Sneha Thamotharan

The relationship between stress and delay discounting: a meta-analytic review.

The objective of the present meta-analytic review was two-fold: (a) to address the mixed findings of previous research by determining the relationship between stress and impulsivity; and (b) to examine age differences in this relationship. A total of 16 articles fulfilled the inclusion criteria for the present meta-analysis for a total sample size of 2189 participants (k=22) ranging in age from 36 months to 71 years. Using the statistical software, Comprehensive Meta-Analysis, Version 2.0 – Hedges’s g was computed to estimate the effect size. Results showed that impulsivity was related to stress with a moderate–large effect size (g=0.590). Significant moderating effects were found for the type of stress measure (g=0.592) and the type of discounting measure (g=0.696) used. The current study emphasizes the need for further research on the relationship between stress and discounting as additional findings may aid in improving future prevention and intervention programs for health-risk behaviors.

The relationship between weight and smoking in a national sample of adolescents: Role of gender.

This study sought to investigate the role of weight status and body mass index percentile in risky smoking behaviors in male and female adolescents. Analyses of the data obtained in the 2011 Youth Risk Behavior Surveillance System were conducted. The national sample size included 15,425 adolescents. Questions addressing weight status and smoking behaviors were used in analyses. Significant effects of perceived weight status, weight change status, and body mass index percentile on smoking behaviors were found for both genders. The current findings indicate the importance of accounting for both gender and weight status when developing prevention and cessation programs targeting smoking behaviors.

An examination of sexual risk behaviors in adolescent substance users

ABSTRACT. Objectives: This study examined the risk for engaging in high-risk sexual behavior associated with substance use in a sample of U.S. adolescents. Methods: The sample (N = 15,425) was obtained via the Youth Risk Behavior Surveillance System, a survey of public high school students. Results: Substance use was associated with sexual risk behaviors, with odds ratios being greatest for adolescents who used cigarettes and illicit substances, as well as those who engaged in injection drug use. Conclusions: Results highlight the need for prevention and intervention programs targeting sexual risk behaviors in substance-using adolescents as a means to decrease the spread of sexually transmitted infections.

Examining weight concern and delay discounting in adolescent females.

OBJECTIVE Pediatric obesity is a growing public health concern that contributes to high rates of negative long-term physical and mental health outcomes. Research focused on identifying risk for pediatric obesity has linked delay discounting, or an inclination for immediate rewards, as well as weight concern to individuals with greater Body Mass Index (BMI). The current study seeks to fill a void in the literature by examining how these two variables interact to promote higher BMI in female adolescents. METHOD Adolescent (n=60) females between the ages of 13-19years (mage=17.45, SD=1.74) of age completed the Eating Disorder Examination Questionnaire (EDE-Q) and the Delay Discounting Questionnaire. RESULTS A mediation model examined whether delay discounting accounted for the relationship between weight concern and BMI. Results indicate that in the current study weight concern was negatively related to delay discounting and delay discounting was negatively related to BMI. The overall model revealed that a partial mediation occurred [b=1.28, t(60)=4.92, p<0.01]. DISCUSSION These results suggest that while impulsivity is an important factor to consider, other constructs may also be influential in how weight concerns contribute to greater BMI. Nevertheless, the results indicate that prevention and interventions should identify females with high levels of both weight concern and impulsivity as an increased risk for experiencing pediatric obesity and long-term negative health outcomes.

Delay discounting, but not disinhibition or inattention, partially mediates the effects of neuroticism on disordered eating in adolescents

Adolescence represents an integral developmental period for the prevention and intervention of disordered eating. Individuals with high levels of neuroticism have been shown to respond with greater impulsivity and use of disordered eating as a coping mechanism. However, the exact mechanism through which neuroticism and impulsivity affect disordered eating remains unknown. To understand the effects of personality and impulsivity on disordered eating in adolescence, the present study aimed to investigate whether impulsivity mediated the relationship between neuroticism and disordered eating. Adolescents (N=40) between the ages of 13 and 19 (Mage=18.25years; S.D.=1.30) were queried on eating attitudes and personality, as well as completed behavioral tasks assessing impulsivity (delay discounting, disinhibition and inattention). Mediation analyses revealed that neuroticism was significantly associated with patterns of disordered eating, but delay discounting, and not disinhibition and inattention, appeared to mediate the relationship between neuroticism and disordered eating. These results should guide prospective research exploring the relations between neurotic and impulsive behavior, particularly delay discounting on disordered eating, which will assist in future treatment efforts targeting the development of maladaptive eating behaviors.

Effects of weight and gender on a task of inattention.

OBJECTIVE Previous studies have established that obese adolescents possess a stronger tendency to behave more impulsively and be more inattentive than healthy-weight children. Additionally, gender difference in inattention and impulsivity has also been substantiated by previous researchers. The current study examined the relationship between gender, body weight, and inattention and impulsivity in adolescents. It was hypothesized that obese males and females would have more inattentive and impulsive responses than their healthy-weight peers. METHOD Participants were 113 adolescents between the ages of 14 and 19; all participants completed the CPT-II, a measure of inattentive and impulsive response styles. RESULTS Findings indicated that males who were classified as overweight or obese scored higher on inattention than did obese females, healthy-weight males, and healthy-weight females. Additionally, females committed a greater number of commission errors and were less able to distinguish the target stimuli, suggestive of impulsive responding. CONCLUSION These findings indicate a gender difference in regard to impulsive responding, and also reveal an interaction of weight status and gender on inattention. Implications for prevention and treatment are discussed.

Drug Use Status in Youth: The Role of Gender and Delay Discounting

ABSTRACT Background: Evidence from gender and delay discounting studies suggests these variables may influence drug use in youth. However, no studies to date have examined sexual discounting with regard to drug use in youth. Objectives: The present study examined gender and delay discounting, both monetary and sexual, with regard to the drug use status of alcohol, tobacco, and marijuana. Methods: Youth aged 14–21 years (n = 155) provided demographic and drug use information and completed behavioral tasks assessing monetary and sexual discounting in a single laboratory session. Chi-square and analysis of variance were used to assess group differences. Results: Across drug use status, differences in gender and sexual discounting but not monetary discounting were found. Moderate drinkers and smokers were more likely to be male and displayed steeper sexual discounting rates. However, no interaction effect between gender and discounting differences on drug use status was observed. Conclusions: Findings suggest that drug use may manifest differently by gender and highlight the domain specificity of sexual discounting. These findings further highlight the need to incorporate gender and domain-specific discounting measures when investigating drug use pathology and interventions in youth.