The effect of belief in weight controllability on anti-fat attitudes: An experimental manipulation

IntroductionAnti-fat attitudes reflect a type of discrimination on the basis of body weight and are one of the last accepted types of social stigma.ObjectiveTo evaluate the effect of exposure to priming messages about the causes of obesity on attitudes toward fat people.MethodParticipants (n = 580, M age = 22.19, 64.1% female) were randomly assigned to one of three possible conditions and then provided responses on three AFA subscales: Dislike, Fear of fat, and Willpower.ResultsPriming participants with messages confirming/challenging the weight controllability belief was associated with higher/lower levels on Willpower respectively compared to the control group. Unexpectedly, participants in both confirming and challenging groups showed significantly higher scores on Fear of fat. No differences were found on scores indicating Dislike.ConclusionThe current findings emphasize the effect of exposure to information about the causes of obesity on weight controllability beliefs.     

汉语名-动兼类效应的神经机制研究

文章运用ERP技术,考察了汉语名-动兼类词在语法语境下的脑神经机制。实验结果显示,名-动兼类词与非兼类的名词和动词所诱发的P600成分没有显著差异,只有在动词语境下,名-动兼类词才在额区和中央区诱发出一个更小的N400成分;与动词语境中的名-动兼类词相比,名词语境中的名-动兼类词诱发出更大的P600成分,这与非兼类名词、动词相互分离的神经机制相同。根据实验结果认为,与相应的非兼类名词和动词相比,从语法角度划分的汉语名-动兼类词没有特异的脑神经机制。     

The discounting of ambiguous information in economic decision making

In three experimental studies we investigated how decision makers respond to ambiguous information about costs and benefits. In Experiment 1, we studied the effect of ambiguity about prior costs. Experiments 2 and 3 focused on the effect of ambiguity about future outcomes. The collective results of the three studies suggest that decision makers discount ambiguous information. The findings are related to insights on the disjunction effect, the sunk cost effect, transaction decoupling, and ambiguity aversion. Copyright © 2003 John Wiley & Sons, Ltd.     

An experimental manipulation of metacognition: A test of the metacognitive model of obsessive-compulsive symptoms

The metacognitive model of obsessive-compulsive symptoms [Wells, A. (1997). Cognitive therapy of anxiety disorders: A practice manual and conceptual guide. Chichester, UK: Wiley] assigns a necessary causal role to metacognitive beliefs in the development of symptoms. The current study tested the model by evaluating the effects of experimentally manipulating such beliefs. A 2 × 2 factorial design was used. Thirty-two students with high and 32 students with low obsessional symptoms were subject to an experimental (metacognitive belief induction) or control (no metacognitive belief induction) condition. All participants underwent fake EEG recordings and were informed that the EEG could sense hypothalamus activity caused by having thoughts related to drinking. Participants in the experimental condition were told that if such thoughts were detected they may be exposed to an aversive noise. Controls were told that they may hear an aversive noise but this would be unrelated to the thoughts they had. Results showed a significant interaction effect between level of obsessional symptoms and belief induction. Analysis of this effect demonstrated that in the high obsession group, participants in the experimental condition had significantly more intrusions about drinking, time spent thinking about these intrusions and discomfort from them, than controls. There were also significant main effects on some measures, such as effort to control intrusions about drinking, with higher scores in the experimental condition irrespective of levels of obsessional symptoms. Results support the metacognitive model.     

Reducing emotional reasoning: An experimental manipulation in individuals with fear of spiders

We investigated the effects of smiling on perceptions of positive, neutral and negative verbal statements. Participants viewed computer-generated movies of female characters who made angry, disgusted, happy or neutral statements and then showed either one of two temporal forms of smile (slow vs. fast onset) or a neutral expression. Smiles significantly increased the perceived positivity of the message by making negative statements appear less negative and neutral statements appear more positive. However, these smiles led the character to be seen as less genuine than when she showed a neutral expression. Disgust + smile messages led to higher judged happiness than did anger + smile messages, suggesting that smiles were seen as reflecting humour when combined with disgust statements, but as masking negative affect when combined with anger statements. These findings provide insights into the ways that smiles moderate the impact of verbal statements.     

Reducing chronic anxiety by making the threatening event predictable: An experimental approach

Panic disorder is characterized by both specific, phased fear and generalized, chronic anxiety. Standard extinction procedures are efficient in reducing specific fear. However, methods based on human conditioning research - that are capable of reducing chronic anxiety have not yet been thoroughly investigated. This study evaluates a new way of reducing chronic anxiety by signaling aversive events (or by making them more predictable). Using an experimental approach with healthy participants, specific fear and chronic anxiety were operationalized in a within-subjects fear-potentiated startle paradigm by, respectively, conditioning to a cue by presenting predictable shocks and conditioning to a context induced by unpredictable shocks. The results clearly demonstrate that context conditioning is reduced when a discrete cue is added that predicts the onset of the aversive event. The data suggest that making unpredictable events, such as for example panic attacks, predictable, may reduce the generalized and sustained anxiety that often complicates exposure treatment.     

An organizational analysis of the form class effect

The paper reports eight experiments concerning the form class effect. If verb connectives enhance organization between pairs of nouns more than do conjunction connectives, then (a) the form class effect should obtain in cued but not free recall, (b) interactive imagery instructions should raise performance with conjunctions, removing the effect, (c) separation imagery instructions should reduce performance with verbs, removing the effect, and (d) prepositions implying spatial contact should be superior as mediators for cued recall compared with less suggestive prepositions. The results of the experiments confirm the predictions, except that grade 3 children do not perform as expected with the instructional variables.     

The Obama effect: An experimental test

Past research on stereotype threat and role model effects, as well as a recent quasi-experiment (Marx, Ho, & Freidman, this issue) suggested the possibility of an “Obama effect” on African American’s standardized test performance, whereby the salience of Barack Obama’s stereotype defying success could positively impact performance. We tested this reasoning in a randomized experiment with a broad sample of college students from across the country. Specifically, we tested the hypothesis that students prompted to think about Barack Obama prior to taking a difficult standardized verbal test would improve their performance relative to white students, and to African American students in control conditions that were not prompted to think about Obama. Our results did not support this hypothesis. Test scores were unaffected by prompts to think about Obama and no relationship was found between test performance and positive thoughts about Obama, a disconfirmation of both the findings and conclusions of the Marx, Ho, and Freidman study.     

Ambiguous benefits: the effect of bilingualism on reversing ambiguous figures

Two studies are reported in which monolingual and bilingual children, approximately 6 years old, attempted to identify the alternative image in a reversible figure. In both studies, bilingual children were more successful than monolinguals in seeing the other meaning in the images. In the first study, there was no relation between the ability to reverse the interpretation and performance on the children's embedded figures task, a task that superficially appeared to involve similar processes. The second study replicated this finding but showed that performance was strongly related to success in the post-switch phase of the dimensional change card sort task. In both cases, the meaning of an image must be reassigned, and bilinguals were better in both these tasks.     

Rorschach administration: a comparison of the effect of two instructions

The effect of administering the Rorschach Inkblot Method under 2 instructional sets was compared across 19 outcome measures. Sixty healthy participants randomly received either the short instruction "What might this be?" originally developed by Rorschach (1942) and recommended in the Comprehensive System (Exner, 1993), or a long instruction (Killingmo, 1980), which for many years has been the standard instruction in Norway. The short instruction produced significantly more questions to the examiner about the test and more brief protocols R < 14) than did the long one. However, for the traditional summary Rorschach scores no between-group differences were observed for the 2 instructional sets. It is suggested that if future studies of larger clinical and more representative samples demonstrate corresponding results, a more elaborate standard instruction might be preferable.     

Anxiety and the interpretation of ambiguous information: beyond the emotion-congruent effect

The authors investigated how anxiety influences the use of contextual information in the resolution of ambiguity. Participants heard ambiguous homophones (threat/neutral, positive/neural, and neutral/neutral) with related contextual information. State anxiety was manipulated experimentally. The interpretations of anxious participants were influenced by context to a greater extent than those of control participants. Some mood-incongruent effects were observed where anxious participants were more likely to adopt neutral interpretations of potentially threatening stimuli. Effects were observed in a spelling task (Experiments 1 and 2) and in a lexical decision task (Experiment 3), with supraliminal, and subliminal presentation of contextual cues, and with 2 different anxiety-induction procedures. Results show how anxiety affects both the content and the process of resolution of ambiguity.     

Rorschach interrater agreement estimates: An empirical evaluation

A standardized estimation of Rorschach interrater agreement is needed. Percentage agreement, although widely used, is found to be unsuitable. Forty-one protocols from adults in both a normal and a psychiatric sample were scored by two or three scorers, making 85 scoring pairs. Percentage agreement, correlations (phi and Pearson's r ), and kappa were computed on single response, total score, and category level. Percentage agreement shows minimal variation. Even when exceeding 0.80, it can obscure major disagreements. Kappa and correlations both vary in a similar way with level of disagreement. Total score level does not give additional information compared to single score and category levels. Kappa proved to be conservative and reliable and is therefore suggested as a standard estimate.     

Children's motivation analysis test (CMAT): An experimental manipulation of curiosity and boredom

The present study investigated the influence of manipulating the states of curiosity and boredom on the 10 scales of the Children's Motivation Analysis Test (CMAT). The CMAT is a multidimensional objective (T-data) instrument measuring several important dynamic motivation traits among primary school children. The CMAT was administered to 202 grade 6 and 7 children, pre- and post-exposure to either curiosity, boredom, or control (neutral) conditions. Scores on the Unintegrated Curiosity scale of the CMAT increased for the children in the Curiosity condition. For children in the Boredom condition, Unintegrated Pugnacity, Unintegrated and Integrated Narcism scores increased in response to the mildly aversive experimental manipulation. Evidently, a number of the dynamic traits measured in the CMAT are sensitive to situational stimuli as hypothesized in the dynamic calculus theory of motivation.     

The role of fear of anxiety and intolerance of uncertainty in worry: An experimental manipulation

The tendency to fear emotional experiences, such as anxiety, may be an important factor in the maintenance of excessive worry, which is the central feature of generalized anxiety disorder (GAD). The goal of the present study was to clarify the role of fear of anxiety in worry by assessing whether the experimental manipulation of fear of anxiety affects worry level. The study also assessed the combined effects of fear of anxious responding and intolerance of uncertainty (a factor already linked to pathological worry) on level of worry by grouping participants according to their tolerance for uncertainty. The results indicated that participants whose fear of anxiety was increased showed higher levels of worry compared to participants whose fear of anxiety was decreased. This finding provides preliminary support for the causal role of fear of anxiety in worry. Moreover, the results showed that increased fear of anxiety in combination with an intolerance for uncertainty led to the highest levels of worry, which suggests that these constructs have an additive effect on worry. The findings lend support to the integration of new conceptualizations of psychopathology with existing models of excessive worry, which could ultimately increase treatment efficacy for GAD.     

The recency effect in the perception of ambiguous figures

After a failure to obtain a recency effect in the perception of ambiguous figures three experiments were carried out to determine the conditions which govern the effect. It was found that the duration of the stimulus which precedes the ambiguous figure (the most recent stimulus) was important. Also of importance was the interval between the next-to-most-recent stimulus and the ambiguous figure. The effect of manipulating these variables was such that sometimes no recency effect was obtained, implying that their state is sometimes critical for the effect. Variations in the duration of the ambiguous stimulus did not cause the recency effect to vary. Recommendations are made for the demonstration of a reliable recency effect.     

Investigating the effect of contextual factors on driving: An experimental study

Alongside human factors, contextual factors are believed to have an ongoing and complex impact on driving outcomes. However, how and to what extent the components of context influence driving outcomes (e.g. rule violations, crash, stress, fatigue) are far beyond full understanding. The purpose of this study is to explore the effects of weather condition, lighting condition and traffic density on driving outcomes. Thirty-six volunteers were enrolled to participate into a driving simulator-based experiment. Each participant was required to complete twelve trials of simulated driving under different sets of scenarios. Driving outcome was measured by five dependent variables: frequency of speeding, frequency of lane deviations, number of correct sign recognition, completion time and workload. The results showed the frequency of speeding was significantly affected by weather condition, lighting condition and traffic density. Lighting condition had a significant effect on number of correct sign recognition. Weather condition, lighting condition and traffic density had significant effects on task completion time. Weather condition and lighting condition had significant effects on driver’s workload. The implications of the results could help traffic safety professionals better understand the risk factors that may lead to human errors during driving. Practically, countermeasures could be inspired and developed to mitigate the adverse impacts brought by driving context to minimum.     

Intra-Protocol Plate Failures: An Investigation of Rorschach Card Meaning

Thirty-three Ss were found who had IQs of average or better, but who nevertheless exhibited exactly two failures on the Rorschach. Analysis of the pairs of card rejections revealed a disproportionate number of card IX failures and a clustering among plates IV, VI, VII and IX.