The Isolation of Motivational, Motoric, and Schedule Effects on Operant Performance: A Modeling Approach

Dissociating motoric and motivational effects of pharmacological manipulations on operant behavior is a substantial challenge. To address this problem, we applied a response‐bout analysis to data from rats trained to lever press for sucrose on variable‐interval (VI) schedules of reinforcement. Motoric, motivational, and schedule factors (effort requirement, deprivation level, and schedule requirements, respectively) were manipulated. Bout analysis found that interresponse times (IRTs) were described by a mixture of two exponential distributions, one characterizing IRTs within response bouts, another characterizing intervals between bouts. Increasing effort requirement lengthened the shortest IRT (the refractory period between responses). Adding a ratio requirement increased the length and density of response bouts. Both manipulations also decreased the bout‐initiation rate. In contrast, food deprivation only increased the bout‐initiation rate. Changes in the distribution of IRTs over time showed that responses during extinction were also emitted in bouts, and that the decrease in response rate was primarily due to progressively longer intervals between bouts. Taken together, these results suggest that changes in the refractory period indicate motoric effects, whereas selective alterations in bout initiation rate indicate incentive‐motivational effects. These findings support the use of response‐bout analyses to identify the influence of pharmacological manipulations on processes underlying operant performance.     

Relationship Characteristics Associated with Teen Dating Violence Perpetration

Teen dating violence (TDV) is unstable across dating relationships, suggesting that characteristics of the relationship could be related to TDV. Few empirical studies have examined these links. This study examined associations between relationship characteristics and TDV perpetration among teens and sex differences in those associations. Relationship characteristics examined include tactics used to manipulate partners, ways of responding to relationship problems, relationship duration, exclusivity of the relationship, age difference between partners, and history of sexual intercourse with partner. Data were drawn from 667 teens in a current relationship (62.5% female and 81.4% White) enrolled in the 11th or 12th grade in 14 public schools in a rural U.S. state. Bivariate and multivariable regression analyses examined proposed associations. A total of 30.1% and 8.2% of teens reported controlling and physical TDV perpetration, respectively. In multivariable models, frequent use of manipulation tactics increased risk for controlling or physical TDV perpetration. Teens dating a partner 2 or more years younger were at significantly increased risk for both controlling and physical perpetration. A significant interaction emerged between sex and exit or neglect accommodation for physical TDV. Characteristics of a current dating relationship play an important role in determining risk for controlling and physical TDV perpetration.     

Use of Psychotropic Medications Among Youth in Treatment Foster Care

We describe the use of psychotropic medications among youth in treatment foster care (TFC). Data from 240 youth were coded to examine rates of medication use, including polypharmacy and an indicator of “questionable polypharmacy.” Fifty-nine percent of youth in TFC had taken a psychotropic medication within the past 2 months. Of the youth taking psychotropics, 61 % took two or more and 22 % met criteria for questionable polypharmacy. The majority of youth taking psychotropics also received psychosocial mental health services and were more likely to receive such services than youth not taking medication. Use of psychotropic medication use was not significantly related to demographic factors, maltreatment history, or custody. However, youth with more severe symptoms were more likely to be on medications and to be on multiple medications. Youth with “questionable polypharmacy” were less likely than other youth on multiple medications to have a recent visit to a psychiatrist.     

Moving Forward with Systems of Care: Needs and New Directions

The articles in this Special Issue on system change within systems of care (SOCs) provide guidance regarding strategies for modifying SOCs to address the needs of different populations, and ways for changing systems to support more positive child and family outcomes. This paper frames central needs, unanswered questions, and issues that remain for those working to implement SOCs. Specific needs and new directions considered include: (1) rigorous implementation-focused research to identify the necessary and sufficient elements of SOCs and the primary practice approach currently used in SOCs, wraparound; (2) applied research to assess SOCs and document their effectiveness in non-standard or non-traditional settings (i.e., non-mental health settings, including child welfare, juvenile justice, local housing authorities); (3) controlled outcome studies for school-based wraparound initiatives; (4) research to document the effectiveness of the family support efforts that are part of most SOCs; and (5) attention to context, for families, service providers, and collaborative implementation efforts, by researchers and providers alike. Progress in these areas can inform well-targeted system change efforts in the context of SOCs, a critical need given changes in federal funding for these initiatives.     

The Interaction Effects of Leader and Follower Conscientiousness on Person-Supervisor Fit Perceptions and Follower Outcomes: A Cross-Level Moderated Indirect Effects Model

ABSTRACT

The primary purpose of this study is to examine how the cross-level interaction between leader and follower conscientiousness influences person-supervisor (PS) fit perceptions, which in turn impact follower work attitudes and organizational citizenship behavior (OCB). Based on a sample of 1,204 participants in 167 work teams, the results of our cross-level moderated indirect effects model show that highly conscientiousness followers whose leaders also have high levels of conscientiousness experience enhanced perceptions of PS fit which result in higher levels of job satisfaction and OCB and lower levels of intention to quit. The study suggests that high leader conscientiousness serves as a supportive situational cue that motivates followers to more fully express their conscientiousness and act in ways consistent with their conscientiousness.     

Understanding risk for psychopathology through imaging gene-environment interactions

Examining the interplay of genes, experience and the brain is crucial to understanding psychopathology. We review the recent gene-environment interaction (G×E) and imaging genetics literature with the goal of developing models to bridge these approaches within single imaging gene-environment interaction (IG×E) studies. We explore challenges inherent in both G×E and imaging genetics and highlight studies that address these limitations. In specifying IG×E models, we examine statistical methods for combining these approaches, and explore plausible biological mechanisms (e.g. epigenetics) through which these conditional mechanisms can be understood. Finally, we discuss the potential contribution that IG×E studies can make to understanding psychopathology and developing more personalized and effective prevention and treatment.     

Robustness and idealization in models of cognitive labor

Scientific research is almost always conducted by communities of scientists of varying size and complexity. Such communities are effective, in part, because they divide their cognitive labor: not every scientist works on the same project. Philip Kitcher and Michael Strevens have pioneered efforts to understand this division of cognitive labor by proposing models of how scientists make decisions about which project to work on. For such models to be useful, they must be simple enough for us to understand their dynamics, but faithful enough to reality that we can use them to analyze real scientific communities. To satisfy the first requirement, we must employ idealizations to simplify the model. The second requirement demands that these idealizations not be so extreme that we lose the ability to describe real-world phenomena. This paper investigates the status of the assumptions that Kitcher and Strevens make in their models, by first inquiring whether they are reasonable representations of reality, and then by checking the models’ robustness against weakenings of these assumptions. To do this, we first argue against the reality of the assumptions, and then develop a series of agent-based simulations to systematically test their effects on model outcomes. We find that the models are not robust against weakenings of these idealizations. In fact we find that under certain conditions, this can lead to the model predicting outcomes that are qualitatively opposite of the original model outcomes.     

Time crawls when you're not having fun: feeling entitled makes dull tasks drag on

All people have to complete dull tasks, but individuals who feel entitled may be more inclined to perceive them as a waste of their "precious" time, resulting in the perception that time drags. This hypothesis was confirmed in three studies. In Study 1, participants with higher trait entitlement (controlling for related variables) thought dull tasks took longer to complete; no link was found for fun tasks. In Study 2, participants exposed to entitled messages thought taking a dull survey was a greater waste of time and took longer to complete. In Study 3, participants subliminally exposed to entitled words thought dull tasks were less interesting, thought they took longer to complete, and walked away faster when leaving the laboratory. Like most resources, time is a resource valued more by entitled individuals. A time-entitlement link provides novel insight into mechanisms underlying self-focus and prosocial dynamics.     

Daily emotional dynamics in depressed youth: a cell phone ecological momentary assessment study

This study used a new cell phone ecological momentary assessment approach to investigate daily emotional dynamics in 47 youths with major depressive disorder (MDD) and 32 no-psychopathology controls (CON) (ages 7-17 years). Information about emotional experience in the natural environment was obtained using answer-only cell phones, while MDD youths received an 8-week course of cognitive behavioral therapy and/or psychopharmacological treatment. Compared with CON youths, MDD youths reported more intense and labile global negative affect; greater sadness, anger, and nervousness; and a lower ratio of positive to negative affect. These differences increased with pubertal maturation. MDD youths spent more time alone and less time with their families than CON youths. Although differences in emotional experiences were found across social contexts, MDD youths were more negative than CON youths in all contexts examined. As the MDD participants progressed through treatment, diagnostic group differences in the intensity and lability of negative affect decreased, but there were no changes in the ratio of positive to negative affect or in measures of social context. We discuss methodological innovations and advantages of this approach, including improved ecological validity and access to information about variability in emotions, change in emotions over time, the balance of positive and negative emotions, and the social context of emotional experience.