Increasing conspicuity on night-time roads: Perspectives from cyclists and runners

Pedestrians and cyclists are at significant risk of being killed as a result of a collision with a vehicle at night-time because of their poor conspicuity. Retroreflective strips positioned on the moveable joints, in a biological motion configuration (biomotion), greatly enhance the night-time conspicuity of pedestrians and cyclists, but it is not clear how widely this strategy is adopted among those running and cycling under low light levels (dawn and dusk or at night). This study explored runners’ and cyclists’ beliefs about their own conspicuity, and the strategies they use to increase their conspicuity and safety under low light levels.Nine focus groups involving 50 participants (mean age = 39.5 ± 13.9 years) were held with individuals who ran and/or cycled under low light conditions or at night-time. The strategies that participants used to increase their conspicuity and enhance their personal safety, and the importance they placed on increased conspicuity to other road users at night was explored. Data were analysed thematically, with two main themes identified. Strategies describes the different approaches used to increase conspicuity when running or cycling in low light, some of which are ineffective. Importance describes how conspicuity relates to other considerations that influence cyclists and runners. While they may believe that conspicuity is essential for their safety, they may compromise their own conspicuity by prioritising style or comfort, or because they believe that being more conspicuous is of limited value because it cannot compensate for the behaviour of other road users.In summary, cyclists and runners are largely unaware of effective strategies to increase their night-time conspicuity, particularly the use of biomotion reflective strips. Garment manufacturers should ensure that conspicuity features (with supporting educative product information on labels) are incorporated into cyclists’ and runners’ clothing or accessories to improve wearer conspicuity and hence safety in low light conditions.     

策略发现的元认知机制和联结机制的交互作用理论

本文主要介绍了策略发现的元认知机制和联结机制的三种交互作用理论,包括两种表征翻译理论和新近发展的竞争性谈判理论,并对这三种理论进行了评价。     

行为可见增加利他偏好及其社会规范机制

在不同社会偏好类型中,研究者较为关注利他偏好及其信号功能。本研究探究在独裁者游戏中,决策者的利他偏好如何受到分配方案对接受者可见性的影响。实验1采用行为实验结合计算建模的方法,发现无论在选择或评分条件下,相比于行为不可见,当分配者的行为能够为接受者所见时,分配者都表现出更大程度的利他偏好。此外,相比于评分条件,在选择时人们更加在意分配效率。实验2仅使用选择条件,并操纵社会规范,发现行为可见增加利他偏好的作用依赖于利他的社会规范,当存在非利他社会规范时,行为可见的影响减小。本研究结果表明,在利他社会规范下,当行为对接受者可见时,人们将表现出更多利他偏好。     

Invisible Stimuli,Implicit Thresholds: Why Invisibility Judgments Cannot be Interpreted in Isolation

Some studies of unconscious cognition rely on judgments of participants stating that they have “not seen” the critical stimulus (e.g., in a masked-priming experiment). Trials in which participants gave invisibility judgments are then treated as those where the critical stimulus was “subliminal” or “unconscious,” as opposed to trials with higher visibility ratings. Sometimes, only these trials are further analyzed, for instance, for unconscious priming effects. Here I argue that this practice requires implicit assumptions about subjective measures of awareness incompatible with basic models of categorization under uncertainty (e.g., modern signal-detection and threshold theories). Most importantly, it ignores the potential effects of response bias. Instead of taking invisibility judgments literally, they would better be employed in parametric experiments where stimulus visibility is manipulated systematically, not accidentally. This would allow studying qualitative and double dissociations between measures of awareness and of stimulus processing per se.     

Illusions of integration are subjectively impenetrable: Phenomenological experience of Lag 1 percepts during dual-target RSVP

We investigated the relationship between different kinds of target reports in a rapid serial visual presentation task, and their associated perceptual experience. Participants reported the identity of two targets embedded in a stream of stimuli and their associated subjective visibility. In our task, target stimuli could be combined together to form more complex ones, thus allowing participants to report temporally integrated percepts. We found that integrated percepts were associated with high subjective visibility scores, whereas reports in which the order of targets was reversed led to a poorer perceptual experience. We also found a reciprocal relationship between the chance of the second target not being reported correctly and the perceptual experience associated with the first one. Principally, our results indicate that integrated percepts are experienced as a unique, clear perceptual event, whereas order reversals are experienced as confused, similar to cases in which an entirely wrong response was given.     

Effect of motorcycle lighting configurations on drivers’ perceptions of closing during nighttime driving

ObjectiveThe aims were to better understand how drivers perceive an approaching set of motorcycle headlights during nighttime driving and to determine whether alternative motorcycle headlight configurations improve drivers’ perceptual judgments of closing for an oncoming motorcycle.BackgroundMotorcyclists account for a disproportionate number of roadway fatalities, especially at night. One potential cause of this is drivers’ misjudgments of a motorcycle’s approach.MethodThe first experiment examined whether drivers were more sensitive to horizontal or vertical optical expansion and whether drivers could integrate these two dimensions to achieve a lower looming threshold. A second experiment built on these results to test whether alternative headlight configurations that maximized size were better than other motorcycle headlight configurations and a car’s headlights. In both experiments, participants were instructed to press a button to indicate when they first perceived an oncoming vehicle to be closing under nighttime driving conditions.ResultsHeadlight orientation did not affect when drivers perceived closing, and drivers were not able to integrate optical expansion from multiple dimensions in a way that achieves a lower looming threshold. However, the alternative motorcycle headlight configurations that accentuated the full extent of a motorcycle’s size resulted in drivers perceiving closing sooner than other motorcycle headlight configurations but not sooner than a car.ConclusionDrivers perceive closing sooner for larger headlight configurations except when the headlight configurations are relatively small, in which case the effect of headlight size is attenuated.ApplicationDrivers’ perceptual judgments of motorcycles may improve when motorcycles have headlights that span its full height.     

Present but invisible: Physical obscurity fosters social disconnection

Research suggests that we feel invisible and disconnected when others avoid our gaze. In three studies, we examine whether similar feelings may arise when others are unable to meet our gaze—when they are unaware of our presence altogether. We posit that feelings of loneliness and disconnection can arise when others are unable to sense one's physical presence. To test whether invisibility engenders loneliness, we primed participants with the invisibility construct (Studies 1 and 2) and manipulated actual visibility (Study 3) prior to assessing feelings of loneliness and isolation. Results revealed that being present, but unseen, is sufficient to induce loneliness. Findings are related to the ostracism and intersectional invisibility literatures, and the social costs of physical obscurity are discussed.     

Social mirrors. Tove Jansson’s Invisible Child and the importance of being seen

This article examines the experience of being seen and analyzes its central role in the formation of a coherent sense of self. Tove Jansson’s short story from 1962, ‘The Invisible Child’, serves as the red thread of the article, and the story is analyzed in the light of Donald Winnicott’s work on social mirroring. The analysis is enriched by the psychoanalytic insights of Veikko Tähkä and Heinz Kohut, and complemented by Axel Honneth’s philosophical elaborations as well as by recent developmental findings as presented by Vasudevi Reddy. The article is divided into an introduction and three sections. After summarizing Jansson’s story in the introduction, the first section elaborates and examines different senses of social invisibility. The second section assesses developmental factors that promote social invisibility and highlights the importance of being seen. The third and final section interprets Jansson’s story as an analogy to an intensive therapeutic process, while pinpointing those elements that facilitate the restructuring of a disturbed sense of self. As a whole, the article thus discusses an issue that is often simply taken for granted in discussions of empathy and interpersonal experience: social visibility.     

The level of subjective visibility at different stages of memory processing

Recent research suggests that the content of iconic memory (IM) and fragile visual short-term memory could be associated with a similar level of conscious accessibility as working memory (WM). The results of our studies, in which we used a subjective visibility scale in a partial-report change detection paradigm, indicate that it is possible to distinguish separate stages of memory based on both discriminative accuracy and conscious accessibility. The highest scores were associated with IM and the lowest with WM, while somewhere in the middle there was fragile memory. Based on classical assumptions, WM accessibility should be greater than the other two types of memory; however, our study showed that this might not always be the case. We discuss the potential sources of this outcome, of which one may be the task construction, as we only tested items that were directly in the focus of attention.     

Masked cross-modal priming turns on a glimpse of the prime

We examined if cross-modal priming (print to speech) was greater for participants who were aware of the presence of letters in the experiment. Experiment 1 determined that word primes displayed at 47 ms were adequately masked. In Experiment 2 (a, b) with primes displayed at 47 ms masked priming occurred for within-mode printed targets but not for spoken ones. Experiment 3, with spoken targets, presented primes at two different durations (59, 71 ms) and priming was found for participants who reported seeing letters but not for those who did not. The results are discussed in terms how the link between prime and target representations might be strengthened even by cursory awareness of the prime and what this tells us about priming.