Re-evaluation of decision alternatives dependent upon the reversibility of a decision and the passage of time

In the present experiment subjects made a decision between two alternatives which was either reversible or irreversible. After the choice, subjects evaluated the attractiveness of both alternatives once more under different time levels. It was found that with increasing time level, re-evaluation of alternatives increased under irreversible and decreased under reversible conditions. The results are discussed in the framework of dissonance theory.     

Misattribution of arousal and the effects of self-threatening information

Two experiments are reported on the effects of misattributing arousal. In both experiments, subjects took an intelligence test and received fictitious negative results about their performance. In the first experiment, subjects before receiving feedback were given a pill labeled as arousing; however, the ostensible effectiveness of the pill was varied. The greater the alleged strength of the pill, the less the test was derogated following feedback about performance on it and the more effort subjects reported expending on the test. In the second experiment, subjects were told that the pill was either arousing or relaxing and that its effect lasted for either a short or a long period of time. Initial test evaluations were more positive and estimates of effort expended were greater when the pill was described as arousing than when it was described as relaxing. However, whereas these differences were maintained over time when the pill's effects were described as of long duration, they disappeared over time when the pill's effects were described as of short duration.     

The effects of feedback about self and others on the recall and judgments of feedback-relevant information

After people have received feedback about the outcome of their behavior, their responses to information bearing on the validity of this feedback may be influenced by their desire to maintain a favorable self-image. This experiment investigated the cognitive mediators of these responses. Subjects who received negative feedback about their performance on an intelligence test disparaged intelligence tests in general and judged a report they had read to be unfavorable to intelligence tests. Nevertheless, they recalled more arguments in the report that were favorable to intelligence tests than did positive feedback recipients. These results contradicted the hypothesis that subjects selectively attend to information that helps them to maintain a positive self-concept in light of negative information about themselves. Rather, they may attempt to refute arguments that support the validity of the negative feedback they receive, and this relatively greater processing may facilitate the recall of these arguments later on. In contrast, there was no evidence that subjects try to refute information that calls the validity of positive feedback into question. Results had implications for two additional issues: first, whether the effect of performance feedback depends on whether it is received before or after information bearing on its validity; second, whether feedback has similar effects on recall and judgments by persons to whom it does not directly pertain.     

Letter visibility and word recognition: The optimal viewing position in printed words

It has repeatedly been shown that the time and accuracy of recognizing a word depend strongly on where in the word the eye is fixating. Word-recognition performance is maximal when the eye fixates a region near the word’s center, and decreases to both sides of this “optimal viewing position.” The reason for this phenomenon is assumed to be the strong drop-off of visual acuity: the visibility of letters decreases with increasing eccentricity from fixation location. Consequently, fewer letters can be identified when the beginning or ending of a word is fixated than when its center is fixated. The present study is a test of this visual acuity hypothesis. If the phenomenon is caused by letter visibility, then it should be sensitive to variations of visual conditions in which the letters are presented. By increasing the interletter distances of the word(e.g.,a_t_t_e_m_ p_ t), letter visibility was decreased. As expected from our hypothesis, the viewing-position effect became more exaggerated. An additional experiment showed that destroying word-shape information (e.g., aTtEmPt) decreased overall word-recognition performance but had no influence on the viewingposition effect. Varying the viewing position in words might thus be used as a paradigm, allowing one to separate out the contribution of letter information and supraletter information to word recognition.     

Ethics and Social Science: Which Kind of Co-operation?

The relation between ethics and social science is often conceived as complementary, both disciplines cooperating in the solution of concrete moral problems. Against this, the paper argues that not only applied ethics but even certain parts of general ethics have to incorporate sociological and psychological data and theories from the start. Applied ethics depends on social science in order to asses the impact of its own principles on the concrete realities which these principles are to regulate as well as in order to propose practice rules suited to adapt these principles to their respective contexts of application. Examples from medical ethics (embryo research) and ecological ethics (Leopold's land ethic) illustrate both the contingence of practice rules in relation to their underlying basic principles and the corresponding need for a co-operation between philosophy and empirical disciplines in judging their functional merits and demerits. In conclusion, the relevance of empirical hypotheses even for some of the perennial problems of ethics is shown by clarifying the role played by empirical theories in the controversies about the ethical differentiation between positive and negative responsibility and the relation between utility maximisation and (seemingly) independent criteria of distributive justice in the context of social distributions.     

Scopes of perception: The experimental manipulation of space and time

Discussions of space and time have been grist to the philosophers' mill for centuries. We argue that the evolution of psychology as an independent discipline was in part a consequence of addressing philosophical questions concerning the perception of space and time by recourse to experiment rather than exposition. Two initially separate factors assisted in establishing this independence. On the one hand, it was driven by the invention of instruments for stimulus control so that the methods of physics could be applied to the study of perceptual phenomena. On the other hand and somewhat later, it was followed by the development of psychophysical methods, which opened the possibility of quantifying the responses to such controlled stimulation. The principal instruments were invented in the first half of the nineteenth century, and they consisted of simple contrivances that manipulated time and space in ways that had not previously been appreciated. This article examines the devices that were invented, like stroboscopes, anorthoscopes, stereoscopes, tachistoscopes, chronoscopes, and more recently oscilloscopes, and the ways in which they influenced the scope of perceptual psychology in the past as well as in the present. In contemporary experimental psychology all these instruments have been replaced by the computer. While it has extended the scope of experiments even further it has introduced a new set of limitations.     

A clarification of selective exposure: The impact of choice

Selective exposure as a reaction to cognitive dissonance has long eluded researchers working in the realm of dissonance theory. It is proposed here that the difficulties in selective exposure paradigms have resulted from inadequate designs, and more particularly, it is likely that many of the previous findings are due to confoundings. The present experiment manipulates the variable of choice with the intent of controlling for a variety of possible confounds. The experiment shows a simple, theoretically predicted effect: Selective exposure, favoring supporting over nonsupporting information, increases to the degree that an onerous task is undertaken with volition.     

The dissemination of critical,unshared information in decision‐making groups: the effects of pre‐discussion dissent

Previous research in group decision making has found that in situations of a hidden profile (i.e. the best choice alternative is hidden from individual members as they consider their pre‐discussion information), unshared information is disproportionately neglected and sub‐optimal group choices are highly likely. In an experimental study, three‐person groups decided which of three candidates to select for a professorial appointment. We hypothesised that minority dissent in pre‐discussion preferences improves the consideration of unshared information in groups and increases the discovery rate of hidden profiles. As predicted, consideration of unshared information increased with minority dissent. The expectation of an improvement of group decision quality was partially supported. In diversity groups (i.e. each member prefers a different alternative) consideration of unshared information and group decision quality was significantly higher than in simple minority groups. Results are discussed in the light of theories of minority influence. The benefits of using the hidden profile paradigm with minority and diversity groups for theory development in the area of group decision making are highlighted. Copyright © 2002 John Wiley & Sons, Ltd.     

Selective exposure and decision framing: The impact of gain and loss framing on confirmatory information search after decisions

When people make decisions, they often prefer to receive information that supports rather than conflicts with their decision. To date, this effect has mainly been investigated in the context of decisions about gains, whereas decisions about losses have received less attention. Based on Prospect Theory, we expected information search to be differently affected by whether people previously have decided about gains or losses. Three studies have revealed that selectivity of information search is stronger after gain-framed rather than after loss-framed decision problems. An investigation of the underlying psychological processes revealed that gain decisions are made with increased subjective decision certainty (i.e. they are easier and less effortful to make), which in turn systematically increases confirmatory information search.