The Fundamental Theorem of World Theory

The fundamental principle of the theory of possible worlds is that a proposition p is possible if and only if there is a possible world at which p is true. In this paper we present a valid derivation of this principle from a more general theory in which possible worlds are defined rather than taken as primitive. The general theory uses a primitive modality and axiomatizes abstract objects, properties, and propositions. We then show that this general theory has very small models and hence that its ontological commitments—and, therefore, those of the fundamental principle of world theory—are minimal.     

An efficient computerized testing method for the capuchin monkey (<Emphasis Type="Italic">Cebus apella</Emphasis>): Adaptation of the LRC-CTS to a socially housed nonhuman primate species

Even with advances in automated testing techniques, the capuchin monkey (Cebus apella) can be a difficult species to test in the laboratory, given its social/behavioral tendencies and typical activity pattern. Laboratories that maintain social colonies of capuchin monkeys are able to separate and test individuals, but the process can be very effortful and time consuming, and the resulting data can be modest in quantity. The present article describes procedures and apparatuses that were used to train a colony of computer-naive capuchin monkeys to quickly and reliably isolate themselves from group members and interact with a computerized test system in order to produce a large volume of data. Several elements that were important in motivating the monkeys to participate are discussed.     

A community psychology of object meanings: Identity negotiation during disaster recovery

What do material goods intended for personal consumption mean to community? We use the extreme example of natural disaster recovery in a community to explore this question. Our work describes how members make sense of material objects that transition from private to public possessions (damaged goods) and public to private possessions (donated goods). By blending consumer and community psychology perspectives with our narratives, we employ a three-dimensional framework for analyzing object meanings: (1) material objects as agents of communitas (a shared sense of “we”), (2) material objects as agents of individualism (a focus on “me”), and (3) material objects as agents of opposition (the “we” that speaks for “me” and “us” versus “them”). This theoretical frame allows us to show how different conceptions of identity lead to conflicting meanings of objects within community, and to explain how and why object meanings shift as objects move across time and space from private to public and from scarcity to abundance. We also provide implications for coping with disasters that consider collective and individual identities as well as oppositional stances in between.     

Average group behavior does not represent individual behavior in classical conditioning of the honeybee

Conditioned behavior as observed during classical conditioning in a group of identically treated animals provides insights into the physiological process of learning and memory formation. However, several studies in vertebrates found a remarkable difference between the group-average behavioral performance and the behavioral characteristics of individual animals. Here, we analyzed a large number of data (1640 animals) on olfactory conditioning in the honeybee (Apis mellifera). The data acquired during absolute and differential classical conditioning differed with respect to the number of conditioning trials, the conditioned odors, the intertrial intervals, and the time of retention tests. We further investigated data in which animals were tested for spontaneous recovery from extinction. In all data sets we found that the gradually increasing group-average learning curve did not adequately represent the behavior of individual animals. Individual behavior was characterized by a rapid and stable acquisition of the conditioned response (CR), as well as by a rapid and stable cessation of the CR following unrewarded stimuli. In addition, we present and evaluate different model hypotheses on how honeybees form associations during classical conditioning by implementing a gradual learning process on the one hand and an all-or-none learning process on the other hand. In summary, our findings advise that individual behavior should be recognized as a meaningful predictor for the internal state of a honeybee--irrespective of the group-average behavioral performance.     

Spatial memory and monitoring of hidden items through spatial displacements by chimpanzees (Pan troglodytes)

This study examined chimpanzee (Pan troglodytes) short-term memory for food location in near space. In Experiments 1 and 2, either 1 or 2 items (chocolate pieces) were hidden in an array of 3 or 5 containers that either remained stationary or were rotated 180 degrees or 360 degrees. When the array remained stationary, the chimpanzees remembered both item locations. When arrays were rotated, however, chimpanzees found only 1 item. In Experiment 3, 2 items were hidden in an array of 7 cups. Both items were found at levels significantly better than chance. Ninety percent of errors were made after the 1st item was found, and errors reflected memory failure rather than a failure of inhibitory control.     

Thought processes,Loneliness and Anxiety. Experimental and psychoanalytical investigations into creative thinking

The author questions whether Kernberg's suggestion that the interaction between splitting and other defence mechanisms—such as primitive idealization, omnipotence, devaluation and denial [disavowal]—gives an adequate psychodynamic explanation of borderline personality structures. The author shows that the assumption of a splitting mechanism provokes contradictions and that primitive idealization, omnipotence, devaluation and disavowal cannot be seen as genuine defence mechanisms. He argues that primitive idealization is a type of reaction formation and that the omnipotence of these patients can be put down to identification with the idealized ego-functions of their objects. He also maintains that the clinical phenomena can be understood as the outcome of a combination of an “equiparant” and “disequiparant” isolation, displacement, projection and primitive idealization, making the concept of splitting as an explanatory device superfluous.     

Knowledge representation,the World Wide Web,and the evolution of logic

It is almost universally acknowledged that first-order logic (FOL), with its clean, well-understood syntax and semantics, allows for the clear expression of philosophical arguments and ideas. Indeed, an argument or philosophical theory rendered in FOL is perhaps the cleanest example there is of “representing philosophy”. A number of prominent syntactic and semantic properties of FOL reflect metaphysical presuppositions that stem from its Fregean origins, particularly the idea of an inviolable divide between concept and object. These presuppositions, taken at face value, reflect a significant metaphysical viewpoint, one that can in fact hinder or prejudice the representation of philosophical ideas and arguments. Philosophers have of course noticed this and have, accordingly, sought to alter or extend traditional FOL in novel ways to reflect a more flexible and egalitarian metaphysical standpoint. The purpose of this paper, however, is to document and discuss how similar “adaptations” to FOL—culminating in a standardized framework known as Common Logic—have evolved out of the more practical and applied encounter of FOL with the problem of representing, sharing, and reasoning upon information on World Wide Web.     

Enquiring into the qualitative nature of anger: Challenges and strengths of the introspective method

Current Psychology - Anger is known to be a negatively valenced emotion that can trigger different forms of harmful actions. Traditionally, it is studied from a third-person point of view using...