Landmark Discrimination Learning in the Dog

Allocentric spatial memory was studied in dogs of varying ages and sources using a landmark discrimination task. The primary goal of this study was to develop a protocol to test landmark discrimination learning in the dog. Using a modified version of a landmark test developed for use in monkeys, we successfully trained dogs to make a spatial discrimination on the basis of the position of a visual landmark relative to two identical discriminanda. Task performance decreased, however, as the distance between the landmark and the “discriminandum” was increased. A subgroup of these dogs was also tested on a delayed nonmatching to position spatial memory task (DNMP), which relies on egocentric spatial cues. These findings suggest that dogs can acquire both allocentric and egocentric spatial tasks. These data provide a useful tool for evaluating the ability of canines to use allocentric cues in spatial learning.     

The determination of theory by evidence: The case for quantum discontinuity, 1900–1915

The thesis that observation necessarily fails to determine theory is false in the sense that observation can provide overwhelming evidence for a particular theory or even a hypothesis within the theory. The saga of quantum discontinuity illustrates the power of evidence to determine theory and shows how that power can be underestimated by inadequate caricatures of the evidential case. That quantum discontinuity can save the phenomena of black body radiation is the widely known result, but it leaves open the possibilities of other accounts. That these phenomena, with the aid of minimal assumptions, entail quantum discontinuity is the crucial but now largely forgotten result. It was first demonstrated by Ehrenfest and Poincaré in 1911 and 1912.     

Primacy of Affect Over Cognition in Determining Adult Men's Condom–Use Behavior: A Review1

Prior research suggests that failure to use condoms can be understood within the context of condom‐related attitudes. We reviewed quantitative and qualitative literature on adult men's condom‐use attitudes; condom‐related attitudinal beliefs were classified as cognitive (e.g., effectiveness) or affective (e.g., pleasure‐related), and their relationships to behavior were examined. To determine differences in the effects of cognitive and affective beliefs, we conducted a critical qualitative review, a meta‐analysis, and a “vote‐count.” In support of the primacy of affect hypothesis (Zajonc, 1984), cognitive beliefs were weaker predictors of condom use than were affective beliefs. Results suggest that HIV‐prevention interventions will have greater success by addressing negative affective reactions to condom use in addition to promoting the protective value of condoms.     

From student to superhero: Situational primes shape future helping

The present research uses priming techniques to modify commitment to and engagement in future helping behavior. Relative to a control condition, people primed with the exemplar Superman saw themselves as less likely (Studies 1a and 1b), and participants primed with the category superhero saw themselves as more likely (Study 1a), to help in hypothetical situations. Study 2 extended these effects to real-world planned helping behavior, by demonstrating that these primes impacted commitment to future volunteerism. Finally, Study 3 showed that these changes in initial commitment impacted volunteering behavior up to three months after initial exposure. These results demonstrate that fleeting situational primes can impact not only spontaneous behavior, but also future behavior.     

Neural mechanisms of social influence

The present investigation explores the neural mechanisms underlying the impact of social influence on preferences. We socially tagged symbols as valued or not – by exposing participants to the preferences of their peers – and assessed subsequent brain activity during an incidental processing task in which participants viewed popular, unpopular, and novel symbols. The medial prefrontal cortex (mPFC) differentiated between symbols that were and were not socially tagged – a possible index of normative influence – while aspects of the striatum (the caudate) differentiated between popular and unpopular symbols – a possible index of informational influence. These results suggest that integrating activity in these two brain regions may differentiate objects that have become valued as a result of social influence from those valued for non-social reasons.     

Beyond Positivist Ecology: Toward an Integrated Ecological Ethics

A post-positivist understanding of ecological science and the call for an “ecological ethic” indicate the need for a radically new approach to evaluating environmental change. The positivist view of science cannot capture the essence of environmental sciences because the recent work of “reflexive” ecological modelers shows that this requires a reconceptualization of the way in which values and ecological models interact in scientific process. Reflexive modelers are ecological modelers who believe it is appropriate for ecologists to examine the motives for their choices in developing models; this self-reflexive approach opens the door to a new way of integrating values into public discourse and to a more comprehensive approach to evaluating ecological change. This reflexive building of ecological models is introduced through the transformative simile of Aldo Leopold, which shows that learning to “think like a mountain” involves a shift in both ecological modeling and in values and responsibility. An adequate, interdisciplinary approach to ecological valuation, requires a re-framing of the evaluation questions in entirely new ways, i.e., a review of the current status of interdisciplinary value theory with respect to ecological values reveals that neither of the widely accepted theories of environmental value—neither economic utilitarianism nor intrinsic value theory (environmental ethics)—provides a foundation for an ecologically sensitive evaluation process. Thus, a new, ecologically sensitive, and more comprehensive approach to evaluating ecological change would include an examination of the metaphors that motivate the models used to describe environmental change.

Psychology and Experimental Economics: A Gap in Abstraction

ABSTRACT— Experimental economics and social psychology share an interest in a widening subset of topics, relying on similar lab-based methods to address similar questions about human behavior, yet dialogue between the two fields remains in its infancy. We propose a framework for understanding this disconnect: The different approaches the disciplines take to translating real-world behavior into the laboratory create a "gap in abstraction," which contributes to crucial differences in philosophy about the roles of deception and incentives in experiments and limits cross-pollination. We review two areas of common interest—altruism and group-based discrimination—which demonstrate this gap yet also reveal ways in which the two approaches might be seen as complementary rather than contradictory.     

Disbelief as the Dual of Belief

The duality of truth and falsity in a Boolean algebra of propositions is used to generate a duality of belief and disbelief. To each additive probability measure that represents belief there corresponds a dual additive measure that represents disbelief. The dual measure has its own peculiar calculus, in which, for example, measures are added when propositions are combined under conjunction. A Venn diagram of the measure has the contradiction as its total space. While additive measures are not self‐dual, the epistemic state of complete ignorance is represented by the unique, monotonic, non‐additive measure that is self‐dual in its contingent propositions. Convex sets of additive measures fail to represent complete ignorance since they are not self‐dual.