Antecedents and consequences of acculturation preferences of non‐indigenous Chileans in relation to an indigenous minority: longitudinal survey evidence

Two longitudinal survey studies were conducted with non‐indigenous majority Chilean participants (Ns = 755 cross‐sectional, 198 longitudinal in study 1; 390 cross‐sectional, 333 longitudinal in study 2). In contrast to most previous research, the longitudinal design allowed to test directly the hypothesised causal direction of effects. There were two broad research questions. Firstly, what is the relationship between acculturation preferences of non‐indigenous majority members and negative affect towards the indigenous Mapuche? More specifically, does a preference for integration lead to less negative affect than a preference for assimilation, separation or marginalisation? Related to this, do the dimensions of culture maintenance and contact taken singly predict negative affect and/or vice versa? Secondly, does knowledge about the Mapuche causally and indirectly influence acculturation preferences, partially mediated by sympathy with the Mapuche? Results confirmed that knowledge influenced acculturation preferences, and that sympathy was a partial mediator. Acculturation preferences, in turn, influenced negative affect. The contact dimension underlying the categorical acculturation strategies was a predictor of outcomes, while the culture maintenance dimension was not. Implications of the findings are discussed. Copyright © 2008 John Wiley & Sons, Ltd.     

A follow-up of families disputing child custody/access: Assessment,settlement, and family relationship outcomes

In this pilot study, 49 parents who had been involved in a custody and/or access assessment several years previously responded to a structured telephone survey. Information about eventual settlement processes, custody and access arrangements, satisfaction with the clinical assessment, children's adjustment, family relationships, and ongoing family problems was gathered an average of two and one half years after the assessment. Sole custody arrangements evidenced the greatest degree of stability from assessment to follow-up, while joint custody arrangements were more unstable. Visitation was not occurring for a substantial number of children (35%) at follow-up, even when it was recommended on a regular and frequent basis. Although parents reported little or no ongoing contact with their ex-spouse, they also reported continuing concerns and new problems with respect to the other parent or their children. The impact of this form of “parallel parenting” is discussed within the context of high-conflict, multiproblem families.     

Insensitivity to future consequences following damage to human prefrontal cortex

Following damage to the ventromedial prefrontal cortex, humans develop a defect in real-life decision-making, which contrasts with otherwise normal intellectual functions. Currently, there is no neuropsychological probe to detect in the laboratory, and the cognitive and neural mechanisms responsible for this defect have resisted explanation. Here, using a novel task which simulates real-life decision-making in the way it factors uncertainty of premises and outcomes, as well as reward and punishment, we find that prefrontal patients, unlike controls, are oblivious to the future consequences of their actions, and seem to be guided by immediate prospects only. This finding offers, for the first time, the possibility of detecting these patients' elusive impairment in the laboratory, measuring it, and investigating its possible causes.     

Why Adoptees Search: An Existential Treatment Perspective

This article frames the adult adoptee's search for his or her biological roots in an existential treatment perspective. This context offers depth of understanding of the adoptee's dilemma while allowing the counselor an expanded foundation from which to understand an adopted client's desire for personal historical information. An existential view of adoption allows the counselor to view the adoptee's struggle as a variation on the nearly universal human concerns of death, isolation, meaninglessness, being, anxiety, and freedom. Treatment approaches are suggested and discussed.     

Frequency versus magnitude of reinforcement: New data with a different procedure

Two pigeons, with previous exposure to concurrent schedules, were submitted to 29 sessions of 8 hours each with concurrent variable-interval variable-interval schedules in which reinforcement parameters changed from session to session. In the first nine sessions reinforcement durations were equal in both schedules while reinforcement frequencies varied; in Sessions 10 through 18, both frequency and duration of reinforcement were varied; in Sessions 19 through 29, only reinforcement duration was varied. Results with this different procedure confirm previous findings that behavior is more sensitive to changes in reinforcement frequency than to reinforcement magnitude.     

Estimation of psychometric functions from adaptive tracking procedures

Because adaptive tracking procedures are designed to avoid stimulus levels far from a target threshold value, the psychometric function constructed from the trial-by-trial data in the track may be accurate near the target level but a poor reflection of performance at levels far removed from the target. A series of computer simulations was undertaken to assess the reliability and accuracy of psychometric functions generated from data collected in up-down adaptive tracking procedures. Estimates of psychometric function slopes were obtained from-trial-by-trial data in simulated adaptive tracks and compared with the true characteristics of the functions used to generate the tracks. Simulations were carried out for three psychophysical procedures and two target performance levels, with tracks generated by psychometric functions with three different slopes. The functions reconstructed from the tracking data were, for the most part, accurate reflections of the true generating functions when at least 200 trials were included in the tracks. However, for 50- and 100-trial tracks, slope estimates were biased high for all simulated experimental conditions. Correction factors for slope estimates from these tracks are presented. There was no difference in the accuracy and reliability of slope estimation due to -target-level-for the adaptive track, and only minor differences due to psychophysical procedure. It is recommended that, if both threshold and slope of psychometric functions are to be estimated-from the trial-by-trial tracking data, at least 100 trials should be included in the tracks, and a three- or four-alternative forced-choice procedure should be used. However, good estimates can also be obtained using the two-alternative forced-choice procedure or less than 100 trials if appropriate corrections for bias are applied.