The sunk cost effect with pigeons: some determinants of decisions about persistence

The sunk cost effect occurs when an individual persists following an initial investment, even when persisting is costly in the long run. The current study used a laboratory model of the sunk cost effect. Two response alternatives were available: Pigeons could persist by responding on a schedule key with mixed ratio requirements, or escape by responding on a second key. In Experiment 1, mean response requirements for persistence and escape were varied across conditions. Pigeons persisted (committing the sunk cost error) when persisting increased the mean response requirement only slightly but not when persisting was sufficiently nonoptimal. Experiment 2 explored more systematically combinations of ratios and probabilities assigned to the schedule key. Persistence varied with the ratio of the mean global response requirements for persistence and escape. In Experiment 3, transitions between ratios were signaled. This reduced nonoptimal persistence, and produced some instances of a reverse sunk cost error--escaping when persistence was optimal. In Experiment 4, it was optimal to escape after the second-smallest ratio ever presented. Pigeons escaped at approximately the optimal juncture, especially in conditions with added signals. Overall, this series of experiments suggests that the sunk cost error may arise in part because persistence is the default behavioral strategy in situations where the contingencies for escape and persistence are insufficiently disparate and/or it is relatively difficult to discriminate when to escape. The study also demonstrates the utility of animal models of complex decision making situations.     

Explaining Own and Others' Behavior in a Controversial Issue: Animal Experimentation

Abstract

The authors investigated how 2 groups with different attitudes toward animal experimentation–researchers who conducted animal experiments and members of animal welfare organizations who protested against animal experiments–made attributions for the behavior of the opposing group. The 2 groups showed an actor-observer effect, mentioning more internal causes for the opponents' behavior and more external causes for their own behavior. Both groups were able to take the other's perspective, resulting in a reversed actor-observer effect. The less involved participants followed the pattern of ratings of the group whose attitudes corresponded to their own. In particular, the participants with a negative attitude toward animal experimentation rated researchers' behavior as more internally caused than did those with a positive attitude. The results illustrated how the participants formed and defended attitudes in a social context.     

Contrast Effects in Judgments of Health Hazards

Abstract

Researchers commonly use 2 models to explain contrast effects (CEs): the standard-of-comparison model and the set-reset model. The 2 models focus on the role of categorization to predict when a CE (instead of an assimilation effect) will happen, while minimizing the role of knowledge accessibility and relevance in determining whether any effect will occur. A 3rd model, the selective-accessibility model (F. Strack & T. Mussweiler, 1997), focuses on knowledge accessibility and relevance, but it is a model of assimilation effects in the anchoring bias. In the present study of CEs, the authors tested 3 predictions implied by the selective-accessibility model. The authors found a CE only when anchor- and target-rating dimensions matched and only in the 1 st of multiple targets rated. The CE required a minimum amount of attention to the anchor. These results support the account that selective knowledge accessibility and relevance play an important role in CEs.     

Public Reactions to Unusual Names

Abstract

A sample of lower income Blacks, lower income Whites, higher income Blacks, and higher income Whites in the United States were asked about children's first names, the reasons the names were selected, and the identity of the persons who named the children. The most frequent reason for naming children in all four groups was “I/we just liked it.” The Whites were more likely than the Blacks to have named the child after a family member. Shoppers were then asked to rate the unusual names, along with a random sample of usual names, on six attributes: successful, moral, healthy, warm, cheerful, and gender appropriate. The shoppers were divided into eight groups in a two-income levels, two sexes, and two races design. The ratings were higher for usual names for all six attributes for all eight groups of raters. Although the unusual names had negative connotations for a wide variety of people in the community, name choices were usually the result of parents' current nonrational preferences.     

Romantic jealousy and implicit and explicit self-esteem

Research on romantic jealousy and self-esteem mostly relies on the measurement of explicit (i.e., conscious, deliberate) aspects, without taking recent developments of the measurement of implicit (i.e., automatic) aspects into account. In this study (N = 154), we applied several measures of romantic jealousy and self-esteem (explicit, implicit), finding sex-specific as well as measurement-specific effects. Men (but not women) higher in jealousy had lower explicit self-esteem, whereas women (but not men) higher in jealousy had higher implicit self-esteem, but only when using the Implicit Association Test (whereas not the Initial Preference Task) for measuring implicit self-esteem. Individuals with damaged (i.e., low explicit and high implicit) self-esteem were more jealous than those with fragile (i.e., high explicit and low implicit) self-esteem. This differential effect was due to higher implicit self-esteem among women, whereas lower explicit self-esteem among men. These novel findings not only add to the expanding literature on romantic jealousy research, but also to research on self-esteem discrepancies.     

Social desirability, personality questionnaires, and the “better than average” effect

It is well established that respondents are much more likely to rate themselves highly on personality questionnaire items with high social desirability (SD) than on items with low SD. However, conflicting explanations have been offered for this phenomenon. In the present study, 286 participants were randomly assigned to four groups that rated 119 items from two well-known personality questionnaires. One group of participants rated themselves, a second group rated their family and friends, a third rated “people in general,” and a fourth rated the items’ SD. It was found that mean SD ratings of personality items were highly correlated with mean self-ratings and with mean ratings of family and friends for the same items (all rs > .800), but not with mean ratings of “people in general.” In other words, participants strongly tended to rate themselves, their family, and their friends as high on socially desirable qualities, but this tendency did not extend to ratings of people in general. These results support the conclusion that respondents’ personality ratings of themselves, their family and friends, but not of people in general, are influenced by the form of self-serving bias known as the “better than average effect.”     

Decreased functional brain activation in Friedreich ataxia using the Simon effect task

The present study applied the Simon effect task to examine the pattern of functional brain reorganization in individuals with Friedreich ataxia (FRDA), using functional magnetic resonance imaging (fMRI). Thirteen individuals with FRDA and 14 age and sex matched controls participated, and were required to respond to either congruent or incongruent arrow stimuli, presented either to the left or right of a screen, via laterally-located button press responses. Although the Simon effect (incongruent minus congruent stimuli) showed common regions of activation in both groups, including the superior and middle prefrontal cortices, insulae, superior and inferior parietal lobules (LPs, LPi), occipital cortex and cerebellum, there was reduced functional activation across a range of brain regions (cortical, subcortical and cerebellar) in individuals with FRDA. The greater Simon effect behaviourally in individuals with FRDA, compared with controls, together with concomitant reductions in functional brain activation and reduced functional connectivity between cortical and sub-cortical regions, implies a likely disruption of cortico-cerebellar loops and ineffective engagement of cognitive/attention regions required for response suppression.     

小学生同伴接纳对其人格发展的影响：友谊质量的多层级中介效应

以班级为单位选取1-6年级23个班级的小学生,通过最好朋友提名法,得到有互选朋友有效被试700人,采用同伴提名法、小学生友谊质量问卷、小学生人格发展教师评定问卷,运用多层线性模型（HLM）考察个体和班级两个水平上的同伴接纳、友谊质量对人格的影响,并在两个水平上检验友谊质量在同伴接纳对人格的影响上的多层中介效应。结果表明：（1）班级水平：班级平均友谊质量对外倾性、亲社会性、认真自控、情绪稳定性有预测作用;班级平均同伴接纳对情绪稳定性有预测作用。（2）个体水平：同伴接纳对人格5个维度均有直接影响;除情绪稳定性,友谊质量分别在同伴接纳对智能特征、外倾性、亲社会性、认真自控影响上有部分中介效应。     

外倾个体何以有更多正性情绪体验？——情绪调节自我效能感的中介作用

通过对1076名大学生进行人格特质(外倾和神经质)、情绪调节自我效能感和情绪体验的测查,本研究探讨了外倾和神经质影响情绪的可能机制。结果表明：(1) 情绪调节自我效能感与外倾和神经质之间有紧密联系;(2) 外倾与情绪调节自我效能感可以有效预测个体正性情绪的变异;(3) 外倾对正性情绪的影响部分是以情绪调节自我效能感为中介的。该发现对实践中提升个体情绪调节自我效能感、改善情绪状态并最终优化人格结构具有重要启示。     

听觉通道下负数的低水平加工引起注意的SNARC效应

采用刺激探测任务,探讨了听觉通道下负数的低水平加工能否引起注意的SNARC效应。结果表明:(1)负数的低水平加工能够产生注意的SNARC效应,即线索为绝对值小的负数时,被试对左耳目标反应更快;线索为绝对值大的负数时,被试对右耳目标反应更快。(2)负数的加工所引起听觉空间注意的转移并不依赖于负数所在的情境,而仅通过其绝对值大小与空间表征发生关联。这一结论与视觉条件下所得到的结论不一致,并支持了系统发生论假说。