Recent research investigating social risk factors of depression has found evidence for a social contagion effect. The research comes from a surge in popularity of using social network analyses to examine the spread of various health outcomes such as obesity, smoking, substance use, and sleep. Although the finding of depressive contagion represents a significant contribution to the literature on the social etiology of depression, this is only the first step in providing meaningful research useful for the practical application of curbing the growing rates of depression especially among adolescents. Rather than simply acknowledging the existence of contagion effects, researchers must begin to answer the question of whether certain individuals or environments are more susceptible to the effects of depressive contagion. As a result, this dissertation applies a differential susceptibility model to examine three moderators of depressive contagion: social network structure, racial/ethnic identity, and genotypic variation in the serotonin transporter (SLC6A4) gene. The research in this dissertation uses data from the National Longitudinal Study of Adolescent Health (Add Health).
First, the results reveal that adolescents who are popular and/or embedded in dense peer networks are more susceptible to depressive contagion. Additionally, depressive contagion is more salient in schools characterized by dense social networks and high reciprocity in social ties. Second, racial homophily plays an important role in the effect of depressive contagion. Adolescents embedded in racially homophilous peer networks are more susceptible to depressive contagion. Further analysis shows that this effect applies primarily for Asians and Hispanics. Finally, results indicate a significant gene-environment interaction (GxE) effect between a polymorphism in the serotonin transporter system (5-HTTLPR) and depressive contagion. Adolescents carrying one or two short alleles in the 5-HTTLPR are more susceptible to depressive contagion.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-04052016-173428 |
| Date | 04 May 2016 |
| Creators | Guan, Win |
| Contributors | Blanchard, Troy C., Stroope, Samuel, Rackin, Heather M., Kamo, Yoshinori, DiCarlo, Cynthia F. |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-04052016-173428/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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