Representation facilitates reasoning: what natural frequencies are and what they are not

A good representation can be crucial for finding the solution to a problem. Gigerenzer and Hoffrage (Psychol. Rev. 102 (1995) 684; Psychol. Rev. 106 (1999) 425) have shown that representations in terms of natural frequencies, rather than conditional probabilities, facilitate the computation of a cause's probability (or frequency) given an effect--a problem that is usually referred to as Bayesian reasoning. They also have shown that normalized frequencies--which are not natural frequencies--do not lead to computational facilitation, and consequently, do not enhance people's performance. Here, we correct two misconceptions propagated in recent work (Cognition 77 (2000) 197; Cognition 78 (2001) 247; Psychol. Rev. 106 (1999) 62; Organ. Behav. Hum. Decision Process. 82 (2000) 217): normalized frequencies have been mistaken for natural frequencies and, as a consequence, "nested sets" and the "subset principle" have been proposed as new explanations. These new terms, however, are nothing more than vague labels for the basic properties of natural frequencies.     

Is the Interdependent Self More Sensitive to Question Context Than the Independent Self? Self-Construal and the Observation of Conversational Norms

Question answering requires close attention to the common ground to determine what the questioner wants to know. Because attentiveness to others is more likely to be a self-defining goal when the self is thought of as interdependent with others rather than independent of others, we predicted that self-construal influences attentiveness to the common ground. In Experiment 1, participants' temporary self-construal was manipulated through a priming technique. As predicted, interdependence-primed participants were more likely than independence-primed participants to take the recipient's knowledge into account and avoided providing redundant information in a self-administered questionnaire. Drawing on chronic differences in self-construal, Experiment 2 replicated these findings with participants from independent (Germany) and interdependent (China) cultures. Throughout, participants' differential attentiveness to the common ground resulted in differential question order effects, raising important methodological issues for cross-cultural research.     

Emotions as wishes and beliefs

Emotions can be assessed by means of different diagnostic methods, for example, by self-report instruments, ratings of facial expressions, or by projective techniques. This study presents an alternative approach: a computerized investigation of verbally expressed emotions by means of the Affective Dictionary Ulm (ADU; Dahl, H?lzer, & Berry, 1992), which was applied to responses in the Holtzman Inkblot Technique (HIT; Holtzman, 1988; Holtzman, Thorpe, Swartz, & Herron, 1961). A normal group (n = 30), patients with neurotic disorders (n = 30), borderline patients (n = 30), acute schizophrenics (n = 25), and chronic schizophrenics (n = 25) were compared in regard to verbally expressed emotions. According to the results, patients with neurotic disorders did not differ from the normal group in regard to verbally expressed emotions. Borderline patients expressed fear and emotions in general significantly more frequently than all other diagnostic groups. Furthermore, borderline patients differed in regard to specific emotions from patients with neurotic disorders, acute schizophrenics, and chronic schizophrenics. Acute schizophrenics did not differ from the normal group in regard to the expression of emotions, whereas chronic schizophrenics expressed anger, fear, anxiety, and emotions in general significantly less frequently than normals. By a discriminant analysis using verbally expressed emotions as predictors of the diagnosis, hit rates between 87% and 100% could be achieved. Furthermore, hypotheses about correlations between emotions on the one hand and internalized primitive object relations and bizarre-idiosyncratic thinking were tested empirically. Significant correlations could be demonstrated. These results support the validity of assessing emotions through a lexical content analysis of the HIT by use of the ADU.     

The duration component of the stress effect in stuttering

The purpose of the present study was to investigate whether there is a relationship between stuttering on stressed syllables and the duration of these syllables. Sixteen adults who stutter read a text consisting of 226 syllables. The relative stress of each syllable was rated, and syllables were categorized into long- and short-stressed syllables, unstressed syllables and intermediate syllables lying in-between. In order to isolate effects caused by within-word position from those caused by linguistic stress, syllables in initial and in subsequent positions were analyzed separately. In both word position categories stressed syllables were stuttered more often than unstressed syllables. Stuttering frequency of intermediate syllables seems to be in-between stressed and unstressed syllables, just as their stress level is rated in-between. Results regarding the duration of stressed syllables do not allow final conclusions.

Educational objectives: The reader will learn about and be able to describe (1) language factors related with stuttering events, (2) the stress effect in adults who stutter, and (3) methods to control for its confounding variables.     

Counting models of temporal discrimination

A three-category task was employed to test counting models for temporal discrimination. Unlike former approaches, the present one is not based on Weber functions. Specifically, the proposed test does not require the implicit but, nevertheless, debatable assumption that the pulse rate of the internal clock is constant for different durations of the standard interval. Furthermore, the present approach does not necessitate specific distributional assumptions about the interpulse times. An experiment was conducted to evaluate the predictions of this generalized counting model. The results are consistent with predictions of the generalized counting model. A further analysis suggests that the pulse rate decreases as the duration of the standard interval increases.     

Vier Philosophen über semantische Paradoxien

In his treatise on sophisms, the medieval logician and philosopher J. Buridan expounded a theory on what we have come to call semantic paradoxes. His theory has not yet been fully understood. The present paper aims at showing that Barwise’s and Etchemendy’s considerations on paradoxes (founded upon Aczel’s non-well-founded sets) provide the framework for an improved understanding. Barwise’s and Etchemendy’s account is contrasted with Kripke’s. Finally, a recent analysis of Buridan’s position by Epstein is criticized     

Students' complex problem-solving abilities: Their structure and relations to reasoning ability and educational success

Complex Problem Solving (CPS) is considered to be a promising candidate for capturing higher order thinking skills that are emphasized in new educational curricula but are not adequately measured by traditional intelligence tests. However, little is known about its psychometric structure and its exact relation to intelligence and educational success—especially in student populations. This study is among the first to use a large and representative sample of secondary school students (N = 563) to examine different measurement models of CPS—that conceptualize the construct as either faceted or hierarchical—and their implications for the construct's validity. Results showed that no matter which way it was conceptualized, CPS was substantially related to reasoning and to different indicators of educational success. Controlling for reasoning within a joint hierarchical measurement model, however, revealed that the impressive external validity was largely attributable to the variance that CPS shares with reasoning, suggesting that CPS has only negligible incremental validity over and above traditional intelligence scales. On the basis of these results, the value of assessing CPS within the educational context is discussed.     

Childhood intelligence and adult health: The mediating roles of education and socioeconomic status

The longitudinal relation between childhood intelligence and various health outcomes in adulthood is now well-established. One mediational model that accounts for this relation proposes that intelligence has cumulative indirect effects on adult health via subsequent educational attainment and adult socioeconomic status (SES). The aim of the present study was to examine whether and the extent to which educational attainment and SES mediate the impact of childhood intelligence on three dimensions of adult health in Luxembourg, a country with high-quality universal public health care. We used data from 745 participants in the Luxembourgish MAGRIP study. At the age of 12, participants completed a comprehensive intelligence test. At the age of 52, they reported their educational careers, SES, and functional, subjective, and physical health status. Using structural equation modeling, we investigated the direct and indirect effects (via educational attainment and adult SES) of childhood intelligence on adult health. We found that higher childhood intelligence predicted better functional, subjective, and physical health in adulthood. These effects were entirely mediated via educational attainment and SES. The mediational processes differed depending on the health dimension under investigation: Whereas SES was crucial in mediating the effect of intelligence on functional and subjective health, educational attainment was crucial in mediating the effect on physical health. These findings held up when considering adult intelligence and were similar for women and men. Our results suggest that even excellent public health care cannot fully offset the cumulative effects of childhood intelligence on adult health. Further studies are needed to investigate the relative importance of different mediators in the intelligence–health relation while including a broader set of objective health measures.     

Item-response theory modeling of IQ gains (the Flynn effect) on crystallized intelligence: Rodgers' hypothesis yes,Brand's hypothesis perhaps

Potential explanations for generational intelligence test score gains continue to be subject to intense debate and scrutiny in the scientific community. However, the explanatory value of some of the proposed causes remains difficult to determine, since only little empirical evidence is available. To clarify the role of two scarcely investigated theories accounting for the Flynn effect, this study set out to examine the role of changing test-taking behavior (Brand's hypothesis) and of a narrowing of the IQ ability distribution (Rodgers' hypothesis). Archival records of crystallized intelligence test performance over a time-span of 17 years of a large number of psychiatric inpatients and outpatients in Austria were investigated (N = 5445; 1978–94). This sample was particularly suitable to investigate our hypotheses since participants were under no pressure to perform which makes observed changes in test taking behavior attributable to personal style and ability rather than differential performance in pressure situations. Analytical approaches of both classical test theory and item response theory (IRT) yielded gains of 1.0 to 2.4 IQ points per decade. Test-taking behavior indicative of guessing and decreasing population IQ variability appeared to contribute both to IQ test score gains. IRT-based analyses showed that gains were largely preserved when controlling for highest educational qualification, while the test instrument showed measurement invariance between cohorts. However, IRT-based results also suggested that changes in test-taking behavior might not necessarily reflect increased guessing, but item drift instead. In all, this evidence emphasizes better performance of individuals of the lower tail of the IQ ability distribution in more recent years as one important contributing factor for generational IQ test score gains.     

Different pathways, same effects: Autonomous goal regulation is associated with subjective well-being during the post-school transition

Using self-determination theory as a theoretical framework, this study examines the associations between autonomous goal regulation and subjective well-being (life satisfaction, positive and negative affect, self-esteem) during the post-school transition. The sample consisted of 2,284 academic track students (62 % female) in Germany who answered a questionnaire at the end of high school and again 2 years later, allowing us to differentiate three post-school trajectories (university, vocational training, not in education). Structural equation modeling showed that autonomous goal regulation measured at Time 1 positively predicted Time 2 life satisfaction, positive affect, self-esteem, and autonomous goal regulation and negatively predicted negative affect, controlling for construct stability. However, subjective well-being indicators at Time 1 did not predict autonomous goal regulation at Time 2. Multigroup analyses indicated comparable associations between goal regulation and subjective well-being across groups, highlighting the strength and generalizability of the effect of autonomous goal regulation on subjective well-being during the post-school transition.