Brief motivational intervention with homeless adolescents: evaluating effects on substance use and service utilization.

A brief motivational intervention with 117 homeless adolescents was evaluated using a randomized design and 3-month follow-up. The intervention was designed to raise youths' concerns about their substance use, support harm reduction, and encourage greater service utilization at a collaborating agency. The study was designed to strengthen initial promising results of an earlier study (P. L. Peterson, J. S. Baer, E. A. Wells, J. A. Ginzler, & S. B. Garrett, 2006). Several modifications in the clinical protocol were included to enhance engagement with the intervention. Analyses revealed no significant benefits for intervention participants when homeless youths' substance use rates were compared with those of control participants. Service utilization during the intervention period increased for those receiving the intervention but returned to baseline levels at follow-up. Participants reported overall reductions in substance use over time. Differences between sampling methods for the current and previous study are discussed, as are the limitations of brief interventions with this population. Future research needs to elucidate mechanisms of change and service engagement for highly vulnerable youth.     

Pathways from proactive and reactive aggression to substance use.

Childhood aggression is a known risk factor for adolescent substance use; however, aggression is a complex construct, and developmental researchers have identified a variety of subdimensions that may be germane to substance use. Very little research has examined risk pathways from subdimensions of aggression. The current study examined a developmental model and tested whether childhood proactive aggression, reactive aggression, or both were related to the development of substance use in adolescence in a sample of 126 children (mean age at initial assessment = 10.4 years, SD = 0.51). Peer rejection and peer delinquency were examined as potential mediators of these relations. The findings suggest that proactive aggression was indirectly associated with substance use through peer delinquency. Reactive aggression was also indirectly associated with substance use through a complex mediational chain, such that high levels of reactive aggression were associated with high levels of peer rejection, which in turn were associated with peer delinquency (p = .06), which subsequently predicted substance use.     

Processes underlying deception: an empirical analysis of truth and lies when manipulating the stakes

The aim of the present experiment was to examine to what extent participants experience attempted control, cognitive load and arousal when they lie and tell the truth under lower‐stakes and higher‐stakes conditions. We expected both differences and similarities between truth tellers and liars. We expected that participants would experience these processes to a higher degree when they lied compared to when they told the truth (differences), but we also expected that both liars and truth tellers would be keen to make a convincing impression; and that raising the stakes would affect liars and truth tellers in a similar way (similarities). A total of 128 participants lied and told the truth during an interview (lying and truth telling was counterbalanced). Stakes were manipulated by informing half of the participants that their interviews would be recorded on videotape and would be analysed and evaluated by police officers. The predictions were supported. Copyright © 2005 John Wiley & Sons, Ltd.     

Does retrieval practice depend on semantic cues? Assessing the fuzzy trace account of the testing effect

Retrieval practice enhances long-term retention more than restudying; a phenomenon called the testing effect. The fuzzy trace explanation predicts that a testing effect will already emerge after a short interval when participants are solely provided with semantic cues in the final test. In the present study, we assessed this explanation by gradually reducing the surface features overlap between cues in the learning phase and the final recognition test. In all five experiments, participants in the control/word condition received as final test cues the same words as in the learning phase. The experimental final test cues consisted of scrambled words, words in a new context, scrambled words in a new context (Experiment 1), synonyms (Experiment 2), or images (Experiments 3, 4a, 4b). A short-term testing effect was only observed for the image final test cues. These results do not provide strong support for the fuzzy trace explanation of the testing effect.     

The Theory of Reasoned Action as a Model of Children's Health Behavior1

This research examined the applicability of the theory of reasoned action to school‐age children. Using structural equation modeling, we longitudinally modeled children's attitudes, norms, intentions, and behavior with regard to drinking alcohol. Respondents were 1,061 children attending public schools in the northwestern United States. Attitude, norms, and intentions (measured when the children were in 6th, 7th, 8th, and 9th grades) were used to predict alcohol use 1 year later. Two modifications of the model improved the overall fit at each grade level: separating attitude into 2 dimensions (positive and negative), and adding a path from social norm to behavior. The theoretical and practical implications of these results are discussed.     

Human variable ratio performance

The generality of the mathematical principles of reinforcement (MPR) was tested with humans. In Experiment 1A, participants’ mouse clicks were reinforced according to a series of variable-ratio (VR) values. In one condition, a situated task was used (searching for treasure on a map presented via a PC monitor); in the other, abstract version of the task, participants clicked on a white screen. Under the “map” condition, response rates increased with increasing ratio value before decreasing with further ratio increases; under the “no-map” condition, response rates decreased linearly from a peak at the smallest ratio. In Experiment 1B, the pattern of responding was confirmed under the “map” conditions using a different set of ratio values. In Experiment 2, reinforcer magnitude was manipulated using the “map” context. Response rates did not differ significantly when large rather than small cash reinforcers were delivered according to a VR 30 but were significantly higher when large rather than small cash reinforcers were delivered according to a VR 120. Together these experiments offer qualified support for extending MPR to the behavior of human participants.     

Using Direct Skills Teaching to Improve Job Skills for Persons With Disabilities

This study evaluated whether a direct skills training (DST) approach for persons with disabilities can better prepare participants for job interviews. Twenty graduate students in a master's program in rehabilitation counseling at various agency internship sites were trained in a 4‐session Presenting Qualifications curriculum based on DST administered to 126 participants in 20 group settings. Participants reported greater confidence and preparedness in the interview process, in answering difficult questions, and in highlighting past accomplishments after the group. Results support the feasibility of training entry‐level rehabilitation counselors in the DST approach to teach job interview skills to individuals with disabilities.     

Promoting intergroup openness and support for equality in a new cultural context: Replicating the effects of internal criticism

Exposure to an outgroup member voicing criticism of his or her own group fosters greater openness to the outgroup’s perspective. Research suggests that this effect owes its influence to a serial process in which participants’ perception of the risk involved in voicing internal criticism leads to an increase in the perceived credibility of the speaker. The credibility makes it possible for the speaker to be viewed as open-minded, which subsequently inspires greater hope. This process culminates in an increased openness to the outgroup. These findings have been restricted to the Israeli-Palestinian conflict, but here we examine their generalizability to racial conflict in the United States. Results reveal that White Americans exposed to internal criticism expressed by a Black authority figure express greater openness to African-American perspectives on race relations and are more willing to support policies of racial equality. Replicating past research, this effect is serially mediated by risk, credibility, and hope.     

On serendipity in science: discovery at the intersection of chance and wisdom

Synthese - ‘Serendipity’ is a category used to describe discoveries in science that occur at the intersection of chance and wisdom. In this paper, I argue for understanding serendipity...