Monkeys are rational!

Five squirrel monkeys showed a significant Symbolic Distance Effect (SDE) when tested on procedures designed to incorporate reaction time (RT) measures within the five-term series (“transitive inference”) task. Taken together with the high levels of transitive choice obtained by these subjects, this result shows that monkeys have met choice and reaction time criteria perceived by many as indexical of “linear representation”. Explicit evaluation of the representational implications of the SDE was subsequently undertaken in three-choice transfer tests, which initially revealed consistent deviations from the ranks predicted on a linear model. Extensive testing with the triadic method, however, elicited spontaneous improvement in overall choice ranking according to a linear principle. Further decomposition of the RT data showed that the irregularities in the initial transfer behaviour are by no means paradoxical. The ordinal separation data structure, from which the SDE is derived, masks two separate populations of scores--one fast and relatively undifferentiated, the other slow and based on judgements with poorly encoded items. And it is these factors, not inter-item distance, which, we argue, are the main determiners of the SDE. Whilst this phenomenon is thus only weakly indexical of principled linear representation, we contend that new (triad-based) ranking evidence suggests that monkeys may be capable of seriation as well as transitivity.     

Plasticity associated with escalated operant ethanol self-administration during acute withdrawal in ethanol-dependent rats requires intact matrix metalloproteinase systems

Repeated cycles of ethanol intoxication and withdrawal associated with dependence induce neuroadaptations in a variety of brain systems. Withdrawal-induced negative emotional states can be ameliorated by ethanol consumption; a learned process termed negative reinforcement. Accordingly, a dependence-induced phenotype is escalated ethanol self-administration. Matrix metalloproteinases (MMPs) are proteolytic enzymes which degrade the extracellular matrix to allow for synaptic reorganization and plasticity. To test the hypothesis that an intact MMP system is required for animals to learn about the negative reinforcing effects of ethanol and display escalated self-administration during acute withdrawal when ethanol-dependent, male Wistar rats were trained to self-administer ethanol and then assigned to either acute or chronic MMP inhibition treatment groups. The chronic treatment group received intracerebroventricular (ICV) infusions of the broad spectrum MMP inhibitor FN-439 or artificial cerebrospinal fluid (aCSF) via osmotic minipumps during a 1 month ethanol dependence induction period and subsequent post-dependence induction self-administration sessions that occurred during acute withdrawal. The acute treatment group only received ICV FN-439 or aCSF on the day of self-administration sessions following dependence induction during acute withdrawal. The results showed that inhibition of MMPs attenuated escalated ethanol self-administration following chronic and acute exposure conditions. Furthermore, once learning (i.e., plasticity) had occurred, MMP inhibition had no impact on escalated response patterns and animals previously subjected to MMP inhibition that did not escalate evidenced normal escalations in operant ethanol self-administration once FN-439 treatments were terminated. Thus, the present data identified that an intact MMP system is required for the escalated responding that occurs during acute withdrawal in dependent animals and implicate such escalation as a learned response.     

A preliminary examination of the effect of massage on state body image

Evidence suggests positive effects of massage on psychological health; however, little is known about the effects of massage on body image. This research examined the effect of massage on state body image as well as relations between trait body image and attitudes toward massage. Forty-nine female university students were randomly assigned to either a massage condition or a control condition. It was hypothesized that participants in the massage condition would report improved state body image following the intervention when compared to participants in the control condition. As predicted, participants in the massage condition reported a more favorable state body image than participants in the control condition post-manipulation. Certain body image evaluations were moderately associated with views that massage is pleasurable, with the link between Body Areas Satisfaction and viewing massage as pleasurable reaching significance. Research is needed to determine the mechanism/s through which massage improves body image.     

The mini-IPIP scales: tiny-yet-effective measures of the Big Five factors of personality

The Mini-IPIP, a 20-item short form of the 50-item International Personality Item Pool-Five-Factor Model measure (Goldberg, 1999), was developed and validated across five studies. The Mini-IPIP scales, with four items per Big Five trait, had consistent and acceptable internal consistencies across five studies (= at or well above .60), similar coverage of facets as other broad Big Five measures (Study 2), and test-retest correlations that were quite similar to the parent measure across intervals of a few weeks (Study 4) and several months (Study 5). Moreover, the Mini-IPIP scales showed a comparable pattern of convergent, discriminant, and criterion-related validity (Studies 2-5) with other Big Five measures. Collectively, these results indicate that the Mini-IPIP is a psychometrically acceptable and practically useful short measure of the Big Five factors of personality.     

Changing Trends in Doctoral Training Programs in Psychology: A Comparative Analysis of Research-Oriented Versus Professional-Applied Programs

Data from the National Research Council's 1995 study of doctoral programs provide a basis for the comparison of research-oriented Ph.D. programs in psychology and Ph.D. programs of professional-applied schools. The latter present a profile of faculty resources, attributes, and activities that differs sharply from that found in the research-oriented programs, and in Ph.D. programs in the other behavioral and social sciences. The difference in profiles suggests that the professional programs conduct Ph.D. training that departs from the training ordinarily regarded as necessary for the award of that degree.     

The effects of ambient temperature and insult on the motivation to retaliate or escape

In order to investigate the impact of high ambient temperature on the motivation of angered persons, 48 men were either insulted or not insulted under normal or excessively hot conditions. The men received ratings from a partner that conveyed a negative or neutral personality evaluation, ostensibly as part of an impression-formation task. During this time, the participants were exposed to normal or excessively hot temperatures in an experimental room while their partners were in a normal temperature room. The subjects were subsequently given the opportunity to choose between two tasks for the next part of the study. One task, described as tedious, permitted their leaving the situation earlier than did the other task, described as involving administration of white noise to their partner. The results revealed that the insulted relative to noninsulted men more often chose to participate in a potentially aggressive interaction in the normal conditions whereas insulted relative to noninsulted men chose more often to participate in a nonaggressive task in the hot conditions. The design of the study precluded a shared stress interpretation of the data. Supplementary data were interpreted as supporting a negative affect rather than an attributional interpretation of the results.     

On the nature of intraindividual personality variability: reliability, validity, and associations with well-being

Intraindividual personality variability is a construct that reflects the extent to which a person's self-reported personality changes over time or across social roles. Past studies have linked variability with important outcomes such as adjustment and well-being. However, existing variability measures conflate mean-level variance with true change over time, and thus these past findings are questionable. Three studies were conducted to examine the psychometric properties of existing variability indexes and to develop a new index that does not suffer from the problem of conflated variance. This new index is reliable and valid and can predict actual changes in self-reports over time. However, once mean-level variance is removed, intraindividual variability is no longer related to well-being.     

A solution-focused approach to working with clients who are suicidal

Self-harm and suicide are amongst the most challenging and frightening problems that therapists and counsellors can encounter in the course of their work. The risk of clients harming themselves in the course of treatment can debilitate the therapists from acting creatively and collaboratively, and make their actions defensive, focused solely on risk assessment rather than therapeutic change.Yet it is precisely a creative and collaborative response, such as that engendered by solution-focused therapy and other models, that is the most likely to facilitate change and re-empower clients to take back charge of their lives. This article describes a solution-focused approach to working with suicidal clients that can be used in conjunction with traditional approaches and which focus on establishing safety as well as assessing risk.Working from this model the clinician shifts to identifying client strengths and coping skills, to collaborating with the client to establish meaningful goals and to helping the client envision a positive future. Arguably, such an approach can increase collaboration between therapist and client and lead to a more client-centred safety plan.