David D. Clarke

Contrast sensitivity and visual disability in chronic simple glaucoma

A battery of vision tests was used to quantify visual defect in a group of 50 patients with chronic simple glaucoma. The vision tests were near and distance visual acuity, visual fields, and contrast sensitivity to static and temporally modulated sinusoidal grating patterns. Of these, static contrast sensitivity function appears to be the most sensitive method of measuring visual defect in glaucoma patients. The visual disability experienced by the glaucoma patients was quantified by means of a questionnaire, and the relationship between perceived visual disability and visual defect was examined. It was found that results from a group of tests, near visual acuity, visual field, and contrast sensitivity measures, are the best predictors of the difficulty experienced by patients in performing visually dependent daily activities.

Effect of age on contrast sensitivity function: uniocular and binocular findings.

Monocular and binocular contrast sensitivity function for a range of spatial frequencies was measured in two groups of subjects with normal vision. Statistically significant differences in performance between the younger group (age 20-30 years) and the older group (age 50-87 years) were found at all spatial frequencies sampled between 0.40 and 19 X 25 cpd. In the age range 50-87 years there was a linear decline in contrast sensitivity with age for medium and high spatial frequencies, but sensitivity for low spatial frequencies was independent of age.

An application of the theory of planned behaviour to truck driving behaviour and compliance with regulations

A questionnaire study was conducted with truck drivers to help understand driving and compliance behaviour using the theory of planned behaviour (TPB). Path analysis examined the ability of the TPB to explain the direct and indirect factors involved in self-reported driving behaviour and regulation compliance. Law abiding driving behaviour in trucks was related more to attitudes, subjective norms and intentions than perceived behavioural control. For compliance with UK truck regulations, perceived behavioural control had the largest direct effect. The differing results of the path analyses for driving behaviour and compliance behaviour suggest that any future interventions that may be targeted at improving either on-road behaviour or compliance with regulations would require different approaches.

Investigating the predictive validity of implicit and explicit measures of motivation on condom use, physical activity and healthy eating

The literature on health-related behaviours and motivation is replete with research involving explicit processes and their relations with intentions and behaviour. Recently, interest has been focused on the impact of implicit processes and measures on health-related behaviours. Dual-systems models have been proposed to provide a framework for understanding the effects of explicit or deliberative and implicit or impulsive processes on health behaviours. Informed by a dual-systems approach and self-determination theory, the aim of this study was to test the effects of implicit and explicit motivation on three health-related behaviours in a sample of undergraduate students (N = 162). Implicit motives were hypothesised to predict behaviour independent of intentions while explicit motives would be mediated by intentions. Regression analyses indicated that implicit motivation predicted physical activity behaviour only. Across all behaviours, intention mediated the effects of explicit motivational variables from self-determination theory. This study provides limited support for dual-systems models and the role of implicit motivation in the prediction of health-related behaviour. Suggestions for future research into the role of implicit processes in motivation are outlined.

Temporal architecture of violent incidents.

Five hundred five reports of violent incidents in British pubs and bars were studied by using logical pathway modeling to provide information on the processes underlying work-related violence. Logical pathway modeling is innovative in examining and mapping sequences in real incidents at a population level. The data reveal the most common pathway to be misbehavior by customers, intervention by staff (before any physically violent act), physical attack on staff, and injury to staff. The data also highlight the likelihood of further action after assailants have exited and identify stages in incidents at which most staff and customer injuries and damage to property occur. Results assist in the design of strategies to reduce the risk from future violence, particularly by training staff to recognize and to handle potentially violent situations and to maintain vigilance and security following problem incidents.

Language, Action, and Context the Early History of Pragmatics in Europe and America, 1780-1930

The roots of pragmatics reach back to Antiquity, especially to rhetoric as one of the three liberal arts. However, until the end of the 18th century proto-pragmatic insights tended to be consigned to the pragmatic, that is rhetoric, wastepaper basket and thus excluded from serious philosophical consideration. It can be said that pragmatics was conceived between 1780 and 1830 in Britain, but also in Germany and in France in post-Lockian and post-Kantian philosophies of language. These early ‘conceptions’ of pragmatics are described in the first part of the book. The second part of the book looks at pragmatic insights made between 1830 and 1880, when they were once more relegated to the philosophical and linguistic underground. The main stage was then occupied by a fact-hunting historical comparative linguistics on the one hand and a newly spiritualised philosophy on the other. In the last part the period between 1880 and 1930 is presented, when pragmatic insights flourished and were sought after systematically. This was due in part to a new upsurge in empiricism, positivism and later behaviourism in philosophy, linguistics and psychology. Between 1780 and 1930 philosophers, psychologists, sociologists and linguists came to see that language could only be studied in the context of dialogue, in the context of human life and finally as being a kind of human action itself.

Anatomy of a media event: How arguments clashed in the 2001 human cloning debate

This paper studies the distinctive role that staged media events play in the public understanding of genetics: they can focus the attention of the media, scientists and the public on the risks and benefits of genetic advances, in our case, cloning; they can accelerate policy changes by exposing scientific, legal and ethical uncertainties; the use of images, metaphors, cliche´s and cultural narratives by scientists and the media engaged in this event can reinforce stereotypical representations of cloning, but can also expose fundamental clashes in arguments about cloning. The media event staged by two fertility experts in 2001 is here analysed as a case study.

Bedroom Rape: Sequences of Sexual Behavior in Stranger Assaults

This article examines the sequential, temporal, and interactional aspects of sexual assaults using sequential analysis. Fourteen statements taken from victims of bedroom-based assaults were analyzed to provide a comprehensive account of the behavioral patterns of individuals in sexually charged conflict situations. The cases were found to vary in the sexual severity of assault, distinguishing a variety of motivations and behavioral repertoires of offender and victim. Two quite distinct styles of offense were identified: multiple and single, which may have very different implications for research into rapist taxonomies and rape prevention strategies.

Identifying barriers to help-seeking: a qualitative analysis of students' preparedness to seek help from tutors

Abstract A qualitative study based on the first-hand accounts of students in higher education was conducted Participants were encouraged to explain, in their own terms, their own help-seeking behaviour. The focus for their explanations was ‘help-seeking from academic staff’. The aim of the study was to construct a culturally sensitive account of barriers to help-seeking in a student population. The discussion focuses on how studies of this kind might complement and extend what is already known about help-seeking m the extant literature.

The predictive validity of implicit measures of self-determined motivation across health-related behaviours

OBJECTIVE Research on health-related behaviour has typically adopted deliberative models of motivation and explicit measures. However, growing support for implicit processes in motivation and health-related behaviour has caused a shift towards developing models that incorporate implicit and explicit processes. METHODS The current research advances this area by comparing the predictive validity of a newly developed implicit measure of motivation from self-determination theory (SDT) with explicit measures of motivation for 20 health-related behaviours, in a sample of undergraduate students (N= 162). A dual systems model was developed to test whether implicit motivation provided unique prediction of behaviour. RESULTS Structural equation models for each behaviour indicated some support for the role of implicit measures; explicit measures and intention provided more consistent, significant prediction across most behaviours. CONCLUSIONS This study provides some support for dual systems models, and offers an important contribution to understanding why some behaviours may be better predicted by either implicit or explicit measures. Future implications for implicit processes and SDT are outlined. STATEMENT OF CONTRIBUTION WHAT IS ALREADY KNOWN ON THIS SUBJECT? : Previous research has highlighted the unique effects of implicit processes on goal-directed behaviour. Several studies have supported the role of implicit processes in motivation. WHAT DOES THIS STUDY ADD? : The current study adds to the previous literature by investigating the role of implicit processes and self-determination theory. Furthermore, the current study uses a relatively novel implicit measure across a wide range of behaviours. Finally, the current study incorporates a dual-systems model to provide a conceptual understanding of the findings.