The effects of mental contamination on the hindsight bias: Source confusion determines success in disregarding knowledge

We present data from eight experiments in which we explored the effects of source confusion on the hindsight bias; participants' success in disregarding information when they were instructed to do so was affected by participants' level of source confusion. In Experiment 1 we demonstrated participants' failure to disregard Revolutionary War information they recently learned while reading an essay; this failure to discount was not affected by participants' essay reading times (Experiment 1a). In Experiment 2 participants successfully discounted obscure War of 1812 information; this discounted information remained available in memory (Experiment 2a). In a direct test of source confusion (Experiment 3) we showed that participants discriminated between presented and not‐presented War of 1812 information better than they discriminated presented and not‐presented Revolutionary War information. In Experiments 4 and 4a we tested and rejected a motivational explanation for our findings, namely that subjects voluntarily withheld information when asked to disregard it. We tested a debiasing technique in Experiment 5 and found it was successful in helping participants discount familiar information. Results throughout are discussed as being attributable to source confusion. Copyright © 2008 John Wiley & Sons, Ltd.     

Betrayal: A psychological analysis

Betrayal is the sense of being harmed by the intentional actions or omissions of a trusted person. The most common forms of betrayal are harmful disclosures of confidential information, disloyalty, infidelity, dishonesty. They can be traumatic and cause considerable distress. The effects of betrayal include shock, loss and grief, morbid pre-occupation, damaged self-esteem, self-doubting, anger. Not infrequently they produce life-altering changes. The effects of a catastrophic betrayal are most relevant for anxiety disorders, and OC D and PTSD in particular.Betrayal can cause mental contamination, and the betrayer commonly becomes a source of contamination. In a series of experiments it was demonstrated that feelings of mental contamination can be aroused by imagining unacceptable non-consensual acts. The magnitude of the mental contamination was boosted by the introduction of betrayal themes. Feelings of mental contamination can also be aroused in some ‘perpetrators’ of non-consensual acts involving betrayal. The psychological significance of acts of betrayal is discussed.     

Breaking and creating habits on the working floor: A field-experiment on the power of implementation intentions

Previous research has shown that implementation intentions are effective tools to promote new behavior. The present study aimed to provide the first evidence that conscious planning is an effective tool in replacing well-learned habits with new habits. This was tested in a field-experiment on repetitive behavior in the domain of recycling, using 109 employees of a tele-company as participants. Recycling behavior of the participants was observed by the actual amount of paper and the number of plastic cups in their personal wastebaskets. Following a pre-measure, participants were assigned to either implementation intention conditions, conditions in which an eye-catching facility was placed to promote recycling behavior, or control conditions. Recycling behavior was substantially improved in the facility as well as the implementation intention conditions in week 1 and week 2 and still 2 months after the manipulation. These data supported our hypothesis that planning breaks down unwanted habits and creates new ones.     

How Financial Constraints Influence Consumer Behavior: An Integrative Framework

Financial constraints are economic limitations on behavior. Given that millions of people experience chronic or episodic financial constraints, we sought to review research that provides insight into how they affect consumer behavior. We propose an integrative framework that draws insights from multiple literatures that have examined financial constraints from different perspectives. The framework distinguishes between four perspectives, which are rooted in literatures on resource scarcity, choice restriction, social comparison, and environmental uncertainty and highlights different temporal stages of responding to financial constraints, distinguishing between reacting, coping, and adapting. Beyond the obvious negative effects of financial constraints, our framework emphasizes consumer resilience, highlighting that consumers often successfully cope with and devise adaptive strategies to deal with financial constraints. By broadening the behavioral and temporal scope of financial constraints considered within consumer psychology, this framework helps us to understand the often strong and sometimes counterintuitive effects of financial constraints on consumer behavior.     

Exposure to Parental Cigarette Smoking and Child Problem Behaviors: A Longitudinal Study

This study examined exposure to environmental tobacco smoke (ETS), a major public health problem. ETS has been found to be associated with an increased risk of adverse health effects in children. This study utilizes data from a community-based, longitudinal investigation examining the relation between children’s exposure to ETS and later internalizing symptoms and externalizing behaviors. Interviews were administered to a representative community sample of participants from two New York State counties in 1983, with subsequent interviews in 1985–1986, 1992, 1997, and 2002–2003 (when the participants’ mean age was 32). Data was collected on various personality and behavioral characteristics of the participants, and on internalizing symptoms and externalizing behaviors demonstrated by their children. Results indicated that children’s exposure to ETS was associated with an increased risk for both internalizing symptoms and externalizing behaviors. This relationship was maintained despite control on a number of parental psychosocial risk factors (e.g., demographic variables, personality and behavioral attributes) that have been found to be associated with both parental cigarette smoking and behavior problems among children. These data, which indicate an association between exposure to ETS and internalizing symptoms and externalizing behaviors among children, support public health policies to further restrict children’s exposure to ETS.     

Spatial learning in pigs: effects of environmental enrichment and individual characteristics on behaviour and performance

This study investigated the effects of both environmental enrichment and individual behavioural characteristics on spatial cognitive capabilities of pigs, using a novel latent spatial learning paradigm based on Tolman’s detour experiments (1948). Pigs were housed either in ‘barren’ pens or in pens enriched with straw bedding from birth. Pigs were restrained in a Backtest at 10 and 17 days postpartum. Based on their escape behaviour in this test, which has been shown to reflect their behavioural style, six ‘high-resisting’(HR) and six ‘low-resisting’ (LR) pigs were selected from each housing environment (n = 24 in total). At 12 weeks of age, pairs of pen mates (LR and HR) were exposed to a maze three times (exploration trials). Pigs were then placed individually in the maze, and social reinstatement proved to be a strong incentive to find the exit leading to the home pen. We subsequently blocked the direct route to the exit, forcing animals to find a detour (memory test 1, MT1). This test was repeated once to investigate the relative improvement, i.e. detour learning (memory test 2, MT2). Housing condition and Backtest response strongly affected exploration patterns. In spite of this, no effects on performance during the subsequent memory tests were found. Performance was substantially improved in MT2, indicating that once a goal is apparent, pigs are able to solve a complex spatial memory task easily. In conclusion, social reinstatement provided a good incentive to complete a spatial task, and the substantial improvement in performance between MT1 and MT2 stresses the need for task complexity when testing spatial memory in pigs. Housing conditions or individual behavioural style did not affect spatial memory during MT1 or MT2. However, housing environment and behavioural style strongly affected explorative behaviour of pigs in an unfamiliar maze during both exploration trials and memory tests. This implicates that apparent effects of environmental enrichment on spatial learning and memory in pigs might reflect differences in explorative patterns rather than in cognitive processes.     

Comparing one-step M-estimators of location when there are more than two groups

Methods for comparing means are known to be highly nonrobust in terms of Type II errors. The problem is that slight shifts from normal distributions toward heavy-tailed distributions inflate the standard error of the sample mean. In contrast, the standard error of various robust measures of location, such as the one-step M-estimator, are relatively unaffected by heavy tails. Wilcox recently examined a method of comparing the one-step M-estimators of location corresponding to two independent groups which provided good control over the probability of a Type I error even for unequal sample sizes, unequal variances, and different shaped distributions. There is a fairly obvious extension of this procedure to pairwise comparisons of more than two independent groups, but simulations reported here indicate that it is unsatisfactory. A slight modification of the procedure is found to give much better results, although some caution must be taken when there are unequal sample sizes and light-tailed distributions. An omnibus test is examined as well.     

污染效应在消费者行为领域的表现及其心理机制

随着健康问题越来越受到消费者的重视, 学者们对污染效应的研究和兴趣也与日俱增, 特别是在消费者的感知和偏好方面。在消费者行为研究中, 污染效应是指消费者会降低对他人接触过产品的感知价值。本研究主要回顾了在消费行为中污染效应的定义和特性, 然后从接触因素、位置因素、产品因素和社会因素等方面来探讨污染效应的前因, 并进一步归纳了污染效应对消费者行为的消极影响和积极影响。最后, 探讨了污染效应的理论基础和边界条件。在此基础上, 对污染效应在消费者行为领域的未来研究方向进行了展望。     

Appreciation of nature and appreciation of environmental protection: How stable are these attitudes and which comes first?

IntroductionAttitude toward nature and attitude toward environmental protection are two separate but correlated attitudes. Little is known about the two attitudes’ stability/volatility over time, despite the practical value of such knowledge.Objectives & methodUsing longitudinal survey data from 251 adults in a cross-lagged structural equation model, we assessed the degree of spontaneous (i.e., unprompted) change in the two attitudes. We also considered whether such change could provide evidence regarding causal direction; causation could go in either of two directions between the two attitudes, or it could even be bi-directional.ResultsWe corroborated the substantive connection between attitude toward nature and attitude toward environmental protection; however, the absence of change in the attitudes despite the passage of two years disallows reliable statements about causal direction.ConclusionIt is possible to protect the environment by encouraging appreciation of nature, but change in attitude toward nature and attitude toward environmental protection may be difficult to achieve with mature individuals.     

The modulating influence of category size on the classification of exception patterns

Generalization gradients to exception patterns and the category prototype were investigated in two experiments. In Experiment 1, participants first learned categories of large size that contained a single exception pattern, followed by a transfer test containing new instances that had a manipulated similarity relationship to the exception or a nonexception training pattern as well as distortions of the prototype. The results demonstrated transfer gradients tracked the prototype category rather than the feedback category of the exception category. In Experiment 2, transfer performance was investigated for categories varying in size (5, 10, 20), partially crossed with the number of exception patterns (1, 2, 4). Here, the generalization gradients tracked the feedback category of the training instance when category size was small but tracked the prototype category when category size was large. The benefits of increased category size still emerged, even with proportionality of exception patterns held constant. These, and other outcomes, were consistent with a mixed model of classification, in which exemplar influences were dominant with small-sized categories and/or high error rates, and prototype influences were dominant with larger sized categories.