Are transitions in human gait determined by mechanical,kinetic or energetic factors?

It is currently unclear whether it is the need to maintain metabolic efficiency, the need to keep skeletal loading below critical force levels, or simple mechanical factors that drive the walk-to-run (W-R) and run-to-walk (R-W) transitions in human gait. Eighteen adults (9 males and 9 females) locomoted on an instrumented treadmill using their preferred gait. Each completed 2 ascending (W-R) and 2 descending (R-W) series of trials under three levels of loading (0%, 15% and 30% body weight). For each trial, participants locomoted for 60 s at each of 9 different speeds--4 speeds both above and below their preferred transition speed (PTS) plus their PTS. Evidence was sought for critical levels of key kinetic (maximum vertical force, impulse, first peak force, time to first peak force and maximum loading rate), energetic (oxygen consumption, transport cost) and mechanical variables (limb lengths, strength) predictive of the gait transition. Analyses suggested the kinetic variables of time to first peak force and loading rate as the most likely determinants of the W-R and R-W transitions.     

Implicit self-esteem and social anxiety: differential self-favouring effects in high and low anxious individuals

This study was designed to investigate the role of negative self-image in social phobia. Participants were 19 high and 19 low socially anxious women. Because self-report measures of self-esteem are sensitive to self-presentation and impression management strategies, an implicit association test (IAT) was used to assess participants' self-esteem as well as their general evaluation of others ('other-esteem'). Socially anxious women displayed relatively low levels of self-esteem on self-report measures. However, at the implicit level, low and high anxious women were characterised by a similar, highly positive self-image. Both groups displayed a relatively low 'other-esteem'. Yet, this self-favouring effect was considerably weaker in high than in low anxious participants. The results provide no unequivocal support for the idea that low self-esteem plays an important role in social anxiety. Yet, rather than by low self-esteem per se, socially anxious people are characterised by a small discrepancy between esteem of self and others, and it may be this reduced tendency to self-favouring that is pivotal to social anxiety.     

The etiology of specific fears and phobias in children: a critique of the non-associative account

The non-associative account of phobic etiology assumes that a number of specific fears (e.g., fear of heights, water, spiders, strangers, and separation) have an evolutionary background and may occur in the absence of learning experiences (e.g., conditioning). By this view, these specific fears pertain to stimuli that once posed a challenge to the survival of our prehistoric ancestors. Accordingly, they would emerge spontaneously during the course of normal development and only in a minority of individuals, these specific fears would persist into adulthood. While the non-associative approach has generated interesting findings, several critical points can be raised. First, it capitalizes on negative findings, i.e., the failure to document learning experiences (e.g., conditioning, modeling) in the history of phobic children. Second, it largely ignores factors that have been found to be crucial for the acquisition of early childhood fears (e.g., the developmental level of the child, stimulus characteristics such as novelty, aversiveness, and unpredictability, and early experience with uncontrollable events). As an alternative to the non-associative account, we briefly describe a multifactorial model of childhood fears and phobias.     

Phobia-relevant illusory correlations: the role of phobic responsivity

The authors investigated the role of phobic responsivity in the generation of phobia-relevant illusory correlations. As a means of disentangling the contributions of prior fear and elicited fear responses, half of a group of phobic women received 1 mg alprazolam (n = 21), and half received a placebo (n = 22). A group of nonfearful women (n = 24) was included to control for prior fear per se. Participants were exposed to slides of spiders, weapons, and flowers that were randomly paired with a shock, a siren, or nothing. Postexperimental covariation estimates and on-line outcome expectancies were assessed. Irrespective of both prior and elicited fear, participants postexperimentally overassociated spiders and shock. Yet, only women with spider phobia displayed a persisting fear-confirming expectancy bias. This bias was similar for the placebo and alprazolam groups. Thus, the bias appeared to be due to preexisting phobogenic beliefs, whereas phobic responsivity played a negligible role.     

Hypochondriacs' estimation of negative outcomes: domain-specificity and responsiveness to reassuring and alarming information

Based on hypochondriacal patients' tendency to overestimate the seriousness of bodily sensations and health risks [Barsky, A. J., Wyshak, G. & Klerman, G. L. (1990). The Somatosensory Amplification Scale and its relationship to hypochondriasis. Journal of Psychiatric Research, 24, 323-334; Warwick, H. M. C., & Salkovskis, P. M. (1990). Hypochondriasis. Behaviour Research and Therapy, 28, 105-117], we investigated whether hypochondriacal individuals (n = 20) are inclined to report higher estimates of negative outcomes than healthy controls (n = 20) when interpreting ambiguous health-related and nonhealth-related events. In addition, we explored the influence of additional reassuring and alarming information on hypochondriacs' estimates of negative outcomes. Following the cognitive-behavioural model of hypochondriasis [Warwick, H. M. C. & Salkovskis, P. M. (1989). Hypochondriasis. In J. Scott, J. M. G. Williams & A. T. Beck (Eds.), Cognitive therapy in clinical practice: an illustrative casebook. (pp. 78-102). London: Routledge] we hypothesized that hypochondriacal individuals would be more responsive to alarming information and less responsive to reassuring information than healthy controls. Yet, hypochondriacs were neither found to be immune for reassuring information, nor to be hypersensitive to alarming information. Meanwhile, irrespective of the additional alarming or reassuring information, hypochondriacs clearly showed a domain-specific bias towards higher estimates of negative outcomes in ambiguous health-related situations.     

Disgust domains in the prediction of contamination fear

Previous research has shown a relationship between the emotion of disgust and the fear of contamination. Heightened sensitivity to disgust and increased concerns over contamination has been observed in various disorders, such as obsessive-compulsive disorder (OCD) and specific phobias. However, there is a paucity of research identifying the specific domains of disgust that contribute to contamination fear. The present study soughts to determine which domains of disgust elicitors reliably predict scores on a measure of OCD contamination obsessions and washing compulsions. We further conducted exploratory analyses that examined differences in disgust sensitivity among individuals classified as high and low in contamination fear. Three hundred and twenty-three undergraduate participants completed two measures of disgust sensitivity (Disgust Scale; Disgust Emotion Scale) and a measure of contamination fear (Padua inventory, contamination obsessions and washing compulsions subscale). Stepwise multiple regression analyses indicated that contamination fear was best predicted by seven different disgust domains, thereby suggesting that contamination fear is accounted for by generalized, rather than domain-specific, disgust elicitors. The categories of disgust that predicted contamination fear appeared to have an underlying commonality of threat of contagion. The relationship between fear of contamination and disgust sensitivity was more pronounced for animal reminder disgust elicitors as opposed to core disgust elicitors. Results also showed that individuals classified as high in contamination fear scored significantly higher than the low contamination fear group on all disgust domains. Clinical and research implications regarding the interrelationships between fear, disgust, and the fear of contamination are discussed.     

(Re) defining salesperson motivation: current status,main challenges,and research directions

The construct of motivation is one of the central themes in selling and sales management research. Yet, to-date no review article exists that surveys the construct (both from an extrinsic and intrinsic motivation context), critically evaluates its current status, examines various key challenges apparent from the extant research, and suggests new research opportunities based on a thorough review of past work. The authors explore how motivation is defined, major theories underpinning motivation, how motivation has historically been measured, and key methodologies used over time. In addition, attention is given to principal drivers and outcomes of salesperson motivation. A summarizing appendix of key articles in salesperson motivation is provided.     

Responsible Reporting: Neuroimaging News in the Age of Responsible Research and Innovation

Besides offering opportunities in both clinical and non-clinical domains, the application of novel neuroimaging technologies raises pressing dilemmas. ‘Responsible Research and Innovation’ (RRI) aims to stimulate research and innovation activities that take ethical and social considerations into account from the outset. We previously identified that Dutch neuroscientists interpret “responsible innovation” as educating the public on neuroimaging technologies via the popular press. Their aim is to mitigate (neuro)hype, an aim shared with the wider emerging RRI community. Here, we present results of a media-analysis undertaken to establish whether the body of articles in the Dutch popular press presents balanced conversations on neuroimaging research to the public. We found that reporting was mostly positive and framed in terms of (healthcare) progress. There was rarely a balance between technology opportunities and limitations, and even fewer articles addressed societal or ethical aspects of neuroimaging research. Furthermore, neuroimaging metaphors seem to favour oversimplification. Current reporting is therefore more likely to enable hype than to mitigate it. How can neuroscientists, given their self-ascribed social responsibility, address this conundrum? We make a case for a collective and shared responsibility among neuroscientists, journalists and other stakeholders, including funders, committed to responsible reporting on neuroimaging research.     

Some Implications of Believing That Happiness Involves the Absence of Pain: Negative Hedonic Beliefs Exacerbate the Effects of Stress on Well-Being

One common belief about happiness, espoused to varying degrees by both researchers and laypeople alike, is that happiness involves a lack of negative hedonic experiences. In the current investigation, we examine whether individual differences in endorsement of this belief, termed negative hedonic belief, moderate the effects of stress on happiness and several indicators of well-being. It was predicted that because stress involves the experience of negative hedonic states, increased stress would be more robustly associated with decreased happiness and well-being among those endorsing negative hedonic beliefs. Results from three studies utilizing both retrospective and prospective research designs generally support this prediction and suggest that endorsing the belief that happiness involves a lack of negative hedonic experiences is associated with more negative outcomes in response to the experience of heightened life stress.