A dialogical exploration of the grey zone of health and illness: medical science,anthropology, and Plato on alcohol consumption

This paper takes a phenomenological hermeneutic orientation to explicate and explore the notion of the grey zone of health and illness and seeks to develop the concept through an examination of the case of alcohol consumption. The grey zone is an interpretive area referring to the irremediable zone of ambiguity that haunts even the most apparently resolute discourse. This idea points to an ontological indeterminacy, in the face of which decisions have to be made with regard to the health of a person (e.g., an alcoholic), a system (e.g., the health system), or a society. The fundamental character of this notion will be developed in relation to the discourse on health and the limitations of different disciplinary practices. The case of alcohol consumption will be used to tease out the grey zone embedded in the different kinds of knowledge made available through the disciplinary traditions of medical science, with its emphasis on somatic well-being, and anthropology, with its focus on communal well-being. This tension or grey zone embedded in different knowledge outcomes will be shown to have a discursive parallel with the dialogue between the Athenian, the Spartan, and the Cretan in Plato’s Laws. Making use of the dialogical approach as described by Gadamer, the Athenian’s particular resolution of the tension will be explored as a case study to demonstrate the necessarily particular analysis involved in a grey zone resolution.

“涟漪效应”与“心理台风眼效应”：不同程度COVID-19疫情地区民众风险认知与焦虑的双视角检验

在因防控COVID-19疫情武汉“封城”后的一个半月内, 对全国34个省(区市)4833名民众的风险认知与焦虑进行了当事人视角和旁观者视角的调查研究。结果表明, (1)基于当事人视角时, 不同程度疫情地区民众的风险认知和焦虑存在类似“涟漪效应”的趋势, 疫情严重地区大于其他地区; (2)基于旁观者视角, 民众对武汉居民的焦虑和对所需心理咨询工作者和医生数量的评估存在“心理台风眼效应”; (3)基于旁观者视角, 在风险认知上, 低风险地区民众对武汉居民的评估显著低于高、中高及中风险地区的评估, 部分支持“涟漪效应”; 研究还发现了“边缘带效应”和“心理可控阈限”的存在。本研究一方面为“心理台风眼效应”研究的“当事人与旁观者”视角知觉差异提供了更为丰富的直接证据, 另一方面为突发公共卫生事件应急管理提供了有针对性的心理依据。     

维果茨基"最近发展区"理论对我国教学改革的启示

该文探讨了维果茨基的“最近发展区”理论及其涵义,并揭示了这一理论对我国教学改革的启示。     

Hide-and-seek around the centre of interest: The dead zone of attention revealed by change blindness

Three experiments examined spatial allocation of attention during active search for visual changes. In all experiments, there were three conditions of change location related to a centre of interest: (1) Central (most attended location itself), (2) near, and (3) far marginal change. In Experiment 1, participants showed the slowest search and the largest number of undetected changes in near condition. Moreover, they misidentified near changes more frequently than central and far ones. In Experiment 2, participants had to search for marginal changes in the presence of a once noticed central change that summoned additional attention to a central location. It resulted in further search slowing for near changes. In Experiment 3, participants searched for one of two concurrent marginal changes in the presence of a central one. They detected far changes about 2.3 times more frequently than near ones. Taken together, these results support the notion of “dead zone of attention” surrounding attentional focus. Several speculations about the nature of dead zone are discussed.     

An evaluation of the effectiveness of countermeasures for improving the safety of dilemma zones: A driving simulator study

The main objective of this driving simulator study is to analyze the behavior of the driver at the start of the yellow signal of a signalized rural intersection and identify the most effective countermeasures for tackling the dilemma zone, namely an area on the intersection approach where vehicles at the start of the yellow phase can neither safely stop before the stop line nor cross the intersection. The following countermeasures were tested in the study on a sample of 48 drivers: green signal countdown timers, GSCT (C₁); a new pattern of vertical and horizontal warning signs (C₂); and an advanced on-board driver assistance system based on augmented reality (AR) and connected vehicle technologies (C₃). These countermeasures were tested and compared to a baseline condition (B) where no countermeasures were applied. Based on the results of this study, the C₂ and C₃ countermeasures have proven to be valid tools for reducing driver indecision when approaching signalized intersections at the start of the yellow signal. In fact, using C₂ and C₃, the length of the dilemma zone was equal to 30 m and 36 m, respectively, with a reduction of about 50%, as compared to the baseline condition (B). Moreover, a reduced number of false behaviors was recorded, as well as a greater consistency in driver decision-making behaviors. Conversely, the C₁ countermeasure did not lead to a significant improvement in the dilemma zone: an unnecessary increase in early stop rates was recorded, resulting in reduced intersection efficiency and operations.     

Analysing driver’s decision in dilemma zone at signalized intersections under disordered traffic conditions

Delay in the decision-making process of stop or go during the amber phase of the signal cycle often leads to abrupt hard deceleration or red light violations at signalized intersections. The indecisiveness or the dilemma in decision making often results in compromised safety of the road users. The present study attempts to analyze the driver’s behaviour in order to make the decision of stop or go and developed a binary logistic regression model while considering different traffic behaviour parameters exhibited and observed after the onset of the amber phase. Empirical vehicular trajectory data from three signalized intersections covering 121 signal cycles and 1347 vehicles are used in the study. The study presents two dilemma zone identification models based on distance from the stop line, focusing on easy-to-use and static driver assistance and dynamic-realtime driver assistance systems. Both the models are observed to show good fit and prediction accuracy. The models are validated internally and externally for their adaptability in the field. The effect of different traffic parameters on the dilemma zone is explored, and a possible real-time application of the dynamic model as a driver assistance system in decision-making is explored.     

A comparison of self-nominated and actual speeds in work zones

Despite significant research on drivers’ speeding behavior in work zones, little is known about how well drivers’ judgments of appropriate speeds match their actual speeds and what factors influence their judgments. This study aims to fill these two important gaps in the literature by comparing observed speeds in two work zones with drivers’ self-nominated speeds for the same work zones. In an online survey, drivers nominated speeds for the two work zones based on photographs in which the actual posted speed limits were not revealed. A simultaneous equation modeling approach was employed to examine the effects of driver characteristics on their self-nominated speeds. The results showed that survey participants nominated lower speeds (corresponding to higher compliance rates) than those which were observed. Higher speeds were nominated by males than females, young and middle aged drivers than older drivers, and drivers with truck driving experience than those who drive only cars. Larger differences between nominated and observed speeds were found among car drivers than truck drivers. These differences suggest that self-nominated speeds might not be valid indicators of the observed work zone speeds and therefore should not be used as an alternative to observed speed data.     

A New Border Zone in Science. Collaboration and Tensions between Modelling Ecologists and Field Naturalists

Modelling ecologists have entered ecology labs. They need large quantities of data to improve their models and are eager to collaborate with field naturalists. This modifies existing relationships between these two groups of natural scientists who have different ways of knowing. We observed how a new border zone was being opened up between modelling ecologists and field naturalists working in a National Botanical Conservatory in France. After an arduous start, due to the initial reluctance of the field naturalists, the modelling ecologists and the field naturalists performed several activities together: they transformed existing data, produced new data, interpreted all these data, articulated research questions and hypotheses. They also created a hybrid database, mixing data from different sources, and they co-authored papers. This clearly changed the professional status of the field naturalists, who felt they were finally treated as genuine research partners. Yet, the modelling ecologists and the field naturalists remained as two distinct groups, with their specific practices, aims, skills and identities. Although collaboration was considered a clear success from both sides, there were some lingering tensions. The field naturalists were still somewhat wary of being downgraded to the status of mere data providers. They were therefore determined to see to it that their work and way of knowing would receive due recognition in the long run.     

The effect of in-vehicle warning systems on speed compliance in work zones

The purpose of this research was to evaluate the effectiveness of augmented in-vehicle speed warnings on driver behavior in work zones. The influence of three device configurations were examined as the drivers entered a work zone which was presented in a simulated driving environment. The first configuration was a control condition which used only traditional signage. The second condition had the addition of a visual in-vehicle warning while the final condition had the addition of an auditory in-vehicle warning. Results indicated that adding in-vehicle warnings did affect driver compliance to the work zone speed limit. Participants in the audio warning condition responded more quickly to the warning than those in the visual condition. Both augmented warning configurations differed significantly and were each respectively different from the drivers in the control condition. Based on these results we suggest a combination of in-vehicle warnings. Upon entry of the work zone we suggest a combined audio and visual warning message. However, after the initial entry phase, a visual warning message shows greater promise for the on-going modulation of driver speed transit.