Driver behaviour with adaptive cruise control

This paper reports on the evaluation of adaptive cruise control (ACC) from a psychological perspective. It was anticipated that ACC would have an effect upon the psychology of driving, i.e. make the driver feel like they have less control, reduce the level of trust in the vehicle, make drivers less situationally aware, but workload might be reduced and driving might be less stressful. Drivers were asked to drive in a driving simulator under manual and ACC conditions. Analysis of variance techniques were used to determine the effects of workload (i.e. amount of traffic) and feedback (i.e. degree of information from the ACC system) on the psychological variables measured (i.e. locus of control, trust, workload, stress, mental models and situation awareness). The results showed that: locus of control and trust were unaffected by ACC, whereas situation awareness, workload and stress were reduced by ACC. Ways of improving situation awareness could include cues to help the driver predict vehicle trajectory and identify conflicts

Farmers, farm workers and work-related stress

This research explores the ways in which stress affects farming communities, how this has changed in recent years, and the degree to which work-related aspects of stress may be assuaged by support interventions. A qualitative case study research approach was employed to address these issues, involving 60 interviews in five locations across England and Wales.In examining farming stress, a distinction is made between its intrinsic, extrinsic and workrelated dimensions. Whileinterviewees tended to associate day-to-day worries and acute stress with farming’s intrinsic demands (such as disease and adverse weather conditions), external causes of tension (such as competition and regulation), together with worries about finances and family, were associated with more sustained anxieties. By contrast, work-related aspects of farming stress, such as workload issues and farming practices, involved a combination of physical and mental health effects.Notably, work-related and extrinsic dimensions of stress have increased in recent years in relation to organisational and policy shifts, price fluctuations, mounting paperwork demands, workload intensification, and changes in agricultural regulation. These have prompted an escalation in the aspects of their work that farming communities feel powerless to control, and represent a major area for policy intervention. Principal farmers displayed the most visible manifestations of stress, linked at once to the intrinsic, extrinsic and workrelated dimensions of their work. By contrast, family farm workers and labourers often lacked autonomy over the way they worked, and work-related aspects of stress concerning workload and organisation made up a greater part of their experience. Increased paperwork demands emerged as a major cause of stress among interviewees, particularly forfarmers and their wives, who struggled to balance these with traditional farming priorities. Differences between farmswere also influential in explaining stress. Livestock farming embodied intrinsic pressures relating to stock crises and the unpredictability of animals, but more recently has come under intense economic pressure, prompting a rationalisation of working practices. Arable farmers found the organisation of activities, such as harvesting and planting, in a context of reduced and increasingly contractual workforces particularly challenging. Mixed farmers faced the dual stresses of balancing work activities with conflicting timetables, and the paperwork demands of a complex portfolio of farming. Smaller farms were struggled with intensified workloads, while larger enterprises had to comply with the demands of more inspection regimes.Support agencies need to overcome the stigma attached to asking for help among farming communities and offer a rangeof responsive and proactive services. Locally based support was more likely to be used and trusted, although concernsabout client confidentiality might deter those most in need from seeking help. Where existing local networks wereestablished, there was a strong argument for providers to plug into these and work towards publicising their efforts to ensure that support is provided most effectively. Critically, support must be multidimensional, reflecting the wide range of stressors and their impacts among farming communities

Detecting short periods of elevated workload. A compari­son of nine workload assessment techniques

The present experiment tested the merits of 9 common workload assessment techniques with relatively short periods of workload in a car-driving task. Twelve participants drove an instrumented car and performed a visually loading task and a mentally loading task for 10, 30, and 60 s. The results show that 10-s periods of visual and mental workload can be measured successfully with subjective ratings and secondary task performance. With respect to longer loading periods (30 and 60 s), steering frequency was found to be sensitive to visual workload, and skin conductance response (SCR) was sensitive to mental workload. The results lead to preliminary guidelines that will help applied researchers to determine which techniques are best suited for assessing visual and mental workload

Catastrophe Models for Cognitive Workload and Fatigue

We reconceptualised several problems concerning the measurement of cognitive workload – fixed versus variable limits on channel capacity, work volume versus time pressure, adaptive strategies, resources demanded by tasks when performed simultaneously, and unclear distinctions between workload and fatigue effects – as two cusp catastrophe models: buckling stress resulting from acute workload, and fatigue resulting from extended engagement. Experimental participants completed a task that was intensive on non-verbal episodic memory and had an automatically speeded component. For buckling stress, the epoch of maximum (speeded) performance was the asymmetry parameter; however, anxiety did not contribute to bifurcation as expected. For fatigue, the bifurcation factor was the total work accomplished, and arithmetic, a compensatory ability, was the asymmetry parameter; R2 for the cusp models outperformed the linear comparison models in both cases. A research programme is outlined that revolves around the two models with different types of task and resource configurations

Chilean EFL teachers`perceptions of their working condition in the private, semi -private and public school systems

Tesis (Profesor de Inglés para la Enseñanza Básica y Media y al grado académico de Licenciado en Educación)This study followed a quantitative survey research design. The main purpose of the research was to explore Chilean English teachers’ perceptions of their working conditions, and compare the perceptions of teachers from the public, semi-private and private school systems. The data was collected by applying a questionnaire, a technique used in quantitative research. Sixty three teachers from forty six schools of the three educational sectors polled, answered the questionnaire using a 5-point Likert scale in order to express their perceptions regarding their working conditions. In the analysis process, the information collected was presented descriptively. In general, the participants showed positive perceptions concerning school environment and school support from their school authorities, but negative perceptions regarding salary, workload, time for non-instructional activities and society perceptions toward their profession.El presente estudio utilizó el diseño de encuesta cuantitativa. El propósito principal de nuestra investigación fue explorar las percepciones de los profesores de inglés chilenos acerca de sus condiciones laborales, y comparar estas percepciones de los profesores del sistema público, subvencionado y privado de la educación. La información fue recopilada a través de la aplicación de un cuestionario; técnica usada en el método cuantitativo de investigación. Sesenta y tres profesores de cuarenta y seis colegios de los tres sectores educacionales: público, subvencionado y privado, contestaron la encuesta usando la escala Likert del 1 al 5, de manera de obtener sus percepciones acerca de sus condiciones laborales. En el proceso de análisis, la información recolectada fue presentada descriptivamente. De manera general, los participantes demostraron percepciones positivas de acuerdo al clima laboral y el apoyo de las autoridades de los colegios; sin embargo, las percepciones fueron negativas acerca de su salario, carga laboral, tiempo para actividades extra curriculares y las percepciones de la sociedad acerca de la profesión docente

Aerospace Medicine and Biology: A continuing bibliography with indexes (supplement 314)

This bibliography lists 139 reports, articles, and other documents introduced into the NASA scientific and technical information system in August, 1988

Individual Differences in the Experience of Cognitive Workload

This study investigated the roles of four psychosocial variables – anxiety, conscientiousness, emotional intelligence, and Protestant work ethic – on subjective ratings of cognitive workload as measured by the Task Load Index (TLX) and the further connections between the four variables and TLX ratings of task performance. The four variables represented aspects of an underlying construct of elasticity versus rigidity in response to workload. Participants were 141 undergraduates who performed a vigilance task under different speeded conditions while working on a jigsaw puzzle for 90 minutes. Regression analysis showed that anxiety and emotional intelligence were the two variables most proximally related to TLX ratings. TLX ratings contributed to the prediction of performance on the puzzle, but not the vigilance task. Severity error bias was evident in some of the ratings. Although working in pairs improved performance, it also resulted in higher ratings of temporal demand and perceived performance pressure

From piles to tiles: designing for overview and control in case handling systems

Poor overview and control of workload in electronic case handling systems is a potential health risk factor which affects the users. Case handling systems must therefore be designed to give the users a better overview and maximum control over their workload. In an earlier study, we developed a prototype interface for managing cases, based on the piles metaphor. This paper introduces a second prototype, which is designed to incorporate the findings of an evaluation of the piles metaphor prototype. In this second prototype cases are visualized as “tiles”, reflecting the number and complexity of the cases. This paper also describes some the results of the evaluation of the tiles prototype

Aerospace medicine and biology: A continuing bibliography with indexes (supplement 324)

This bibliography lists 200 reports, articles and other documents introduced into the NASA Scientific and Technical Information System during May, 1989. Subject coverage includes: aerospace medicine and psychology, life support systems and controlled environments, safety equipment, exobiology and extraterrestrial life, and flight crew behavior and performance

Going to work ill: a meta-analysis of the correlates of presenteeism and a dual-path model

Interest in presenteeism, attending work while ill, has flourished in light of its consequences for individual well-being and organizational productivity. Our goal was to identify its most significant causes and correlates by quantitatively summarizing the extant research. Additionally, we built an empirical model of some key correlates and compared the etiology of presenteeism versus absenteeism. We used meta-analysis (in total, K = 109 samples, N = 175,965) to investigate the correlates of presenteeism and meta-analytic structural equation modeling to test the empirical model. Salient correlates of working while ill included general ill health, constraints on absenteeism (e.g., strict absence policies, job insecurity), elevated job demands and felt stress, lack of job and personal resources (e.g., low support and low optimism), negative relational experiences (e.g., perceived discrimination), and positive attitudes (satisfaction, engagement, and commitment). Moreover, our dual process model clarified how job demands and job and personal resources elicit presenteeism via both health impairment and motivational paths, and they explained more variation in presenteeism than absenteeism. The study sheds light on the controversial act of presenteeism, uncovering both positive and negative underlying mechanisms. The greater variance explained in presenteeism as opposed to absenteeism underlines the opportunities for researchers to meaningfully investigate the behavior and for organizations to manage it