Aging affects both perceptual and lexical/semantic components of word stem priming: An event-related fMRI study

In this event-related fMRI study, brain activity patterns were compared in extensive groups of young (N=25) and older (N=38) adults, while they were performing a word stem completion priming task. Based on behavioral findings, we tested the hypothesis that aging affects only the lexical/semantic, but not the perceptual component of word stem priming. To this end, we distinguished between priming-related activity reductions in posterior regions involved in visual processing, and regions associated with lexical/semantic retrieval processes, i.e., left lateral temporal and left prefrontal regions. Both groups revealed significant priming-related response time reductions. However, in accordance with earlier findings, a larger priming effect was found in the group of young participants. In line with previous imaging studies, the groups showed common priming-related activity reductions in the anterior cingulate, and the left inferior prefrontal cortex extending into the anterior portion of the left superior temporal gyrus, and at lower thresholds also in the right occipital lobe. However, when directly comparing the groups, greater priming-related reductions were found for the young group in the left anterior superior temporal gyrus and the right posterior occipital lobe. These findings suggest that, converse to current psychological views, aging affects both perceptual and lexical/semantic components of repetition priming.     

Evaluation of a break-to-choice chained-schedule intervention for multiply maintained problem behavior

Interventions for multiply maintained problem behavior often involve developing separate treatment conditions to address each function. Although isolating treatment conditions lead to positive outcomes, developing individual treatments for each identified function may be time-consuming. Alternatively, synthesizing treatment procedures may allow for more efficient treatment effects. We extended previous research by evaluating functional communication training (FCT) and chained schedules of reinforcement to treat multiply maintained problem behavior in children diagnosed with autism spectrum disorder. First, we conducted a functional analysis that concluded problem behavior was multiply maintained. Next, we taught functional communication responses (FCRs) and implemented a chained schedule of reinforcement. During the initial link, FCRs for a break resulted in the presentation of a choice menu with the other putative reinforcers in the terminal link. The relevant reinforcer was delivered contingent on the emission of subsequent FCRs. Finally, we systematically schedule thinned to caregiver-informed terminal schedules for each participant. The results of our study demonstrated that FCT, in combination with a sequential compound schedule of reinforcement, effectively decreased multiply maintained problem behavior and increased appropriate alternative responses (FCRs and compliance) even at terminal schedules of reinforcement.     

Social dominance and anti-immigrant prejudice: A cross-national and prospective test of the mediating role of assimilation,multiculturalism, colour blindness,and interculturalism

Decades of research have shown that social dominance orientation (SDO) is one of the most important predictors of anti-immigrant attitudes. However, the mechanisms through which SDO can explain prejudice have been studied insufficiently. Using rich and diverse samples from France and from the province of Québec in Canada, the present research provides a cross-national (N = 1,852) and prospective (N = 534) analysis of a theoretical model in which the dimensions of SDO are indirectly predicting anti-immigrant prejudice via the intergroup ideologies of assimilation, multiculturalism, colour blindness and interculturalism. Results showed that interculturalism, a hierarchy-attenuating ideology was found to be a robust mechanism to explain the subtle effects of SDO-E on anti-immigrant prejudice whereas assimilation, a hierarchy-enhancing ideology was playing a more important role to explain direct and blatant effects of SDO-D on prejudice. The two most studied diversity approaches, multiculturalism and colour blindness, were largely redundant once interculturalism was considered. This pattern occurred in both France and Québec hence, favouring the context-independent pathway.     

Increase in Syntaxin 1B mRNA in Hippocampal and Cortical Circuits During Spatial Learning Reflects a Mechanism of Trans-synaptic Plasticity Involved in Establishing a Memory Trace

It has long been proposed that the cellular and molecular mechanisms responsible for LTP may well involve the mechanisms that lead to the type of synaptic modification that occurs during learning. However, it is also known that a single memory trace is encoded in spatially distributed networks; implying that alterations of synaptic strength occur at multiple sites along circuits of connected cells. Recent evidence suggests that regulation of the gene encoding syntaxin 1B, a presynaptic protein involved in exocytosis, plays an important role in the mediation of trans-synaptic LTP, a candidate mechanism for the propagation of plasticity in neural circuits during learning. Using in situ hybridization to measure the mRNA levels at different time points after learning a spatial working or reference memory task, we show that expression of the gene encoding this protein in the hippocampal and corticoprefrontal circuits increases linearly with performance at a critical window of learning when rats are reaching between 75% and 100% of their maximal performance. No changes were observed during the early phases of learning or when rats where overtrained. The correlational analysis indicates that coordinated increases in syntaxin 1B expression occurs in hippocampal circuits during working memory and in more widespread hippocampocortical circuits during reference memory. These results suggest that a form of trans-synaptic plasticity mediated in part by regulation of the expression of syntaxin 1B may play an active role in configuring specific spatially distributed circuits during the laying down of memories.     

Liberal reformers or militant radicals: What are the effects of education in the social sciences?

The assertion by Baer and Lambert (1990) that social science training does not promote radicalism, is tested in two studies. The first, using a sample of politically active students from Montréal (N=68) and measures of radical ideology and political convictions, shows social science students are over-represented among politically active students, and more likely to espouse radical ideology and label themselves members of groups aiming to restructure society, than students from other fields. The second study compares first and third-year social science students from Toronto (N=99) on measures of radical ideology, attitudes toward groups favouring change or the status quo, and causal attributions regarding poverty and unemployment. Results suggest social science training fosters positive evaluations of groups seeking change, espousal of radical ideology, tendency to fault the system for social problems, decrease in tendency to fault individuals, and development of a coherent ideological framework. Implications for academic socialization theories and methodological issues are discussed. Université Blaise Pascal This research was supported in part by grants from the Social Science and Humanities Research Council and from the Academic Research Program of the Department of National Defence of Canada awarded to the first author. The opinions expressed herein are those of the authors and do not necessarily reflect the views of the institutions with which they are affiliated. The authors would like to thank Dr. Stuart Lawson, at the Psychology Department at Queen's University, Kingston, for the use of his program comparing correlation matrices. We would also like to acknowledge the helpful comments of Editor Bruce J. Biddle.     

Does legally mandated consent to psychotherapy ensure ethical appropriateness?: the Colorado experience

We analyzed a sample of 356 forms containing information that Colorado law legally requires both licensed and unlicensed therapists to disclose to clients. The majority of forms contained the legally mandated information; fewer forms contained ethically desirable information. The average readability grade level was 15.74, corresponding to upper-level college, and 63.9% of the forms reached the highest (most difficult) readability grade of 17+. Therapists are obeying the law, but do not appear to be taking advantage of the opportunity to provide their clients useful information in an accessible way.     

The picture-superiority effect in category-association tests

In two experiments we examined the picture-superiority effect in the framework of the transfer-appropriate processing approach recently advocated by Roediger, Weldon, and Challis (1989). For the first time conceptual implicit-memory task is used, i.e., category association. In Experiment 1, subjects study a mixed list of pictures and words and then receive either a category-association test or a category-cued recall test, followed by a recognition test. The results show that performance on category-cued recall, recognition, and category-association tests are better when the material is studied in picture format. In Experiment 2, we show that producing a sentence with the material studied (picture or word) eliminates the picture-superiority effect in the implicit test, but does not eliminate picture superiority in the category-cued recall test. These results suggest that conceptually driven processing plays a critical role in category association and explicit tests of memory. The results are discussed in the framework of the transfer-appropriate processing approach to memory.     

The ingroup bias as a function of differences in resources within groups

Subjects were led to believe that two sub-groups were created according to similarity. Then they were assigned resources, received bogus offers, and asked to negotiate a mutually acceptable reward division. It was found that low resource members negotiated payoffs approximately equally. In contrast, high resource members negotiated larger payoffs to themselves when paired with outgroup members.