Decision speed induces context effects in choice

The context in which a decision occurs can influence the decision-making process in many ways. In the laboratory, this is often evident in the effects of recent decisions. For instance, many experiments combine easy and difficult decisions, such as when word frequency is manipulated in lexical decision. The "blocking effect" describes how such decisions differ depending on whether the conditions are presented in pure blocks (comprised purely of easy or hard stimuli) or mixed blocks (also known as a "mixing cost"). We present a novel extension to these context effects, demonstrating in two experiments that they can be induced using conditions with identical difficulty, but different timing properties. This suggests that explanations of context effects based on task difficulty or error monitoring alone might be insufficient, and suggest a role for decision time. In prior work, we suggested such a hypothesis under the assumption that observers minimize their decision time, subject to an accuracy constraint. Consistent with this explanation, we find that decisions in slower conditions were based on less evidence when they were experienced in mixed compared to pure blocks.     

Context effects in multi-alternative decision making: empirical data and a Bayesian model

For decisions between many alternatives, the benchmark result is Hick's Law: that response time increases log-linearly with the number of choice alternatives. Even when Hick's Law is observed for response times, divergent results have been observed for error rates-sometimes error rates increase with the number of choice alternatives, and sometimes they are constant. We provide evidence from two experiments that error rates are mostly independent of the number of choice alternatives, unless context effects induce participants to trade speed for accuracy across conditions. Error rate data have previously been used to discriminate between competing theoretical accounts of Hick's Law, and our results question the validity of those conclusions. We show that a previously dismissed optimal observer model might provide a parsimonious account of both response time and error rate data. The model suggests that people approximate Bayesian inference in multi-alternative choice, except for some perceptual limitations.     

Integrating Cognitive Process and Descriptive Models of Attitudes and Preferences

Discrete choice experiments—selecting the best and/or worst from a set of options—are increasingly used to provide more efficient and valid measurement of attitudes or preferences than conventional methods such as Likert scales. Discrete choice data have traditionally been analyzed with random utility models that have good measurement properties but provide limited insight into cognitive processes. We extend a well‐established cognitive model, which has successfully explained both choices and response times for simple decision tasks, to complex, multi‐attribute discrete choice data. The fits, and parameters, of the extended model for two sets of choice data (involving patient preferences for dermatology appointments, and consumer attitudes toward mobile phones) agree with those of standard choice models. The extended model also accounts for choice and response time data in a perceptual judgment task designed in a manner analogous to best–worst discrete choice experiments. We conclude that several research fields might benefit from discrete choice experiments, and that the particular accumulator‐based models of decision making used in response time research can also provide process‐level instantiations for random utility models.     

Canaries in the coalmine: On the measurement and correlates of organizational threat recognition

This research expands the job performance domain by introducing organizational threat recognition as a meaningful criterion construct. Threat recognition is conceptualized as consisting of two separate aspects of behaviour—detecting and expressing workplace or organizational threats. To assess these dimensions, we developed two, six-item measures and had 244 workers respond to these items and to a series of individual difference measures. Psychometric results, including exploratory and confirmatory factor analyses, supported the a priori factor structure of these measures and indicated that these dimensions are distinguishable from each other and from task performance. Furthermore, correlations involving the individual difference variables revealed that several of these variables including positive affectivity, job tenure, and affective commitment were more strongly related to the threat dimensions than to task performance.     

Spatial cognition and perseveration by horses, donkeys and mules in a simple A-not-B detour task

We investigated perseveration and detour behaviour in 36 equids (Equus caballus, E. asinus, E. caballus × E. asinus) and compared these data to those of a previous study on domestic dogs (Canis familiaris). The animals were required to make a detour through a gap at one end of a straight barrier in order to reach a visible target. After one, two, three or four repeats (A trials), the gap was moved to the opposite end of the barrier (B trials). We recorded initial deviations from the correct solution path and the latency to crossing the barrier. In the A trials, mules crossed the barrier significantly faster than their parental species, the horses and donkeys. In the B trials, following the change of gap location, all species showed a reduction in performance. Both dogs and horses exhibited significant spatial perseveration, going initially to the previous gap location. Donkeys and mules, however, performed at chance level. Our results suggest that hybrid vigour in mules extends to spatial abilities.     

What Really Happened: A Tribute to John C. Fletcher

John C. Fletcher, a pioneer in the field of bioethics and friend and mentor to many generations of bioethicists, died tragically on May 27th at the age of 72. The son of an Episcopal priest from Bryan, TX, Fletcher graduated in 1953 with a degree in English Literature from the University of the South in Sewanee, TN. After completing a Masters in Divinity degree from the Virginia Theological Seminary and a stint as a Fulbright scholar at the University of Heidelberg in 1956, he was ordained in the Episcopal Church and received a doctorate in Christian ethics from the Union Theological Seminary in New York. After ordination, Fletcher worked in various Episcopal churches and founded the Interfaith Metropolitan Theological Seminary in Washington, D.C. However, despite his religious faith, he was also a skeptic, and renounced his ordination in the mid-1990s due to his need for ‘intellectual honesty.’

Fletcher began his bioethics contributions in the early 1970's, when he became a founding Fellow of the Hastings Center and eventually the first Chief of the Bioethics Program at the Clinical Center of the National Institutes of Health. At the University of Virginia in Charlottesville, he was the Founding Director of the Center for Bioethics and a professor of biomedical ethics at the medical school, and became the Kornfeld Professor of Biomedical Ethics until his retirement in 1999. Fletcher was a prominent authority and voice in the national and international bioethical dialogue through his talks, his testimonies before scientific and congressional panels, his many articles, and his bioethical and religiously-orientated books, including: An Introduction to Clinical Ethics (1997), Coping with Genetic Disorders: a Guide for Clergy and Parents (1982), Ethics and Human Genetics: A Cross-Cultural Perspective (1989), which he wrote with sociologist Dorothy C. Wertz. Dr. Fletcher received the Lifetime Achievement Award from the American Society of Bioethics and Humanities in 2000. With the passing of Dr. John C. Fletcher, bioethics has lost one of its great voices, a dedicated teacher and mentor, and a friend and colleague to scholars in bioethics and a host of other fields. Below is a touching tribute from one of his former students.     

The Orthodox Church and Commercial Fortune-Telling and Magic in Russia

Abstract

Based on field work in St Petersburg and supplemented by a range of other sources and material, the article examines the vibrant and visible market for commercial fortune-telling and magic in postsoviet Russia and its relationship with the Moscow Patriarchate. It opens with an estimate of the relative strength of belief in the occult and in Orthodoxy, noting that though large numbers claim to be Orthodox, many do not commit to a Christian life or even to the basic tenets of the Orthodox faith. Others mix Orthodox and heterodox religious attitudes eclectically. Belief in magic and fortune-telling is strongest among members of these two large groups, which indicates a magico-religious mindset that perceives their personal troubles as externally caused. Examining the placatory attitude of magic specialists to the Russian Orthodox Church, I argue that, given the overlap with services offered by the Church (rituals to cure alcoholism and addiction, for example), magic specialists are in direct competition with the Patriarchate. Combating their influence has been hampered by a series of factors. Teaching Orthodox believers to distinguish between magic and religion is made more difficult by the Patriarchate's own promotion of wonder-working sites and shrines. Furthermore, its campaign against occultism has until recently paid scant attention to everyday magic and fortune-telling, concentrating instead on external evil in the form of cults and sects. Where it did turn its attention in this direction, it tended to brand magic and fortune-telling as demonic, a characterisation likely to be effective only with those who believe in the devil. Recently, there are indications of a change of tack, but it is unclear how successful the new campaign will be.     

The Nonhuman Environment in Normal Development and in Schizophrenia by Harold F. Searles

Abstract

Somatic psychology, the interplay of the body, the mind, the emotions, and the social context, significantly contributes to the theory and practice of group therapy. The processing of sensory experiences in the here-and-now of the therapy group helps group members to develop self-awareness, the ability to understand their relationships with others, and the capacity for empathy. When group members know what they experience, they can understand how others feel and resonate emotionally with those feelings. Neurobiology, sensory processing, and attachment theories help us to understand how the sense of self develops somatically. Principles of somatic therapies are applied to group therapy practice in working with attachment disorders, transference impasse, and trauma. The importance and implications of the group therapist’s embodied attunement are explored.     

Effects of Interpretation Training on Hostile Attribution Bias and Reactivity to Interpersonal Insult

Research suggests that individuals high in anger have a bias for attributing hostile intentions to ambiguous situations. The current study tested whether this interpretation bias can be altered to influence anger reactivity to an interpersonal insult using a single-session cognitive bias modification program. One hundred thirty-five undergraduate students were randomized to receive positive training, negative training, or a control condition. Anger reactivity to insult was then assessed. Positive training led to significantly greater increases in positive interpretation bias relative to the negative group, though these increases were only marginally greater than the control group. Negative training led to increased negative interpretation bias relative to other groups. During the insult, participants in the positive condition reported less anger than those in the control condition. Observers rated participants in the positive condition as less irritated than those in the negative condition and more amused than the other two conditions. Though mediation of effects via bias modification was not demonstrated, among the positive condition posttraining interpretation bias was correlated with self-reported anger, suggesting that positive training reduced anger reactivity by influencing interpretation biases. Findings suggest that positive interpretation training may be a promising treatment for reducing anger. However, the current study was conducted with a non-treatment-seeking student sample; further research with a treatment-seeking sample with problematic anger is necessary.     

Variables Influencing Pregnancy Termination Following Prenatal Diagnosis of Fetal Chromosome Abnormalities

The objective of this study was to identify variables that may influence the decision to terminate or continue a pregnancy affected by a chromosome abnormality. We performed a retrospective cohort analysis of 286 pregnancies diagnosed with a chromosome abnormality following genetic counseling and prenatal diagnosis. Data obtained included procedure type, chromosome results, ethnicity, maternal age, use of fertility treatments, and uptake of genetic counseling after results, among other factors. Wilcoxon rank sum test, Fisher’s exact test, and univariate and multivariate logistic regression models were used for data analysis. The overall termination rate in this study was 82.9 %. A lower likelihood to terminate was found in pregnancies with a diagnosis of a sex chromosome abnormality (OR 0.05, p?<?.0001), Filipina race (OR 0.10, p?=?.03), and uptake of second genetic counseling session (OR 0.05, p?<?.0001). Prior history of termination was associated with increased likelihood to terminate (OR 8.6, p?=?.02). Factors revealing no statistically significant association with termination included maternal age, gestational age, clinic site, fetal gender, ultrasound anomalies, reason for referral and who informed the patient. Our data affirm the complexity of the decision making process and reinforce that providers should refrain from making assumptions regarding a patient’s likelihood to terminate based on factors such as maternal age, gestational age, type of procedure, or ultrasound.