Changes in defensiveness and in affective distress following inpatient treatment of eating disorders: Rorschach comprehensive system and self-report measures

Conceptualizing eating disorders (EDs) as forming a coping mechanism against facing psychic pain, in this study, we examined the contribution of weight stabilization and ED behaviors to psychological outcomes of affective distress, defensiveness, and contact with inner/external reality among 2 subgroups of adolescent inpatients with (a) "restricting type" anorexia (AN-R) and (b) bingeing/purging type EDs (B/P). We administered Rorschach Comprehensive System (CS; Exner, 2003) and self-report measures at acute admission and on discharge. Data indicated that in both subgroups, stabilization of weight and disordered eating behaviors was accompanied by reduced explicit (self-reported) affective distress, yet by elevated implicit affective distress (D, SumShd). Subgroups' different Rorschach change trends indicated different dynamic processes in defensive style and contact with inner/external reality.     

In vitro reinforcement of hippocampal bursting: a search for Skinner's atoms of behavior.

A novel "in vitro reinforcement" paradigm was used to investigate Skinner's (1953) hypotheses (a) that operant behavior is made up of infinitesimal "response elements" or "behavioral atoms" and (b) that these very small units, and not whole responses, are the functional units of reinforcement. Our tests are based on the assumption that behavioral atoms may plausibly be represented at the neural level by individual cellular responses. As a first approach, we attempted to reinforce the bursting responses of hippocampal units in a highly reduced brain-slice preparation with local micropressure applications of behaviorally reinforcing dopaminergic drugs. The same injections were administered independently of bursting to provide a "noncontingent" control for nonspecific stimulation or facilitation of firing. It was found that the bursting responses of individual CA1 pyramidal neurons may be progressively facilitated in a dose-related manner by response-contingent (but not noncontingent) injections of dopamine itself, the dopamine D1-preferring agonist SKF 82958, the D3-preferring agonist quinpirole, and the D2-like selective agonist (+)-4-propyl-9 hydroxynapthoxazine. These findings support the conclusion that unit bursting responses can be reinforced in vitro in hippocampal slices, and they further suggest that the same dopamine receptor subtypes are involved in both cellular and behavioral operant conditioning. The results thus provide indirect support for Skinner's atoms-of-behavior hypothesis.     

Micro-position effects in visual short term memory

Short-term memory for visually presented eight-digit numbers was tested in a forced recall, read-and-dial task. The digits were presented non-grouped or grouped in 2+2+2+2 or 2+3+3 digit formats. Spatial grouping enhanced memory performance and produced local discontinuities in the serial position curves related to grouping format. These micro-position effects are explained in terms of the relative spatial distinctiveness of individual digits.     

The power of a place: Opening the college classroom to people with serious mental illness

Presented the structure and implementation of a university-based practicum course on social relationships for people with serious mental illness and college undergraduates. Grounded in an ecological view of social settings, cooperative learning models of education and mutual help principles, the practicum was designed to create a collaborative classroom setting where undergraduates and people with serious mental illness could both develop and enhance their own interpersonal skills and social network ties. The practicum demonstrates how a university can use its resources to help address community needs while simultaneously enhancing its mission of teaching and research. The role of social context in creating collaborative relationships among participants and the use of the university as a community resource are discussed.     

Differences in judgments of learning difficulty

Academically successful and less successful fifth graders were asked to make judgments about the ease of understanding and remembering various sentences and were given the opportunity to attempt to remember some of them before being asked to judge new sets of sentences. The results of the first experiment indicate that, at the beginning of the experiment, the successful students were much more likely than their less successful peers to realize that sentences expressing arbitrary relationships were more difficult to remember. These differences became even greater after students were given the opportunity to attempt to remember some of the sentences they had judged initially. The memory performance of the successful students also improved as they became more familiar with the experimental task, but the performance of the less successful students did not. The results of the second experiment showed that less successful students who had received appropriate training were able to use information about the arbitrariness of relationships as the basis for their judgments of learning difficulty. The training also facilitated their ability to remember. Implications of these findings are discussed.     

Mixtures of conditional mean- and covariance-structure models

Models and parameters of finite mixtures of multivariate normal densities conditional on regressor variables are specified and estimated. We consider mixtures of multivariate normals where the expected value for each component depends on possibly nonnormal regressor variables. The expected values and covariance matrices of the mixture components are parameterized using conditional mean- and covariance-structures. We discuss the construction of the likelihood function, estimation of the mixture model with regressors using three different EM algorithms, estimation of the asymptotic covariance matrix of parameters and testing for the number of mixture components. In addition to simulation studies, data on food preferences are analyzed.The authors are grateful to Donald B. Rubin and Michael E. Sobel for critical reading of a first draft of this paper and to three anonymous reviewers ofPsychometrika for their helpful comments and suggestions. The research of the first and the third author was supported by a grant from the Deutsche Forschungsgemeinschaft.     

Remembering children's emotions: sources of concordant and discordant accounts between parents and children.

Parents were asked to recall recent events that had evoked happiness, sadness, anger, and fear in their children. Children (N = 77, 2.3-6.6 years) indicated whether they remembered each event, and if so, they described the event and how it had made them feel. Agreement between parent and child concerning how the child felt varied as a function of emotion. Children agreed with their parents' emotion attributions most often for events that parents recalled as having evoked happiness and sadness, less often for fear, and least often for anger. Children disagreed with parents' attributions of happiness and sadness most often when parents and children differed concerning the attribution of children's goals. Discordant reports about children's anger were most frequent when parents and children reported conflicting goals. Discordant reports about fear were most frequent when parents and children focused on different parts of the temporal sequence surrounding the event.     

A scale for the psychological magnitude of number

A scale of the “psychological magnitude” of number was constructed from similarity ratings of the 45 number pairs that can be obtained from a set of 10 integers. A nonmetric analysis of these similarity ratings showed that “psychological number” was a power function of number.