An MMPI Comparison of Two Groups of Institutionalized Delinquents

Two independent studies compared the MMPI performance of 2 groups of matched institutionalized delinquent boys, those who caused trouble in dormitories (SSs) and those who did not (GGs). In the 1st study, Scale 4 was the only statistically significant scale. Cross-validation found no scales statistically significant. Nineteen items which discriminated between SSs and GGs in the 1st study did not hold up in the cross-validation study. It is concluded that the MMPI has questionable value in discriminating between different levels and types of delinquents.     

Abstract: Sample Size Planning for Latent Curve Models

When designing a study that uses structural equation modeling (SEM), an important task is to decide an appropriate sample size. Historically, this task is approached from the power analytic perspective, where the goal is to obtain sufficient power to reject a false null hypothesis. However, hypothesis testing only tells if a population effect is zero and fails to address the question about the population effect size. Moreover, significance tests in the SEM context often reject the null hypothesis too easily, and therefore the problem in practice is having too much power instead of not enough power.

An alternative means to infer the population effect is forming confidence intervals (CIs). A CI is more informative than hypothesis testing because a CI provides a range of plausible values for the population effect size of interest. Given the close relationship between CI and sample size, the sample size for an SEM study can be planned with the goal to obtain sufficiently narrow CIs for the population model parameters of interest.

Latent curve models (LCMs) is an application of SEM with mean structure to studying change over time. The sample size planning method for LCM from the CI perspective is based on maximum likelihood and expected information matrix. Given a sample, to form a CI for the model parameter of interest in LCM, it requires the sample covariance matrix S, sample mean vector , and sample size N. Therefore, the width (w) of the resulting CI can be considered a function of S, , and N. Inverting the CI formation process gives the sample size planning process. The inverted process requires a proxy for the population covariance matrix Σ, population mean vector μ, and the desired width ω as input, and it returns N as output. The specification of the input information for sample size planning needs to be performed based on a systematic literature review. In the context of covariance structure analysis, Lai and Kelley (2011) discussed several practical methods to facilitate specifying Σ and ω for the sample size planning procedure.     

Role of Religious Attendance and Identity Conflict in Psychological Well-being

A sample of individuals who identified as gay or lesbian were administered measures of church attendance, their religious organization’s view of homosexuality, perceived conflict between religious faith identity and sexual orientation identity, social support, depression, and generalized anxiety. Among participants who rated their church as rejecting of homosexuality, greater frequency of attendance was related to a higher incidence of GAD symptoms, but not depression. No correlation was found for those attending accepting faith communities. Those who attend rejecting faith communities attended services less often, experienced greater identity conflict, and reported significantly less social support than those of the Accepted group. Regression analyses indicated that identity conflict and social support did not fully account for the relationship between attendance and GAD symptoms. Overall, findings from the current study support previous suggestions that participation in conservative or rejecting religious communities may adversely affect the emotional well-being of GL individuals.     

Age Trends in Eidetikers

The entire available population (N = 408) of a primary school in Perth, Western Australia, was tested for eideticism using a slightly modified presentation of the Haber and Haber (1964) procedure. Sixteen eidetikers were found in the age range covered (5–13 years). When classified into four age categories (5–6, 7–8, 9–10, 11–13), the number of eidetikers in relation to noneidetikers showed a statistically significant and systematic decline with increasing age. These results are discussed in relation to their possible significance for a theory of eidetic development.     

Primary Process Content in Paranoid Schizophrenic Speech

Free speech samples given by paranoid schizophrenics, nonschizophrenic paranoids, and nonpsychotic psychiatric patients were submitted to computerized content analysis. Speech samples were searched for words belonging to the Regressive Imagery Dictionary (Martindale, 1975), which yields a well-validated measure of primary process content. Three word-concreteness dictionaries were also employed. Compared to the other groups, paranoid schizophrenics produced speech higher in primary process content as well as in transitive verb concreteness. Results are consistent with psychoanalytic theory.     

Stimulus Determinants of Aggregative Behavior in the Domestic Chicken

Identity status and self-esteem were determined for 88 undergraduate college women. Identity status was measured two ways: with the sexual values questions included, and with the ORP (occupational goals, religious ideology, and political ideology) interview alone. Significant differences in self-esteem as measured by the Texas Social Behavior Inventory (TSBI) were found for women in the four identity statuses. These differences were significant on the basis of both methods of identity assessment. Achievement women scored higher than Moratorium and Diffusion women, but not Foreclosure women. Moratorium women had the lowest self-esteem in the sample. Results were discussed as supportive of the notion that achievement of identity is enhancing of self-esteem in women, and that nontraditional areas of identity development are becoming more important determiners of adjustment in women. The differential adaptability of Moratorium and Foreclosure statuses for women was discussed.     

Haptic and Visual Influences on Grasp Point Selection

When using precision grip to pick up objects, there are many possible pairs of grasp points that permit the thumb and index finger to exert opposed forces for secure grip. Previously, it was shown that individuals select grasp points so that the line between them (grasp axis) passes through or near the center of mass (CoM), thus minimizing the torque around the grasp axis during lifting. The accuracy of grasp axis selection depended on object spatial symmetry, indicating the importance of vision. The authors investigated how grasp point selection is influenced by haptic as well as visual information. Ten participants lifted cuboids whose CoM was located either symmetrically in the geometric center or asymmetrically toward one end. Results for the asymmetric cuboid revealed that grasp points migrated toward the asymmetric CoM from the geometric center. This was more pronounced in the presence of visual cues that reliably indicated the location of CoM. The results suggest that grasp point selection is influenced by a multimodal representation of CoM.     

Intra-Individual Variability of Normal and Educable Mentally Retarded Children on a Coincidence Timing Task

A visual coincidence timing task was used to compare the level of performance (constant error) and the intra-individual variability of 100 normal and 100 educable mentally retarded children. The mean performance of the intellectually normal children on this task was significantly superior to that of the retarded children, and the intra-individual variability of the latter was significantly greater than that of the former. The hypothesis that high intra-individual variability and depressed level of performance are closely associated was not supported.     

The Structure of Objects

According to the principle Grice calls ‘Modified Occam's Razor’ (MOR), ‘Senses are not to be multiplied beyond necessity’. More carefully, MOR says that if there are distinct ways in which an expression is regularly used, then, all other things being equal, we should favour the view that the expression is unambiguous and that certain uses of it can be explained in pragmatic terms. In this paper I argue that MOR cannot have the central role that is typically assigned to it by those who deploy it. More specifically, I argue that potential justifications of the epistemic import of parsimony in semantic theorizing are problematic, and that even if MOR could be justified, it has a redundant role to play in adjudicating the debate between the ambiguity-theorist and the proponent of the pragmatic approach.