better memory performance. These analyses establish the heritability of the processing speed and working memory measures to be used in our collaborative twin study of cognition, and support the findings that individual differences in processing speed and working memory may underlie individual differences in psychometric IQ.

scholarly journals Individual Differences in Ownership Reasoning: A Twin Study

2016 ◽  
Vol 101 ◽  
pp. 478
Author(s):  
C. Forchuk ◽  
O. Friedman ◽  
P.A. Vernon
Keyword(s):  
Individual Differences ◽  
Twin Study

scholarly journals Genetic and Environmental Influences on Individual Differences in Attitudes Toward Homosexuality: An Australian Twin Study

2008 ◽  
Vol 38 (3) ◽  
pp. 257-265 ◽  
Author(s):  
Karin J. H. Verweij ◽  
Sri N. Shekar ◽  
Brendan P. Zietsch ◽  
Lindon J. Eaves ◽  
J. Michael Bailey ◽  
...  
Keyword(s):  
Individual Differences ◽  
Twin Study ◽  
Environmental Influences ◽  
Attitudes Toward Homosexuality
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