On the Nature of Continuous Physical Quantities in Classical and Quantum Mechanics

Journal of Philosophical Logic - Within the traditional Hilbert space formalism of quantum mechanics, it is not possible to describe a particle as possessing, simultaneously, a sharp position value...     

The effect of category learning on the representation of shape: dimensions can be biased but not differentiated

Recent studies have suggested a profound influence of category learning on visual perception, resulting in independent processing of previously integral dimensions. The authors reinvestigate this issue for shape dimensions. They first extend previous findings that some shape dimensions (aspect ratio and curvature) are processed in a separable way, whereas others (radial frequency components) are not. They then show that a category-learning phase improved the discrimination of a relevant with respect to an irrelevant dimension, but only for separable dimensions. No similar effect was found on the relative sensitivity for integral shape dimensions. Thus, category learning is capable of biasing separable shape dimensions but does not alter the status of dimensions in the visual system as either separable or integral.     

Suicide Disclosure in Suicide Attempt Survivors: Does Family Reaction Moderate or Mediate Disclosure's Effect on Depression?

Existing literature has found a link between disclosure of a stigmatized identity and improved mental health; however, research on the impact of suicide disclosure to family members is scarce. Suicide attempt survivors (n = 74) in the United States were examined to assess whether family reaction moderates or mediates the relationship between suicide disclosure and subsequent depression symptoms. Family reaction did not moderate but did mediate the relationship between disclosure and depression symptoms while controlling for time since most recent attempt. Higher rates of disclosure predicted more positive family reactions, which in turn predicted less severe depression symptoms. Findings indicate that family members can play an essential role in the recovery process after an attempt occurs, which has important implications for both researchers and clinicians who seek to decrease stigma for attempt survivors while simultaneously decreasing the likelihood of future attempts.     

Bemerkungen zur pragmatisch-epistemischen wende in der wissenschaftstheoretischen analyse der ereigniserkl?rungen

Ohne Zusammenfassung     

The linear regression line as a judgmental aid in visual analysis of serially dependent A-B time-series data

The purpose of this study was to investigate the effects of different types and magnitudes of serial dependence (first-order moving average and autoregression) and of linear regression lines within experimental phases on the agreement between results of visual and results of statistical data analyses. The stimulus material consisted of computer-simulated A-B-design data graphs. The time series were generated with a constant variance, varying degrees of treatment effects (changes in level), five conditions of serial dependency, and with or without linear regression lines. The material was presented to three groups of student raters (n₁=52, n₂=14, n₃=17) who rated the treatment effect in the graphs on a five-point scale. These ratings were compared with statistical results (time-series analyses). Each group had to interpret 70 graphs, 35 of which had regression lines. Data were analyzed by means of two three-factor and one four-factor ANOVA and by graphic display. The linear regression lines generally enhanced the agreement between the raters' estimations and the statistical results. Serial dependency also increased the agreement between the two analysis methods. However, with strong autoregression processes in the data, the raters tended to overestimate treatment effects relative to time-series analysis.Parts of this study were presented at the World Congress on Behavior Therapy, Washington, DC, December 11, 1983. The authors wish to express their appreciation to Christoph Bonk and Willi Ecker for their extensive collaboration in data analysis and for their assistance in carrying out the study.     

INDIVIDUALITY IN PLANNING: MEANING PATTERNS OF PLANNING STYLES

The study dealt with the particular contents subjects apply in a cognitive task. The hypotheses were that the frequency of specific contents would be related to the subject's information processing tendencies assessed in terms of the meaning system (Kreitler and Kreitler), that each content variable would be related to a pattern of meaning variables and that in some cases these patterns would resemble in structural features those related to personality traits, particularly cognitive traits. The subjects, 50 undergraduates of both genders, were administered in separate sessions a standard meaning questionnaire, assessing tendencies to use the meaning variables, and 10 planning tasks, coded in terms of eight conceptually-based variables (categories of contents, e.g., emotional, quantitative) and five factorially-based variables (defined on the basis of a factor-analysis of all responses, e.g., concern for aesthetics and external appearance, formal administrative arrangements). The findings showed that each content variable was related to a particular pattern of meaning variables providing insight into its cognitive dynamics. Six conceptually-based variables were related to patterns similar to those related to traits, not only cognitive. Discussion focuses on implications for the study of contents and of traits.