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HERITABILITY AND LONGITUDINAL STABILITY OF IMPULSIVITY IN
ADOLESCENCE
by
Sharon Hava Niv
A Thesis Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
MASTER OF ARTS
(PSYCHOLOGY)
August 2010
Copyright 2010 Sharon Hava Niv
Object Description
| Title | Heritability and longitudinal stability of impulsivity in adolescence |
| Author | Niv, Sharon Hava |
| Author email | sniv@usc.edu; sharon.niv@gmail.com |
| Degree | Master of Arts |
| Document type | Thesis |
| Degree program | Psychological Sciences |
| School | College of Letters, Arts and Sciences |
| Date defended/completed | 2010-03-05 |
| Date submitted | 2010 |
| Restricted until | Unrestricted |
| Date published | 2010-07-30 |
| Advisor (committee chair) | Baker, Laura A. |
| Advisor (committee member) |
Bechara, Antoine Prescott, Carol A. |
| Abstract | Impulsivity is a personality dimension closely related to many psychopathological states, and which is not fully understood in adolescents. This study investigated the genetic and environmental contributions to impulsive traits in a community sample of adolescent twins; data was collected in two waves when the twins were at ages 11-13 and 14-15 years. The study utilized the Barratt Impulsiveness Scale, adolescent version (BIS), which yields three subscales (inattention, motor and non-planning impulsivities). Univariate genetic analyses for the three subscales yielded moderate heritability estimates of 38-55% at ages 11-13 and 31-37% at ages 14-15. Multivariate analyses performed at each wave suggested a latent common impulsivity factor through which common genetic and environmental factors influence each subscale, with additional specific genetic and environmental influences contributing to each subscale individually. Phenotypic correlations across waves for each subscale ranged from r = 0.24 to 0.39; the correlation between the two latent impulsivity factors was r = 0.47, 72% of which was attributable to stability of genetic effects. These results suggest significant genetic influences to impulsivity across the span of adolescence, with moderate stability of traits between the ages of 11-15. In spite of the significant genetic stability in the latent impulsivity factor, new genetic and environmental contributions to impulsivity arose in the second wave of data collection, and mean levels changed across waves for all three subscales, suggesting changes in impulsive traits and their etiologies during the adolescent years. |
| Keyword | adolescence; behavioral genetics; impulsivity; twins |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m3234 |
| Rights | Niv, Sharon Hava |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Niv-3797 |
| Archival file | uscthesesreloadpub_Volume14/etd-Niv-3797.pdf |
Description
| Title | Page 1 |
| Full text | HERITABILITY AND LONGITUDINAL STABILITY OF IMPULSIVITY IN ADOLESCENCE by Sharon Hava Niv A Thesis Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree MASTER OF ARTS (PSYCHOLOGY) August 2010 Copyright 2010 Sharon Hava Niv |
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