Appearance and reality

There is tension between the appealing idea that visual experience puts us in touch with objective reality and the doctrine of perceptual relativity, the claim that experience varies with such factors as distance, lighting, and angle of view. In this paper I present arguments for relativity, and then go on to propose that in view of relativity, we should believe that the properties presented to us in perception are relational and viewpoint‐dependent. I conclude by sketching a theory of how we nonetheless manage to achieve contact with objective properties. According to the theory, such contact is best explained in terms of perceptual representations acting in concert with cognitive and motoric representations, not in terms of perceptual representations alone.     

The formation of linked perceptual classes

Multiple-exemplar training with stimuli in four domains induced two new fill-based (A1' and A2') and satellite-image-based (B1' and B2') perceptual classes. Conditional discriminations were established between the endpoints of the A1' and B1' classes as well as the A2' and B2' classes. The emergence of linked perceptual classes was evaluated by the performances occasioned by nine cross-class probes that contained fill variants as samples and satellite variants as comparisons, along with nine other cross-class probes that consisted of satellite variants as samples and fill variants as comparisons. The 18 probes were first presented serially and then concurrently. Class-consistent responding indicated the emergence of linked perceptual classes. Of the linked perceptual classes, 70% emerged during the initial serial test. An additional 20% of the linked perceptual classes emerged during the subsequently presented concurrent test block. Thus, linked perceptual classes emerged on an immediate or delayed basis. Linked perceptual classes, then, share structural and fuctional similarities with equivalence classes, generalized equivalence classes, cross-modal classes, and complex maturally occurring categories, and may clarify processes such as intersensory perception.     

Meaningful processing of meaningless stimuli: the influence of perceptual experience on early visual processing of faces

The N170 is an event-related potential component associated with extrastriate visual mechanisms involved in detecting human faces and leading to their characteristic structural encoding. Consequently the N170 discriminates the processing of stimuli providing physiognomic information from the processing of other, similarly complex, visual patterns. We have used this effect to explore the top-down influence of newly acquired experience on the initial visual categorization of physiognomic stimuli. Schematic faces having the inner components mislocated did not elicit an N170 effect in naive participants. However, after normally configured versions of the schematic faces were exposed, suggesting what the ambiguous patterns represented, the same patterns elicited an N170 effect as conspicuous as that elicited by regular schematic faces. This priming effect, which changed the visual processing of distorted faces in extrastriate regions, could not be explained by post-perceptual decisions. Although accounts based on changes in focal attention, or within-vision constraints could not be categorically rejected, this outcome might suggest cognitive penetrability of early visual categorization.     

What We Owe to the Global Poor

This essay defends an account of the duties to the global poor that is informed by the empirical question of what makes countries rich or poor, and that tends to be broadly in agreement with John Rawlss account in The Law of Peoples. I begin by introducing the debate about the sources of growth and explore its implications for duties towards the poor. Next I explore whether (and deny that) there are any further-reaching duties towards the poor. Finally, I ask about the moral foundations for the duties to the poor of the sort that earlier parts argue there are.     

Do Patriotic Ties Limit Global Justice Duties?

Some theorists who accept the existence of global justice duties to alleviate the condition of distant needy strangers hold that these duties are significantly constrained by special ties to fellow countrymen. The patriotic priority thesis holds that morality requires the members of each nation-state to give priority to helping needy fellow compatriots over more needy distant strangers. Three arguments for constraint and patriotic priority are examined in this essay: an argument from fair play, one from coercion, another from coercion and autonomy. Under scrutiny, none of these arguments qualifies as successful.     

陈霖的拓扑性质知觉理论

2005年第四期“Visual Cognition”期刊专题讨论了拓扑知觉理沧,包括陈霖的主题文章、对这篇文章的评论以及陈霖对这些评论的答复。本文从三个方面介绍了陈霖的拓扑性质知觉理沦：拓扑性质的早期知觉、知觉物体的定义以及拓扑性质知觉理论的意义。     

Global Inequality and International Institutions

This article considers the links between international institutions and global economic justice: how international institutions might be morally important; how they have changed; and at what those changes imply for justice. The institutional structure of international society has evolved in ways that help to undercut the arguments of those who take a restrictionist position towards global economic justice. There is now a denser and more integrated network of shared institutions and practices within which social expectations of global justice and injustice have become more securely established. But, at the same time, our major international social institutions continue to constitute a deformed political order. This combination of density and deformity shapes how we should think about international justice in general and has important implications for the scope, character, and modalities of global economic justice. Having laid out a view of normative development and where it leads, the article then examines why international distributive justice remains so marginal to current practice.     

Heat and Violence

The heat hypothesis states that hot temperatures can increase aggressive motives and behaviors. Although alternative explanations occasionally account for some portion of the observed increases in aggression when temperatures are high, none are sufficient to account for most such heat effects. Hot temperatures increase aggression by directly increasing feelings of hostility and indirectly increasing aggressive thoughts. Results show that global warming trends may well increase violent-crime rates. Better climate controls in many institutional settings (e.g., prisons, schools, the workplace) may reduce aggression-related problems in those settings.     

A global optimization approach for generating efficient points for multiobjective concave fractional programs

In this article, we present a global optimization approach for generating efficient points for multiobjective concave fractional programming problems. The main work of the approach involves solving an instance of a concave multiplicative fractional program (W̄). Problem (W̄) is a global optimization problem for which no known algorithms are available. Therefore, to render the approach practical, we develop and validate a branch and bound algorithm for globally solving problem (W̄). To illustrate the performance of the global optimization approach, we use it to generate efficient points for a sample multiobjective concave fractional program. Copyright © 2006 John Wiley & Sons, Ltd.