Physiological Self-Regulation Buffers the Relationship between Impulsivity and Externalizing Behaviors among Nonclinical Adolescents

Trait impulsivity is a risk factor for rule breaking and aggressive (externalizing) behaviors among nonclinical youth. Buffers of trait-based risk are of practical interest to preventing externalizing behaviors. One such buffer may be the capacity and efforts of a child to self-regulate their physiology. Youth who possess baseline physiological self-regulatory capacities are more likely to maintain adaptive engagement with their environment and may be less prone to impulsively rule break or be aggressive. Similarly, youth who are able to use self-regulatory skills to calm their physiology in times of stress may be less likely to externalize distress. This study examined self-regulatory capacity and efforts as a moderator of the relationship between trait impulsivity and externalizing behaviors, cross-sectionally and prospectively. We hypothesized that the effect of trait impulsivity on externalizing behaviors would depend on the presence of baseline self-regulatory capacity and/or self-regulatory efforts during stress. Participants were 134 nonclinical adolescents (M_age?=?12.59, SD?=?1.20 51.9% female, 71% Caucasian). Trait impulsivity was measured using a parental report questionnaire. Physiological self-regulatory capacity and efforts were measured through collection of electrocardiogram data during a resting baseline and a stressful, unsolvable anagram task, respectively. Physiological self-regulation was quantified by calculating respiratory sinus arrhythmia scores across baseline and stress tasks. Respiratory sinus arrhythmia is the change in heart rate across the breathing cycle, and is hypothesized to index physiological self-regulation capacity and efforts under specific conditions. The results indicated that physiological self-regulation capacity, but not efforts, moderated the effect of trait impulsivity on externalizing behaviors prospectively. Stronger physiological self-regulatory capacity buffered the effect of greater trait impulsivity. Implications of these findings among typically developing youth are discussed.     

The role of variations in growth rate and sample collection on interpreting results of segmental analyses of hair

Segmental analysis of hair for drugs, metabolites, and poisons has been widely reported in the scientific literature over the past two decades. Two fundamental assumptions in interpreting results of such analyses are (1) an average linear growth rate of head hair of 1cm/month and (2) that sample collections occur with the hair being cut directly next to the scalp. The purpose of this study was to evaluate the variability associated with growth rate of human head hair, as well as the ability to uniformly collect hair next to the scalp. The results were used to determine how these factors affect the interpretation of results generated in segmental analysis of hair. A thorough literature review was conducted to assess the range of linear growth of human head hair from the vertex posterior and occipital regions. The results were compiled to establish the average (1.06cm/month), as well as the range of possible growth rates of head hair. The range was remarkable and suggests that conclusions based on the 1-cm/month growth rate could be significantly skewed. A separate study was undertaken to evaluate collection of hair next to the scalp. Fourteen individuals were provided oral instructions, as well as a written standard collection procedure for head hair. The experience levels among the collectors varied from novice to expert. Each individual collected hair from dolls with short- and long-hair. Immediately following each collection, the sampling area was evaluated to determine how close to the scalp the cuts were made, as well as the variability in the lengths of hair remaining at the sampled area. From our collection study, we determined that 0.8±0.1cm of hair was left on the scalp after cutting. When taking into account the amount of hair left on the scalp after collecting, the use of a growth rate of 1.06cm/month, and the assumption that it takes two weeks for newly formed hair in the follicle to reach the scalp, we find that the first 1-cm segment of hair typically corresponds to hair formed 1.3±0.2 to 2.2±0.4 months (95% confidence) earlier. The impact of these findings as it relates to the corresponding time for each additional segment is demonstrated. As a result, we recommend that hair collection be delayed 8 weeks after a suspected ingestion to ensure that the sample fully represents the exposure period. The results of this study suggest that the variability in the growth rate of human head hair, as well as the inconsistent collection of hair, significantly affect the interpretation of results from segmental analysis of hair.     

The effects of tougher enforcement on the job prospects of recent Latin American immigrants

Attempts to enforce immigration laws in the U.S. interior have proliferated in recent years, yet the effects of these laws on immigrants are largely unknown. This paper examines whether increases in immigration‐related law enforcement since 2001 have adversely affected the labor market outcomes of low‐education male immigrants from Latin America, a group that comprises the bulk of undocumented workers in the U.S. The crackdown on the use of fraudulent Social Security numbers, increased requirements for government‐issued identification, and other changes associated with greater focus on national security likely lowered the demand for undocumented foreign‐born workers in the years following the 9/11 terrorist attacks. Using Current Population Survey data and a difference‐in‐differences estimation technique, we find strong evidence of worse labor market outcomes among recent Latin American immigrants in the post‐9/11 period relative to natives and prior Latin American immigrants. The results indicate a decline in employment, hours worked, and earnings among recent male Latin American immigrants relative to similarly low‐skilled black and Hispanic natives and vis‐à‐vis Latin American immigrants who have been in the U.S. longer. Our findings are consistent with firms increasingly substituting legal workers for undocumented labor in the years following 9/11. © 2009 by the Association for Public Policy Analysis and Management.     

A Meta-Analytic Review of Pretrial Research: Risk Assessment,Bond Type,and Interventions

This study makes an attempt to aggregate what we currently know about pretrial decision making and jurisdictions’ responses to the pretrial population. This meta-analysis began with an exhaustive search for pretrial research which may have revealed the most prominent finding—that being a distinct lack of research that utilizes any amount of methodological rigor. The findings of this meta-analysis hold several policy implications for the field of pretrial research and practice. First, future research studies in the field of pretrial need to focus on methodological quality and rigor. Second, it appears that some conditions of release may be related to a defendant’s likelihood of failure to appear. Third, it appears that none of the conditions of release reviewed in this study are related to a defendant’s likelihood of re-arrest while on pretrial release. Finally, it is recommended that the field of pretrial develop a sound research agenda and execute that plan with rigor, transparency, and an approach that favors the continued cumulation of knowledge. Strong conclusions about the impact of pretrial release conditions cannot be made as the quality of the pretrial research, overall, is weak at best.     

The Relationship between Homelessness and Behavior Problems among Youth in North Texas: a Brief Report

This study sought to examine the relationship between homelessness and behavior problems among a community-based sample of youth in North Texas. Data were obtained from a cross-sectional, probability sample of households and a targeted sample of homeless families in Dallas, Texas, with children older than 5 years old (N?=?5232). Parents were asked to report five behavior problems on behalf of their children including arrest or trouble with police, academic problems, behavior problems at school, suspension, and suicide attempts. Logistic and negative binomial regression procedures were used to examine the relationship between homelessness and behavior problems. Youth exposed to homelessness were 36% (OR?=?1.63; 95% CI 1.00–1.85) more likely to exhibit any kind of behavior problems than youth who had never experienced homelessness. Homeless youth had 5.51 times the odds of arrest (95% CI 2.60–11.68), 1.74 times the odds of academic problems (95% CI 1.24–2.43), and more than 3 times the odds of suicide attempts (95% CI 1.46, 7.61) than youth who had never been homeless. Homelessness was associated with higher rates of problem behavior, including arrests, academic problems, and suicide attempts. Because homeless youth are commonly enrolled in school and present at health care clinics and emergency departments, clinics and schools may aid in the identification of homeless youth, as well as referral to care. In this way, clinicians may help reduce the burden of behavioral problems that disproportionately affect homeless youth.