Haag's theorem in renormalised quantum field theories

We review a package of no-go results in axiomatic quantum field theory with Haag's theorem at its centre. Since the concept of operator-valued distributions in this framework comes very close to what we believe canonical quantum fields are about, these results are of consequence to quantum field theory: they suggest the seeming absurdity that this highly victorious theory is incapable of describing interactions. We single out unitarity of the interaction picture's intertwiner as the most salient provision of Haag's theorem and critique canonical perturbation theory to argue that renormalisation bypasses Haag's theorem by violating this very assumption.Comment: 80 pages, 8 Feynman diagrams, 3 appendix section

Measuring individual differences in decision biases: methodological considerations

BACKGROUND: Individual differences in people’s susceptibility to heuristics and biases (HB) are often measured by multiple- bias questionnaires consisting of one or a few items for each bias. This research approach relies on the assumptions that (1) different versions of a decision bias task measure are interchangeable as they measure the same cognitive failure; and (2) that some combination of these tasks measures the same underlying construct. Based on these assumptions, in Study 1 we developed two versions of a new decision bias survey for which we modified 13 HB tasks to increase their comparability, construct validity, and the participants’ motivation. The analysis of the responses (N = 1279) showed weak internal consistency within the surveys and a great level of discrepancy between the extracted patterns of the underlying factors. To explore these inconsistencies, in Study 2 we used three original examples of HB tasks for each of seven biases. We created three decision bias surveys by allocating one version of each HB task to each survey. The participants’ responses (N = 527) showed a similar pattern as in Study 1, questioning the assumption that the different examples of the HB tasks are interchangeable and that they measure the same underlying construct. These results emphasize the need to understand the domain-specificity of cognitive biases as well as the effect of the wording of the cover story and the response mode on bias susceptibility before employing them in multiple-bias questionnaires

The Construal of Midwives by Pregnant Women with a Body Mass Index Greater Than or Equal to 30 kg/m2 (BMI ≥ 30 kg/m2): A Repertory Grid Study

Objective To explore the construal of midwives by pregnant women with a body mass index greater than 30 kg/m2 (BMI ≥ 30 kg/m2). Method Ten pregnant women with a BMI ≥ 30 kg/m2 were recruited from antenatal clinics at a maternity hospital in the North West of England. Each participant completed a repertory grid. The participants chose people to match roles including themselves, pregnant women, midwives of different BMIs and hypothetical elements. They also generated psychological constructs to describe them. Results Pregnant women with a BMI ≥ 30 kg/m2 construed themselves as vulnerable and self-conscious. Some women endorsed obesity-related stereotypes for themselves and felt responsible for their weight. The midwife with a BMI 18 < 30 kg/m2 was considered to be most similar to the ideal midwife, while the midwife with a BMI ≤ 18 kg/m2 was construed as having an undesirable interpersonal style. The midwife with a BMI ≥ 40 kg/m2 was often construed as sharing similar experiences to the pregnant women with a BMI ≥ 30 kg/m2, such as struggling with the psychological consequences of a raised BMI. Some women construed the midwife with a BMI 30 < 40 kg/m2 in a positive way, whereas others viewed it as sharing similar feelings about weight as the midwife with a BMI ≥ 40 kg/m2. Conclusions The pregnant women with a BMI ≥ 30 kg/m2 in this study described perceptions of themselves and the midwives responsible for their care, which may affect their engagement and satisfaction with services. Pregnant women with a BMI ≥ 30 kg/m2 should be involved in service development activities to ensure the structure of services and the language used by midwives are acceptable and do not confirm weight-related stereotypes. Copyright © 2016 John Wiley & Sons, Ltd. Key Practitioner Message Pregnant women with a BMI ≥ 30 kg/m2 construe themselves as vulnerable and self-conscious and perceive themselves responsible for their weight. Pregnant women with a BMI ≥ 30 kg/m2 construe midwives with a low BMI as having an undesirable, cold, interpersonal style. Midwives with a raised BMI are construed as similar to the women, because they share the uncomfortable psychological consequences of a raised BMI. The nature of pregnant women's construal may affect their engagement and satisfaction with maternity services and midwifery care

Development of intuitive rules: Evaluating the application of the dual-system framework to understanding children's intuitive reasoning

This is an author-created version of this article. The original source of publication is Psychon Bull Rev. 2006 Dec;13(6):935-53 The final publication is available at www.springerlink.com Published version: http://dx.doi.org/10.3758/BF0321390

Thinking styles and doctors' knowledge and behaviours relating to acute coronary syndromes guidelines

Background How humans think and make decisions is important in understanding behaviour. Hence an understanding of cognitive processes among physicians may inform our understanding of behaviour in relation to evidence implementation strategies. A personality theory, Cognitive-Experiential Self Theory (CEST) proposes a relationship between different ways of thinking and behaviour, and articulates pathways for behaviour change. However prior to the empirical testing of interventions based on CEST, it is first necessary to demonstrate its suitability among a sample of healthcare workers. Objectives To investigate the relationship between thinking styles and the knowledge and clinical practices of doctors directly involved in the management of acute coronary syndromes. Methods Self-reported doctors' thinking styles (N = 74) were correlated with results from a survey investigating knowledge, attitudes, and clinical practice, and evaluated against recently published acute coronary syndrome clinical guidelines. Results Guideline-discordant practice was associated with an experiential style of thinking. Conversely, guideline-concordant practice was associated with a higher preference for a rational style of reasoning. Conclusion Findings support that while guidelines might be necessary to communicate evidence, other strategies may be necessary to target discordant behaviours. Further research designed to examine the relationships found in the current study is required