FDG-PET analysis and findings in amnesia resulting from hypoxia

The assumptions underlying neuroimaging, and problems in its analysis and interpretation, are commonly underestimated in neuropsychology. The ways in which fluoro-deoxy-glucose (FDG) positron emission tomography (PET) data can be analysed are discussed. PET findings from four patients who had suffered severe amnesia, following episodes of acute hypoxia, are presented. These patients had shown evidence of medial temporal (hippocampal and parahippocampal) atrophy on MRI brain scans. The PET data were analysed in several different ways. The converging findings were that the patients showed bilateral thalamic hypometabolism, and there was also evidence of retrosplenial hypometabolism bilaterally. Cognitively, these patients performed most like other patients with medial temporal lesions, but the results indicate that structural lesions can have distal metabolic effects on structures elsewhere. These findings are interpreted in the light of neuroanatomical observations concerning parallel projections between medial temporal lobe structures and the thalamus, some of which pass via the retrosplenium.     

Rationality,group choice and expected utility

In this paper I propose a view uniformly extending expected utility calculations to both individual and group choice contexts. By way of three related cases I discuss the problems inherent in applying expected utility to group choice cases. I show that the problem with such group cases does not essentially depend upon the fact that more than one agent is involved. A modified strategy is then devised allowing the application of the expected utility formula to these otherwise problematic cases. One case, however, leads to contradiction. But recognizing the falsity of the proposition.(1) If an agent x knows options A and B are both available, and x knows that were he to do A he would be better off (in every respect) than were he to do B, then doing A is more rational for x than doing B,allows the resolution of the contradiction and also allows my modified strategy to resolve otherwise paradoxical cases of group choice such as the Prisoners' Dilemma.This paper is dedicated to my parents, Arleen Eichengreen and Alvin Richter, for their encouragement, understanding, and financial support. Very special thanks also go to Daniel Hunter, Richard Sharvy, and Paul Horwich. In addition I owe a great deal to discussions and correspondence with Michael Ferejohn, John Ferejohn, Kit Fine, Allan Gibbard, Dale Jamieson, Gregory Kavka, David Lewis, J. Karel Lambert, Alice Perrin, Howard Pospesel, Brian Skyrms, J. Howard Sobel, and Michael Tooley.     

An experimental treatment using verbal punishment with two preschool stutterers

A multiple base-line experimental treatment was conducted with two preschool stuttering children. Each child conversed 20 min with the experimenter for 20 sessions. Treatment consisted of the presentation of the verbal stimulus “slow down” contingent upon a stuttering response. The percentage of words stuttered by both children decreased during the treatment sessions. Probe tape recordings conducted in each child's home revealed a decrease in stuttering frequency.     

Fixed vs. Flexible Neuropsychological Test Batteries Under the Daubert Standard for the Admissibility of Scientific Evidence

In Chapple v. Ganger, (1994), the Daubert standard was applied for the very first time to the use of fixed (standardized) versus flexible (nonstandardized) neuropsychological test batteries in the federal court. In this personal injury case the Chapple court gave far greater weight to the results obtained from a fixed battery than to the results obtained from two flexible neuropsychological test batteries. Significantly, under the Daubert standard the District Judge noted the lack of medical and scientific evidence to support the conclusions made by the Plaintiffs' two expert witnesses, a psychologist and a neuropsychologist, even though each had administered a comprehensive and flexible neuropsychological test battery and had based their conclusions on the test results. However, the Judge accepted as scientific evidence the objective test results obtained from the fixed Halstead–Reitan Neuropsychological Test Battery for Older Children administered by the Defendants' expert witness Dr. Ralph Reitan and also accepted his scientific expert medical testimony which was closely derived from these data. Applying the Daubert standard to the neuropsychological test results and opinions of the expert witnesses, the District Judge held that the entire reasoning process and not simply part of the reasoning process upon which the expert witness derives a conclusion must reflect scientific methodology.     

A Conceptual Overview of the Self‐Presentational Concerns and Response Tendencies of Focus Group Participants

Focus group respondents are often requested to perform tasks that require them to convey information about themselves. However, despite the potential for respondents to have self‐presentational concerns, research on focus group productivity has virtually ignored extant scholarship on impression management. This shortcoming is addressed by presenting a conceptual overview of the effects of self‐presentational concerns on focus group participation. A product of this overview is a conceptual model that posits that the amount and nature of information that people convey about themselves to others is a function of their eagerness to make desired impressions and their subjective probabilities of doing so. According to the model, when focus group participants are highly motivated to make desired impressions, they may be reluctant to present unbiased images of themselves. However, they are not likely to deceive unless they are confident in their abilities to ascertain and enact desired images. Those who are motivated to make desired impressions but are doubtful of doing so are likely to protect themselves by concealing self‐relevant information or avoiding self‐relevant issues. Implications of this model for research and practice are discussed.     

Using telehealth to teach valued skills to adults with intellectual and developmental disabilities

Telehealth uses electronic information and telecommunication technologies to deliver long-distance clinical services. It has successfully been used by clinical professionals to teach family and staff members to provide evidence-based assessment and treatment procedures. There is no research to date, however, evaluating the use of telehealth to directly teach individuals with intellectual and developmental disabilities (IDD). Thus, we evaluated the efficacy of a telehealth intervention using total task chaining with least-to-most prompting delivered via videoconference to 2 adults with IDD. Both participants demonstrated low independent responding during baseline with enhanced written instructions present. During intervention, which included vocal and model prompting, both participants met the mastery criterion for each skill in fewer than 15 sessions, which maintained after 2 weeks. Finally, both participants expressed satisfaction with the goals, procedures, and effects of the intervention. We discuss the broader scope of the intervention for individuals with disabilities when face-to-face services may not be feasible.     

Operant renewal of desirable behavior in a simulated workplace: A translational model

Organizational settings are replete with changing stimulus contexts and contingencies, which makes relapse a particularly relevant framework for understanding the ways in which controlling stimuli influence employee responding. The purpose of the current study was to develop a translational model to assess renewal of desirable behavior in a simulated workplace with neurotypical adults. Experiment 1 assessed renewal of desirable behavior using a computerized check processing task. Experiment 2 extended the findings and the translational utility of the experimental arrangement to implementation of a behavior-analytic teaching procedure. Results across both experiments demonstrated renewal of desirable behavior. Overall, the current methodology and findings extend the human operant literature on renewal and demonstrate a translational model that brings together operant renewal and organizational behavior management.     

Effects of self-control training for elementary students with emotional and behavioral disorders

Progressive delay training (PDT) has been used to promote self-controlled choices (i.e., selecting a larger, later reward over a smaller, immediate reward) for people with a variety of developmental characteristics. However, the efficacy of PDT has not been evaluated in children with emotional and behavioral disorders (EBD), who often have co-occurring symptoms of impulsivity. The purpose of this study was to evaluate the effects of PDT with a rule-following requirement on the impulsive choices of 6 elementary students with EBD using a modified changing criterion design. Results indicated that PDT alone did not improve self-control, but a modified version of PDT with a rationale and rule for selecting the delayed reward promoted self-control for 3 participants. The remaining 3 participants continued to make impulsive choices despite further modifications to the PDT protocol. We discuss implications of our results and directions for future research on treating impulsivity in children with EBD.     

Enhancing the training integrity of human service staff using pyramidal behavioral skills training

This experiment used a pyramidal training model to evaluate the effects of behavioral skills training (BST), delivered in a 1-time group-training format, on the extent to which 25 human service staff implemented BST when training others how to implement behavioral procedures. Results indicated that (a) the training workshop increased BST integrity to mastery levels for the majority of participants with varying levels of education, organizational positions, and training experience, (b) the training effects generalized to teaching an untrained skill, and (c) high levels of BST integrity maintained at follow-up 4 to 6 weeks after training for all 3 participants with whom probes were conducted. Moreover, participants indicated high levels of satisfaction with both the training workshop and BST as a training procedure.     

Relationship perceptions and persistence: do fluctuations in perceived partner commitment undermine dating relationships?

The authors propose specific temporal profiles that reflect certainty versus doubt about where a partner stands with respect to a dating relationship over time. Two multiwave longitudinal studies focused on within-participant changes in perceived partner commitment. Results from multilevel modeling indicate that individuals whose perceptions of partner commitment fluctuate over time were more likely to be in a relationship that eventually ended than were individuals whose perceptions remained relatively steady. For individuals in recently initiated relationships, the association of fluctuation in perceived partner commitment with later breakup was significant regardless of the initial level of perceived partner commitment or the trend, and for all participants, it remained significant when initial level, trend over time, and fluctuation over time of other meaningful variables were controlled.