A First- and Second-Order Motion Energy Analysis of Peripheral Motion Illusions Leads to Further Evidence of “Feature Blur” in Peripheral Vision

Anatomical and physiological differences between the central and peripheral visual systems are well documented. Recent findings have suggested that vision in the periphery is not just a scaled version of foveal vision, but rather is relatively poor at representing spatial and temporal phase and other visual features. Shapiro, Lu, Huang, Knight, and Ennis (2010) have recently examined a motion stimulus (the “curveball illusion”) in which the shift from foveal to peripheral viewing results in a dramatic spatial/temporal discontinuity. Here, we apply a similar analysis to a range of other spatial/temporal configurations that create perceptual conflict between foveal and peripheral vision.To elucidate how the differences between foveal and peripheral vision affect super-threshold vision, we created a series of complex visual displays that contain opposing sources of motion information. The displays (referred to as the peripheral escalator illusion, peripheral acceleration and deceleration illusions, rotating reversals illusion, and disappearing squares illusion) create dramatically different perceptions when viewed foveally versus peripherally. We compute the first-order and second-order directional motion energy available in the displays using a three-dimensional Fourier analysis in the (x, y, t) space. The peripheral escalator, acceleration and deceleration illusions and rotating reversals illusion all show a similar trend: in the fovea, the first-order motion energy and second-order motion energy can be perceptually separated from each other; in the periphery, the perception seems to correspond to a combination of the multiple sources of motion information. The disappearing squares illusion shows that the ability to assemble the features of Kanisza squares becomes slower in the periphery.The results lead us to hypothesize “feature blur” in the periphery (i.e., the peripheral visual system combines features that the foveal visual system can separate). Feature blur is of general importance because humans are frequently bringing the information in the periphery to the fovea and vice versa

Three Models of Global Climate Governance: From Kyoto to Paris and Beyond

The Paris Agreement has emerged as one of the world's most important international treaties. Many believe that it offers a new approach to the problem of climate change, can contribute significantly to the goal of reducing emissions, and may hold lessons for how to govern other cross‐border issues. As a result, it has been the focus of considerable debate among scholars and policy makers. But how precisely does Paris seek to govern global warming and is it likely to work in practice? We address this question by contrasting the Paris ‘model’ of climate governance with earlier ones associated with the Kyoto Protocol and Copenhagen Accord. These models have taken different approaches to the problem of governing climate change, each with attendant advantages and limitations. The Paris model advances upon earlier efforts in certain respects, but also blends elements from earlier models. We then lay out the central axes of the debate that has emerged about the future of the Paris model, and discuss research illuminating how it may operate in practice. The agreement's success will depend on how the agreement is implemented, and on how the UNFCCC process interacts with the complementary approaches to climate governance appearing beyond it

The 2°c target - a European norm enters the international stage: following the process to adoption in China

“The 2 °C target—a European norm enters the international stage” is an empirical, qualitative study, using the case of China to illustrate the role played by the EU as a leader and forerunner pushing for a 2 °C target using diffusion mechanisms of persuasion and socialization. In order to better understand and evaluate how international and European climate norms enter the global and domestic discourse, the article details the nascent theoretical debate and critically assesses the role of the scientific community as translating medium. In the field of climate change China has been an increasingly important member of the UNFCCC process and a key target of European engagement policies. Process tracing shows that British scientific and political personalities took central roles introducing the discourse about the 2 °C target in China. The article aims to set an example of possible trajectories a norm can follow and will require further testing in the future