Persistence of stereotypic behavior: examining the effects of external reinforcers

Basic research has shown that behavioral persistence is often positively related to rate of reinforcement. This relation, expressed in the metaphor of behavioral momentum, has potentially important implications for clinical application. The current study examined one prediction of the momentum metaphor for automatically reinforced behavior. Participants were 3 children who had been diagnosed with an autism spectrum disorder and who engaged in stereotypic behavior maintained by automatic reinforcement. Results suggested that stereotypic behavior was more resistant to disruption following periods of access to preferred stimuli delivered on a variable-time schedule than following periods without access to preferred stimuli. The implications of these findings for the treatment of automatically reinforced behavior are discussed.     

Relation of positive memory recall count and accessibility with post-trauma mental health

ABSTRACT

Positive memory encoding and retrieval deficits have an empirical relation with several post-trauma outcomes. Drawing from the Contractor et al. model, we examined relations between positive memory characteristics and post-trauma mental health indicators. A trauma-exposed community sample of 203 participants (M_age?=?35.40 years; 61.10% female) was recruited via Amazon's Mechanical Turk. Participants completed measures of posttraumatic stress disorder (PTSD; PTSD Checklist for DSM-5), depression (Patient Health Questionnaire-9), posttraumatic cognitions (Posttraumatic Cognitions Inventory), affect (Positive and Negative Affect Schedule), count/number of recalled specific positive memories (Autobiographical Memory Test) and accessibility of a specific positive memory (i.e., subjective ease of recalling details of a memory; Memory Experiences Questionnaire-Short Form). Linear regression results indicated that PTSD intrusion severity, PTSD negative alterations in cognitions and mood (NACM) severity, PTSD alterations in arousal and reactivity (AAR) severity, self-blame, and positive affect significantly and negatively predicted the count of specific positive memories. Further, PTSD NACM severity, PTSD AAR severity, negative cognitions about the self, and negative affect significantly and negatively predicted accessibility of a specific positive memory. Thus, count/accessibility of specific positive memories was associated with several post-trauma mental health indicators; this highlights the relevance and potential impact of integrating positive memories into trauma treatment.     

VTLOGANL: Coding and analyzing videotaped data

Researchers using videotape as a primary means of data collection need flexible yet easy-to-use procedures and equipment for the time-consuming task of coding and analysis. The VTLOGANL program (for VideoTape LOGging ANaLysis) slaves a video deck to the computer system, allowing the researcher to code, in real time, video-recorded events of either a pulsed or duration nature. VTLOGANL’s innovative database design frees the researcher to define up to 9,999 different codewords for each project, organizing any combination of up to 30 of those codewords for each elapsed second of logging time. Reporting features, including data export and import, allow the researcher to examine quickly questions of codeword frequency, event duration, sequencing, and overlap, according to the requirements of the research design.     

Developing conceptions of racism among young white adults in the context of cultural diversity coursework

Despite substantial research on racial attitudes and racial identity development among young white adults, little is known about the development of their conceptions about racism. The present study assessed a five-step, empirically based contextualist model of the development of conceptions about racism in young white adults, adapted from the research of Perry (1970), Kitchener and Fischer (1990), and others. A total of 55 young white adults participating in cultural diversity coursework responded to questionnaires about the nature and causes of racism and responses were classified according to the five-step model. Results indicated that many first-year white college students think about racism in dualistic terms, comparable to those described by Perry (1970) in some first-year students' epistemological concepts. Over a semester, many students showed transitions to higher steps, conceptually integrating more dimensions of the problem. Such developmental transitions may be highly context-specific. Implications for educational interventions are discussed.     

The impact of training in sexual counselling for drugs workers upon HIV related risk behaviours and attitudes among injecting drug users

Forty-five drug-using clients attending two drug services at a London hospital were interviewed before and after a training programme on sexual counselling delivered to staff working at the two units. Following staff training, clients reported increased interaction during counselling with staff on sexual issues. Results indicated that drug use and injecting behaviours were unaflected by the stag training and that changes in sexual behaviour were modest. Attitudinal changes were more substantial with more positive attitudes emerging to limiting the number of sexual partners and towards the use of condoms. The value of observed attitudinal changes and the importance of decision-making processes of clients for harm minimization are discussed     

Creating embryos for research

ABSTRACT The 1987 Amendment to the Infertility (Medical Procedures) Act (Vic) allows the creation of embryos specifically for research purposes, as long as the proposed experiment takes place within 24 hours. The purpose of this paper is to determine whether there is aany significant ethical difference between creating embryos specifically for research and using those that are surplus from the new reproductive technologies. The relevant arguments in this debate can be grouped under three heads: those focussing on the embryo; those focussing on the possible consequences of these practices and those focussing on the women who donate the eggs.     

Signaling Mechanisms Mediating BDNF Modulation of Synaptic Plasticity in the Hippocampus

Although recent studies indicate that brain-derived neurotrophic factor (BDNF) plays an important role in hippocampal synaptic plasticity, the underlying signaling mechanisms remain largely unknown. Here, we have characterized the signaling events that mediate the BDNF modulation of high-frequency synaptic transmission. Mitogen-associated protein kinase (MAPK), phosphotidylinositol-3 kinase (PI3K), and phospholipase C-γ (PLC-γ) are the three signaling pathways known to mediate neurotrophin signaling in other systems. In neonatal hippocampal slices, application of BDNF rapidly activated MAPK and PI3K but not PLC-γ. BDNF greatly attenuated synaptic fatigue at CA1 synapses induced by a train of high-frequency, tetanic stimulation (HFS). Inhibition of the MAPK and PI3K, but not PLC-γ, prevented the BDNF modulation of high-frequency synaptic transmission. Neurotrophin-3 (NT-3), a close relative of BDNF, did not activate MAPK or PI3K and had no effect on synaptic fatigue in the neonatal hippocampus. Neither forskolin, which activated MAPK but not PI3 kinase, nor ciliary neurotrophic factor (CNTF), which activated PI3K but not MAPK, affected HFS-induced synaptic fatigue. Treatment of the slices with forskolin together with CNTF still had no effect on synaptic fatigue. Thus, although the activation of MAPK and PI3K is required, the two together are not sufficient to mediate the BDNF effect. Inhibition of new protein synthesis by anisomycin or cycloheximide did not prevent the BDNF effect. These data suggest that BDNF modulation of high-frequency transmission is independent of protein synthesis but requires MAPK and PI3K and yet another signaling pathway to act together in the hippocampus.     

Assessing Hypochondriasis: Findings on the Survey of Health Concerns

We describe a brief self-report measure for assessing hypochondriacal fears in adults. Called the Survey of Health Concerns (SHC), the measure was developed using DSM IV criteria for diagnosing hypochondriacal disorder as a guide. The measure was standardized on a sample of 188 college students. It was shown to have good internal and temporal reliability over a 2-week period. Moreover, scores on the SHC correlated significantly with worry proneness as measured by the Penn State Worry Questionnaire, and with the Hs scale of the MMPI-2, which together support the convergent validity of the measure. While men and women scored the same, participants who were being treated for a medical condition scored higher than those who were not being treated. Men who were under a doctor's care scored especially high, although this was based on a small sample of men and the effect could be spurious. A principal component factor analysis revealed two primary factors: one that described participants who felt poorly, made frequent trips to the doctor, and were fearful of illness and dying, and another that described participants who were particularly fearful of infectious diseases and took active steps to avoid becoming sick. Relatively little is known about hypochondriacal disorder. One reason for the dearth of knowledge in this area is that there has been no practical and reliable way to assess hypochondriacal fears, or more generally speaking, people's tendency to worry about their health. The SHC may help to fill this void. Results are admittedly preliminary and further study in medical settings is needed.