Action planning in the presence of distracting stimuli: an investigation into the time course of distractor effects

Humans have a remarkable capability to respond efficiently to a stimulus of interest despite other stimuli competing for neural resources. The current study investigated how the human system copes with distracting stimuli. During each trial, participants viewed 2 sequential stimuli that were each associated with a specific action based on an arbitrary mapping. The 1st stimulus served as a distractor, and the 2nd stimulus required a response (target). When the distractor preceded the target by more than a few hundred milliseconds, response latencies were slower when the 2 stimuli were associated with the same response. The authors propose that this negative compatibility effect stemmed from an inhibitory mechanism that the human system utilizes to prevent the distractor from eliciting an unwanted response.     

An analysis of reinforcement sensitivity theory and the five-factor model

Reinforcement Sensitivity Theory (RST) and the Five-Factor Model (FFM) are two prominent personality accounts that have emerged from different backgrounds. Although the two accounts are applied to similar research topics, there is limited empirical work examining the correspondence between them. The current study explored the relationship between RST-based personality traits and the FFM domains and facets in an undergraduate sample (n = 668). Regression analyses indicated that Sensitivity to Punishment (SP) was positively associated with Neuroticism and Agreeableness, and negatively associated with Extraversion, Openness, and Conscientiousness. In contrast, Sensitivity to Reward (SR) was positively associated with Extraversion and Neuroticism, and negatively associated with Agreeableness and Conscientiousness. Exploratory analyses at the facet level specified the relationship between SP, SR, and each domain. A factor analysis was also conducted to explore the higher-order factor structure of RST and the FFM domains. Three factors emerged, which we labelled SP, Stability-Impulsivity, and Sensation Seeking. Taken together, these findings suggest that there is substantial overlap between these two accounts of personality. Copyright © 2007 John Wiley & Sons, Ltd.     

Family Empowerment as a Mediator between Family-Centered Systems of Care and Changes in Child Functioning: Identifying an Important Mechanism of Change

We investigated the associations among perceived fidelity to family-centered systems of care, family empowerment, and improvements in children's problem behaviors. Participants included 79 families, interviewed at two time points across a one-year period. Paired samples t-tests indicated that problem behaviors decreased significantly across a one-year period. Hierarchical multiple regressions indicated that both fidelity to family-centered systems of care and family empowerment independently predicted positive change in children's problem behavior over a one-year period. However, when family empowerment is entered first in the regression, the relationship between fidelity to family-centered systems of care and change in children's problem behavior drops out, indicating that family empowerment mediates the relationship between family-centered care and positive changes in problem behaviors. Consistent with other literature on help-giving practices, family empowerment appears to be an important mechanism of change within the system of care philosophy of service delivery. Implications for practice and staff training are discussed.     

Avoiding another mistake: Error and posterror neural activity associated with adaptive posterror behavior change

The magnitude of posterior medial frontal cortex (pMFC) activity during commission of an error has been shown to relate to adaptive posterror changes in response behavior on the trial immediately following. In the present article, we examined neural activity during and after error commission to identify its relationship to sustained posterror behavior changes that led to performance improvements several trials into the future. The standard task required participants to inhibit a prepotent motor response during infrequent lure trials, which were randomly interspersed among numerous go trials. Posterror behavior was manipulated by introducing a dynamic condition, in which an error on a lure trial ensured that the next lure would appear within two to seven go trials. Behavioral data indicated significantly higher levels of posterror slowing and accuracy during the dynamic condition, as well as fewer consecutive lure errors. Bilateral prefrontal cortex (PFC) and pMFC activity during the posterror period, but not during commission of the error itself, was associated with increased posterror slowing. Activity within two of these regions (right PFC and pMFC) also predicted success on the next lure trial. The findings support a relationship between pMFC/PFC activity and adaptive posterror behavior change, and the discrepancy between these findings and those of previous studies-in the present study, this relationship was detected during the posterror period rather than during commission of the error itself--may have resulted from the requirements of the present task. Implications of this discrepancy for the flexibility of cognitive control are discussed.     

A group-administered lag task as a measure of working memory

The purpose of the present studies was to evaluate the utility of a group-administered version of the n-back, or lag task. Experiments 1 and 2 describe the construction of the task and reveal that the modified lag task (MLT) produces the same performance trends as have been observed in individually administered versions of the lag task; performance decreased significantly as lag conditions increased in difficulty. Experiments 3 and 4 established convergent validity by comparing the MLT to another common working memory task, the operation-word span task, as well as the updated version of this task, the automatic operation span task. The results showed that MLT performance was significantly correlated to scores on both measures. These experiments provide important details about the MLT as a measure of working memory, in a group- or individual-administration setting.     

Childhood physical and sexual abuse and lifetime number of suicide attempts: a persistent and theoretically important relationship

BACKGROUND: Research to date has indicated that childhood abuse is associated with suicide, though little research has examined the unique contribution of specific types of abuse to suicidal behavior. We predict that childhood physical and violent sexual abuse will have a greater effect on suicide attempts than molestation and verbal abuse. METHODS: The National Comorbidity Survey data were used to test these predictions while controlling for a number of psychiatric and psychosocial variables. RESULTS: As expected, childhood physical and violent sexual abuse showed similar effects on lifetime suicide attempts, which were stronger than the effects of molestation and verbal abuse. LIMITATIONS: This was a cross-sectional, retrospective study, so true causality cannot be shown. Some measurement limitations exist. Additionally, effect sizes were small but still significant. CONCLUSIONS: While all forms of childhood abuse are troubling and create risk for future psychopathology and suicidality, the present study indicates that childhood physical and violent sexual abuse should be seen as greater risk factors for future suicide attempts than molestation and verbal abuse.     

Stigma and Discrimination in Health-Care Provision to Drug Users: The Role of Values, Affect, and Deservingness Judgments

This study examined the role of values, affect, and deservingness judgments in health professionals' views of patients with stigmatized conditions (e.g., drug dependence). Participants were 277 nurses who responded to a survey containing 2 scenarios of a nurse providing high- or low-quality care to a patient with a condition related to prolonged use of alcohol or heroin. Affective responses to the patient were more positive for nurses with higher self-transcendence values, and more negative for nurses with higher conservation values. Deservingness judgments were predicted by positive and negative affect toward the patient, but not by attributions of responsibility for drug use. Deservingness judgments emerged as strong predictors of nurses' satisfaction with the provision of high- or low-quality care. The findings imply that the deservingness judgments made by nurses reflected strong entitlement norms concerning the provision of proper care for patients that were independent of patients' perceived responsibility for their condition.     

How semantic is automatic semantic priming?

Priming for semantically related concepts was investigated using a lexical decision task designed to reveal automatic semantic priming. Two experiments provided further evidence that priming in a single presentation lexical decision task (McNamara & Altarriba, 1988) derives from automatic processes. Mediated priming, but no inhibition or backward priming was found in this type of lexical decision task. Experiments 3 and 4 demonstrated that automatic priming was found only for associated word pairs, as determined by word association norms, and not for word pairs that are semantically related but not associated. It is argued that automatic priming in the lexical decision task occurs at a lexical level not at a semantic level.     

The Effects of Instructions on Mothers’ Ratings of Attention-Deficit/Hyperactivity Disorder Symptoms in Referred Children

Tested whether instructions for how to rate child attention-deficit/hyperactivity disorder (ADHD) symptoms would improve the agreement between mothers’ ratings of symptoms in their children and ratings provided by teachers and objective observers. Sixty-eight mothers of 5 to 12 year old children (53 boys and 15 girls) referred for ADHD assessment were randomly assigned to receive or not receive the instructions. Mothers and teachers rated the children on the SNAP-IV Rating Scale and objective observers rated the children’s behavior during structured tasks. Relations between mother and teacher, and mother and observer ratings were generally stronger for mothers in the Instruction group compared to mothers in the No Instruction group, in some cases significantly stronger. The instructional materials also improved mothers’ knowledge of how to rate ADHD symptoms and reduced some associations between mothers’ ratings and family socioeconomic status. These instructions have the potential to improve clinical assessments of child ADHD symptoms.     

Left Hemispheric Lateral Preference and High Neuroticism Predict Disinhibition in Two Go/No‐Go Experiments

Although disinhibition is widely implicated in impulse‐control‐related psychopathologies, debate remains regarding the underlying approach and avoidance processes of this construct. In two studies, we simultaneously tested three competing models in which varying levels of extraversion, neuroticism, and hemispheric lateral preference are associated with disinhibition. In both studies (Study 1, N = 92; Study 2, N = 124), undergraduate students were randomly allocated to one of two versions of the go/no‐go task: one where participants were primed through reward to make more “go” responses and another where no such priming occurred. Neuroticism, extraversion, and hemispheric lateral preference measures were also collected. Across both studies, disinhibition was greatest in individuals who reported both a left hemispheric lateral preference and high neuroticism. This pattern was only found for those who were primed through reward to make more “go” responses. There was no association with extraversion. Contrary to previous research, our results suggest that left hemispheric asymmetry and neuroticism and not extraversion drive disinhibited approach, following the establishment of a prepotent approach response set. This has salient implications for the theoretical understanding of disinhibited behavior, as well as for the study of continued maladaptive approach behavior.