Perceptions and possibilities

Not only do black students need assistance in solving the problems that are peculiar to them, but so do the school personnel with whom they come in daily contact. Counselors must realize how influential they are in helping youth form images of themselves and attitudes about their world. These students need help in channeling their energies toward constructive ends and in developing positive outlooks about life.     

Ultimacy and alternative possibilities

I explore a key feature of Robert Kane’s libertarianism (about which I have been puzzled for some time). Kane claims that we should separate issues of alternative possibilities from issues of ultimacy, but he further argues that they are connected in a certain way. I call into question this connection, and I continue to argue for a strict separation of considerations pertaining to alternative possibilities and “actual-sequence” considerations.

Relevant possibilities

There are a number of relevant alternatives accounts of knowledge in the literature, including those by contextualists (like Lewis and Cohen), and invariantists (like Dretske). Despite widespread discussion of such views, an explication of the notion of relevance is conspicuously absent from the literature. Without a careful explication of that notion, relevant alternatives accounts resist evaluation. This paper attempts to aid in the evaluation of those accounts, by providing an account of relevance. The account rejects two common presuppositions about the notion of relevance. The account holds that worlds, rather than alternatives, are relevant, and that distant worlds can be relevant. Relevant worlds turn out to be those worlds at which an alternative to one’s belief obtains, and is such that one’s epistemic position (with respect to what one believes at the actual world) is worse than it is at the actual world.     

Generating possibilities

Our knowledge of the most basic alternative possibilities can be thought of as generated recursively from what we know about the actual world. But what are the generating principles? According to one view, they are recombinational: roughly, alternative possibilities are generated by “patching together” parts of distinct worlds or “blotting out” parts of worlds to yield new worlds. I argue that this view is inadequate. It is difficult to state in a way that is true and non-trivial, and anyway fails to account for our knowledge that there might have been other things, properties, relations, and combinations of these than there actually are. I sketch and defend an alternative view based on the distinction between determinable and determinate properties: roughly, alternative possibilities are generated by “intra-determinable” variation, variation from one determinate to another of the same determinable.     

Hypnosis and hemispheric asymmetry

Participants of low and high hypnotic susceptibility were tested on a temporal order judgement task, both with and without hypnosis. Judgements were made of the order of presentation of light flashes appearing in first one hemi-field then the other. There were differences in the inter-stimulus intervals required accurately to report the order, depending upon which hemi-field led. This asymmetry was most marked in hypnotically susceptible participants and reversed when they were hypnotised. This implies not only that brain activity changes in hypnosis, but also that there is a difference in brain function between people of low and high hypnotic susceptibility. The latter exhibited a faster-acting left hemisphere in the waking state, but faster right when hypnotised.     

Process causality and asymmetry

Process theories of causality seek to explicate causality as a property of individual causal processes. This paper examines the capacity of such theories to account for the asymmetry of causation. Three types of theories of asymmetry are discussed; the subjective, the temporal, and the physical, the third of these being the preferred approach. Asymmetric features of the world, namely the entropic and Kaon arrows, are considered as possible sources of causal asymmetry and a physical theory of asymmetry is subsequently developed with special reference to the questions of objectivity and backwards causation.An earlier draft of this paper was read at the A.A.P. conference at the University of Sydney, June, 1990. The author would like to thank Peter Menzies and Huw Price for their helpful comments.     

Aristotle's different possibilities

Marxism is often claimed to be incompatible with any kind of ethical theory, because of its assumptions of economic determinism, of the class character of morals, and of the subordination of morality to politics. But the author proposes that these assumptions can be interpreted in such a flexible way as not to rule out the freedom of choice and responsibility, die relative independence of morals from economic conditions and political ends, and concepts of universal human value and a specifically moral ideal. A humanist philosophy, centered in Marx's analysis of alienation, provides a sufficiently rich theoretical basis for the solution of both ethical and meta‐ethical’ problems.     

Omissions as possibilities

I present and develop the view that omissions are de re possibilities of actual events. Omissions do not literally fail to occur; rather, they possibly occur. An omission is a tripartite metaphysical entity composed of an actual event, a possible event, and a contextually specified counterpart relation between them. This view resolves ontological, causal, and semantic puzzles about omissions, and also accounts for important data about moral responsibility for outcomes resulting from omissions.     

Positive-negative asymmetry and bipolar contrast

Abstract

Repertory grids in which personal acquaintances were evaluated on the basis of bipolar constructs (e.g., generous-stingy) were completed by 58 undergraduates. A “person format”, with all constructs applied to each acquaintance in turn, was assigned randomly to 29 students; a “construct format”, in which these acquaintances were evaluated successively on only 1 construct at a time, was assigned to the other 29. The relative frequency of positive evaluations in the construct format grids (0.62) was consistent with the golden section hypothesis, whereas that in the person format grids (0.66) was significantly higher. Theoretical implications of these findings were discussed in terms of H. Frank's (1964) theoretical definition of strikingness and V. A. Lefebvre's (1990) computational model of reflexion.     

Lateral asymmetry and tactile sensitivity

Weinstein found in 1963 that the left female breast is more sensitive to tactile stimulation than the right breast. Saling and Cooke in 1984 hypothesized that this asymmetry in breast sensitivity underlies the well-documented leftward bias in maternal cradling behaviour, which is independent of manual specialization. Our interest in the Saling and Cooke hypothesis led to an attempt to replicate Weinstein's 1963 study. His findings were not supported. Further, a review of the literature on the lateral distribution of cutaneous thresholds showed that there is little experimental support for the widely held belief that the left side of the body is uniformly more sensitive than the right.     

Skewness and asymmetry of distributions

The ‘skewness’ of a distribution, a poorly-defined term, is conventionally deemed to be invariant under linear transformations. A comparison is made of three criteria of it: the sign of odd central moments; the several relationships of the mean, the median and the mode; and asymmetry proper which is the set of ratios of the probability densities of all pairs of points equidistant above and below some arbitrary point, usually the principal mode. Some useful general relationships are discussed. The skeness of convolutions is briefly discussed. A class of distributions is identified for which the skewness of the minimum ofk competing processes is independent ofk. It has importance in the parametric study of survivorship.     

Time travel and counterfactual asymmetry

Synthese - We standardly evaluate counterfactuals and abilities in temporally asymmetric terms—by keeping the past fixed and holding the future open. Only future events depend...     

Bilingualism and brain functional asymmetry

The task of the neural organization of the native language, acquired by a direct method and of another language, studied at school, performed correspondingly by the left and the right hemispheres, was studied in the bilingual patient after unilateral electroconvulsive therapy used in psychiatry. It was established that in such a bilingual type the right hemisphere is concerned with the formation of deep semantic structures of the native language while the left hemisphere is responsible for the formation of second language deep structures and of surface structures of both languages. The effect of language learning method on cerebral organization of bilingualism is postulated.     

Explanation: Pragmatics and asymmetry

This paper derives from an NEH Summer Seminar for College Teachers on scientific explanation directed by Paul Humphreys at the University of Virginia in the summer of 1991. I am indebted to Professor Humphreys for his comments on many drafts. A previous version was presented at the Pacific Division Meetings of the APA in March 1992. For encouragement regarding, comments on, and criticisms of prior versions, I'd also like to thank Eric Barnes, Carol Cleland, Gary Ebbs, Geoffrey Gorham, Geoffrey Hellman, Elizabeth Lloyd, Larry Shapiro, Alison Simmons, and David Stump. Special thanks to Bas van Fraassen for correspondence on these issues, and to Philip Kitcher for encouragement. I am responsible for all remaining errors.     

EEG alpha asymmetry and creativity

Results of 3 experiments examining the relationship between creativity and left-hemisphere and right-hemisphere EEG activity are reported. Creativity has been hypothesized to involve the use of primary-process cognition, and such cognition is hypothetically accompanied by activation of the right cerebral hemisphere. In light of these hypotheses, we predicted that highly-creative people should exhibit greater right-hemisphere than left-hemisphere EEG activity during creative performance and that this pattern would not be found in less-creative people. All 3 experiments supported this prediction. This difference in asymmetry was specific to creative performance. It was not present during basal recordings or during a non-creative task.