Calculating self-referential statements,I: Explicit calculations

The proof of the Second Incompleteness Theorem consists essentially of proving the uniqueness and explicit definability of the sentence asserting its own unprovability. This turns out to be a rather general phenomenon: Every instance of self-reference describable in the modal logic of the standard proof predicate obeys a similar uniqueness and explicit definability law. The efficient determination of the explicit definitions of formulae satisfying a given instance of self-reference reduces to a simple algebraic problem-that of solving the corresponding fixed-point equation in the modal logic. We survey techniques for the efficient calculation of such fixed-points.     

Does family therapy produce change? an overview of outcome studies

Summary Families were randomly assigned to one of two forms of conjoint marital therapy: an insight-oriented treatment (n=10) or a problem-solving intervention (n=10.). The results on self-report measures of family functioning indicate that the problem-solving intervention produced more favorable changes after three months. However on long-term follow-up after a year, this more positive effect did not apparently persist, since the insight treatment group reported better results. Experienced therapists did better than inexperienced therapists in the insight treatment condition, but level of experience did not make a difference in the problem-solving intervention. A group of eight families who dropped out of the insight treatment group provided data on correlates of premature termination. Several of the practical obstacles to implementing an experimental design in a clinic setting are illustrated by the research.As we develop more sophisticated methodology, we hope that is the near future family therapy researchers will be better able to state which type of approach is more effective for whom and under what circumstances. A review of current studies of family therapy outcome research indicates that family therapy seems to be as effective as individual psychological treatment.     

Impulsivity,neuroticism, and caffeine: Do they have additive effects on arousal?

The personality dimensions of impulsivity and neuroticism have been linked to differences in basal arousal. The hypothesis tested was whether these personality variables and caffeine have additive effects on arousal. All subjects received three paired-associate trials on each of two neutral control lists, two lists with semantically similar stimuli, and two lists with acoustically similar stimuli. Half of the subjects received caffeine and half placebo. Although significant interactions with personality and drug condition were obtained, the ordering of the conditions was inconsistent with the assumption that the arousal performance curve is single peaked. Further, S. Schwartz's (Journal of Research in Personality, 1975, 9, 217–225) hypothesis that in paired-associate learning high arousal and low arousal subjects process semantic and physical information differentially was not supported. The general issue of how to determine whether individual differences in performance are caused by differences in arousal is discussed.     

The structure of interests as a structure of occupational stimuli and as a structure of affective responses

The structure of interests has usually been perceived as a structure of occupational stimuli, but it can also be conceived of as a structure of the affective responses that occupational stimuli elicit, or as a structure of these stimuli embedded within the matrix of affective responses which they produce. Each of these three structural representations was examined in this study. The semantic differential technique was used to rate a set of 10 occupational stimuli with 15 bipolar scales. A factor analysis of the stimuli yielded three occupational factors called Science, Things vs. People, and Social Welfare; a factor analysis of the scales indicated that the stimuli elicited Evaluation, Potency, and Activity responses. The three dimensions of affect were then used as the axes of a semantic space within which the occupational stimuli were located according to the unique affective meaning of each. The desirability of studying the structure of interests as a structure of occupational stimuli embedded within a structure of the responses they elicited was discussed.     

The effects of violent video games and shyness on individuals’ aggressive behaviors

The general aggression model (GAM) has suggested that the interaction between person factors (e.g., personality variables) and situation factors (e.g., playing violent video games [VVGs]) can increase individuals’ aggressive behaviors through their cognition (e.g., hostile attributions), affect (e.g., negative affect), and/or arousal. The present study employed a modified competitive reaction time task to test the effects of shyness, violent (vs. nonviolent) gameplay, and shyness on individuals’ positive–negative affect, hostile attributions, and aggressive behaviors. In addition, the present study also employed structural equation modeling (SEM) to test the mediation (by cognition and affect) and moderation (by shyness). Results showed that playing a VVG increased aggressive behaviors, negative affect, and hostile attributions primarily among shy participants. In addition, the results of SEM also revealed that this moderating role was mediated by negative affect and hostile attributions. The present study supported GAM and showed that individuals’ aggressive behaviors are differentially susceptible to VVGs, depending on their level of shyness in a “for bad and for worse” manner.