Epistemic closure under deductive inference: what is it and can we afford it?

The idea that knowledge can be extended by inference from what is known seems highly plausible. Yet, as shown by familiar preface paradox and lottery-type cases, the possibility of aggregating uncertainty casts doubt on its tenability. We show that these considerations go much further than previously recognized and significantly restrict the kinds of closure ordinary theories of knowledge can endorse. Meeting the challenge of uncertainty aggregation requires either the restriction of knowledge-extending inferences to single premises, or eliminating epistemic uncertainty in known premises. The first strategy, while effective, retains little of the original idea—conclusions even of modus ponens inferences from known premises are not always known. We then look at the second strategy, inspecting the most elaborate and promising attempt to secure the epistemic role of basic inferences, namely Timothy Williamson’s safety theory of knowledge. We argue that while it indeed has the merit of allowing basic inferences such as modus ponens to extend knowledge, Williamson’s theory faces formidable difficulties. These difficulties, moreover, arise from the very feature responsible for its virtue- the infallibilism of knowledge.     

A pilot evaluation of the efficacy of a couple-tailored print intervention on colorectal cancer screening practices among non-adherent couples

The objective of this study was to evaluate the efficacy of a couple-tailored print (CTP) intervention on colorectal cancer screening (CRCS), CRCS intentions, and on knowledge and attitudes among couples in which neither partner is on schedule with regard to CRCS. A total of 168 married couples with both members non-adherent with CRCS were randomly assigned to receive either a CTP pamphlet accompanied by a generic print (GP) pamphlet or a GP pamphlet only. Couples completed measures of CRCS, intentions, relational perspective on CRCS, discussions about CRCS, spouse support for CRCS, spouse influence strategies, CRC knowledge, perceived CRC risk, and CRCS benefits and barriers. Results indicated there was no significant benefit of CTP vs. GP on CRCS, but there was a significant increase in CRCS intentions in CTP compared with GP. There was also a significant increase in relationship perspective on CRCS, a significant increase in husbands’ support of their wives’ CRCS, and a significant increase in CRCS benefits in CTP. In summary, CTP did not increase CRCS practices but increased intentions and perceived benefits of CRCS as well as improving couples’ ability to view CRCS as having benefit for the marital relationship.     

Robust tests of equivalence for k independent groups

A common question of interest to researchers in psychology is the equivalence of two or more groups. Failure to reject the null hypothesis of traditional hypothesis tests such as the ANOVA F‐test (i.e., H₀: μ₁ = … = μ_k) does not imply the equivalence of the population means. Researchers interested in determining the equivalence of k independent groups should apply a one‐way test of equivalence (e.g., Wellek, 2003). The goals of this study were to investigate the robustness of the one‐way Wellek test of equivalence to violations of homogeneity of variance assumption, and compare the Type I error rates and power of the Wellek test with a heteroscedastic version which was based on the logic of the one‐way Welch (1951) F‐test. The results indicate that the proposed Wellek–Welch test was insensitive to violations of the homogeneity of variance assumption, whereas the original Wellek test was not appropriate when the population variances were not equal.     

SURVIVORS OF THE HOLOCAUST AND THEIR CHILDREN

Despite the importance given in their narratives to the birth of their children and grandchildren, in most of the interviews I conducted with Holocaust survivors they do not discuss their children or family life in detail. Rather, for many of them, discussion is generally connected to how or what they have explained to their children about their experiences during the war. Survivors’ preoccupation with this issue could be understood as a response to the context in which they find themselves, in which a particular social discourse about survivors has developed. This discourse arguably engendered particular responses from survivors: it is a question that survivors expect to be asked, and it is seen as part of their prescribed role. Based on over 50 narrative interviews with survivors of the Holocaust, this article explores how survivors reflect and understand their parenting. It examines to what extent their behaviour has been influenced by their experiences during the war, or in reaction to a particular social discourse. Whilst literature on the second generation has been predominantly based on the responses of the children of survivors, this article provides important evidence of how survivors reflect on and understand their parenting.     

Reproducibility of functional network metrics and network structure: A comparison of task-related BOLD, resting ASL with BOLD contrast, and resting cerebral blood flow

Network analysis is an emerging approach to functional connectivity in which the brain is construed as a graph and its connectivity and information processing estimated by mathematical characterizations of graphs. There has been little to no work examining the reproducibility of network metrics derived from different types of functional magnetic resonance imaging (fMRI) data (e.g., resting vs. task related, or pulse sequences other than standard blood oxygen level dependent [BOLD] data) or of measures of network structure at levels other than summary statistics. Here, we take up these questions, comparing the reproducibility of graphs derived from resting arterial spin-labeling perfusion fMRI with those derived from BOLD scans collected while the participant was performing a task. We also examine the reproducibility of the anatomical connectivity implied by the graph by investigating test–retest consistency of the graphs’ edges. We compare two measures of graph-edge consistency both within versus between subjects and across data types. We find a dissociation in the reproducibility of network metrics, with metrics from resting data most reproducible at lower frequencies and metrics from task-related data most reproducible at higher frequencies; that same dissociation is not recapitulated, however, in network structure, for which the task-related data are most consistent at all frequencies. Implications for the practice of network analysis are discussed.     

The recognition of mental states from dynamic and static facial expressions

The ability to recognize mental states from facial expressions is essential for effective social interaction. However, previous investigations of mental state recognition have used only static faces so the benefit of dynamic information for recognizing mental states remains to be determined. Experiment 1 found that dynamic faces produced higher levels of recognition accuracy than static faces, suggesting that the additional information contained within dynamic faces can facilitate mental state recognition. Experiment 2 explored the facial regions that are important for providing dynamic information in mental state displays. This involved using a new technique to freeze motion in a particular facial region (eyes, nose, mouth) so that this region was static while the remainder of the face was naturally moving. Findings showed that dynamic information in the eyes and the mouth was important and the region of influence depended on the mental state. Processes involved in mental state recognition are discussed.     

Why won’t they participate? Barriers to participation in worksite health promotion programmes

Research suggests that worksite health promotion (WHP) programmes, and specifically health risk assessment (HRA) surveys and health education workshops, can be effective in enhancing employees’ health. However, 50–75% of employees choose not to participate when offered the opportunity to do so. The reasons for nonparticipation and the characteristics of nonparticipants have largely been overlooked. Building on premises of Conservation of Resources (COR) theory, we hypothesize that nonparticipation results from lack or loss of resources, or from the perceived low value of resources. These barriers to participation are expected to be related to employees’ characteristics and beliefs (termed implicit barriers) and reflected in employees’ self-reported reasons for nonparticipation (termed explicit barriers). We surveyed a large random sample of participants and nonparticipants in a WHP programme (n = 1926 employees), which included two steps: a HRA survey and a health education workshop. Participants completed an anonymous web-based questionnaire. Implicit and explicit barriers that reflect resource availability (e.g., age, health status) and valuation (e.g., low value of making a lifestyle change) were identified. The magnitude and nature of these barriers differed between the HRA survey and the workshop. We discuss how future research on WHP programmes can build on these findings and propose practical implications for reducing nonparticipation.     

Posttraumatic Growth and Subjective Well-Being among Caregivers of Chronic Patients: A Preliminary Study

This preliminary study focused on positive phenomena among Israeli family caregivers (spouse, adult child, or parent) of patients with chronic illness hospitalized in a medical rehabilitation hospital. We investigated these caregivers’ posttraumatic growth (PTG) and subjective well-being (positive and negative emotions, life satisfaction), and their associations with the demographic and illness characteristics of the caregivers and patients, respectively. Participants included 74 adult primary caregivers: 28 were the patient’s spouse; 21 were the patient’s child; and 25 were the patient’s parent. Caregivers completed four self-report questionnaires. No significant association emerged between caregivers’ PTG and their negative affect or life satisfaction. Nevertheless, caregivers’ positive affect correlated with their PTG and also predicted it. Moreover, different patterns emerged for the caregiver subgroups (spouse, adult child, or parent): Patients’ children reported lower negative affect and greater life satisfaction than patients’ parents or spouses. Various explanations were discussed, alongside implications for giving recognition and assistance from the medical system to patients’ caregivers.     

Correlates of colorectal cancer screening compliance and stage of adoption among siblings of individuals with early onset colorectal cancer.

Concepts from the health belief, transtheoretical, and dual process models were used to examine how siblings of individuals diagnosed with colorectal cancer (CRC) before age 56 made decisions about CRC screening. Siblings (N = 504) were assessed for CRC screening practices and intentions, pros, cons, processes-of-change, perceived risk of CRC, perceived severity of CRC, preventability of CRC, cancer-related distress, and sibling relationship closeness. Physician and family recommendation and knowledge were also assessed. Fifty-seven percent of participants (n = 287) were compliant with CRC screening. Logistic regression indicated that perceived pros and cons, perceived risk, commitment to screening, health care avoidance, and sibling closeness were associated with screening compliance. Physician and family recommendation were also strong correlates. A similar set of factors was associated with stage of adoption of CRC screening.     

The role of perseveration in children's symbolic understanding and skill

In the first few years of life, children become increasingly sensitive to the significance of a variety of symbolic artifacts. An extensive body of research has explored very young children's ability to use symbol‐based information as a guide to current reality. In one common task, for example, children watch as a miniature toy is hidden in a scale model, and are then asked to retrieve a larger version of the toy from the corresponding place in the room itself. Two‐and‐a‐half‐year‐old children perform very poorly in most versions of this task. Their most common error is to perseverate; that is, they search again at the location where the toy was last hidden. Two studies examined the degree to which 2¹/₂‐year‐olds’ high rate of perseveration and poor performance stem from problems with inhibitory control. Results showed that problems with inhibitory control contribute very little to 2¹/₂‐year‐old children's difficulty with the task. Instead, the results confirm young children's great difficulty appreciating and exploiting symbol–referent relations.