The detection of semantic illusions: Task-specific effects for similarity and position of distorted terms

The effect of task demands on the detection of semantic illusions was investigated. In Exp. 1, subjects were given a detection task with different instructions for accuracy. Less illusions occurred under instructions that stressed accuracy, indicating strategic control of detection rates. In Exp. 2, sentences with dissimilar distorted terms resulted in shorter latencies than sentences with similar distorted terms in a detection task, but in longer response times in a question-answering task. In Exp. 3, the similarity effect was found to vary with the position of the distorted term in combination with task demands. In a verification task, the similarity effect did not differ for the beginning or the end of sentences. In a question-answering task, a significant similarity effect was observed only for distorted terms at the beginning of sentences. We argue that the results indicate minimal depth of semantic processing with respect to different task requirements. Implications for different theoretical accounts of semantic illusions are discussed.     

Status protection in high status minority groups

The present study investigated the conditions under which group members try to obtain membership in another group, or are motivated to protect their group membership when they risk losing it. One hundred and twenty-nine high school students participated as subjects in a laboratory experiment. Subjects were divided into two groups, allegedly on the basis of their problem solving style. The relative size (minority/majority) and status position (high/low) of the subject's group, as well as the permeability of group boundaries (permeable/impermeable) were manipulated as independent variables in a 2×2×2 factorial design. The main dependent variables were the extent to which individuals valued their group membership, and identified with their group. The main results are that membership in a group with high status is considered more attractive than membership in a low status group, This differential evaluation of high and low status groups is more extreme in minority groups than in groups of majority size. Furthermore, when group boundaries are permeable, members of high status minorities show relatively strong ingroup identification, indicating a strengthening of ties with their own group when an alternative (majority) group affiliation is possible. However, our expectation that permeable group boundaries would result in diminished ingroup identification in low status minorities was not confirmed. Some additional data suggest that unsatisfactory membership in a low status group is resolved in a different way.     

Ludwig Boltzmann's Bildtheorie and Scientific Understanding

Boltzmann’s Bildtheorie, which asserts that scientific theories are ‘mental pictures’ having at best a partial similarity to reality, was a core element of his philosophy of science. The aim of this article is to draw attention to a neglected aspect of it, namely its significance for the issue of scientific explanation and understanding, regarded by Boltzmann as central goals of science. I argue that, in addition to being an epistemological view of the interpretation of scientific theories Boltzmann’s Bildtheorie has implications for the nature of scientific understanding. This aspect has as yet been ignored because discussion of the Bildtheorie has been restricted to the realism-instrumentalism debate. To elucidate my analysis of Boltzmann’s Bildtheorie concrete examples are presented, and the pragmatist and Darwinist roots of Boltzmann’s view are discussed. Moreover, I propose to use Boltzmann’s ideas as a starting-point for developing a novel analysis of the notion of scientific understanding, of which a brief impression is given. It shows that the study of Boltzmann’s philosophy is not only of historical interest but can be relevant also to modern philosophy of science and to the methodology of theoretical physics. This revised version was published online in June 2006 with corrections to the Cover Date.     

The Concept of Abnormality in Medical Genetics

This paper explores usage of the concept ofabnormality in medical genetics and proposesdirectives for more careful usage of this concept.The conceptual difficulties are first explored, thena model is developed to assess actual usage, followedby analysis of a sample of genetic textbooks andgenetics literature. It appears that fact andvaluation are often intermingled, that referencestandards used to define 'genetic abnormalities' areoften not clear and that the concept of abnormality isoften used independent of the degree of certainty withwhich the altered genetype develops into a (seriously)harmful phenotype. On the basis of these findings itis argued that more restraint and more careful use ofthe concept of genetic abnormality of medical geneticsis appropriate as well as more agreement on the use ofreference standards.     

Explaining Proenvironmental Intention and Behavior by Personal Norms and the Theory of Planned Behavior1

The value of personal norms (Schwartz, 1977) for proenvironmental behavior has been demonstrated in previous studies (e.g., Vining & Ebreo, 1992), but not in addition to the theory of planned behavior (Ajzen & Madden, 1986). In the present study, this combination was investigated by means of a mail survey among a sample of 305 Dutch citizens who were enlisted to participate in a behavioral change intervention program on environmentally relevant behavior. Personal norms appear to increase the proportion of explained variance in 5 intentions and 4 self-reported measures of performed environmentally relevant behaviors beyond that explained by three of the theory of planned behavior constructs (i.e., attitude, subjective norm, and perceived behavioral control). Issues evoked by these results are discussed.     

Overpayment: Perceived qualifications and financial compensation

In this study expectancy and equity theory were compared. An experiment was carried out on the effect of overpayment. Overpayment was manipulated by varying perceived input (perceived qualifications) and received outcome (financial compensation). The experiment consisted of a 2 × 3 design: two levels of payment (4 guilders p.h. and 8 guilders p.h.) and three levels of perceived qualifications (high, medium, low). Sixty-six subjects were hired through the students placement service to decode personality questionnaires. Overpayment by manipulation of monetary rewards did not lead to greater production, as was hypothesized by Adams' equity theory (1965). As far m overpayment has been manipulated by perceived qualifications for the job the data confirmed equity theory. Several other theories (e.g. expectancy theory: Lawler, 1968b) can explain both results.