How the eye measures reality and virtual reality

If virtual reality systems are to make good on their name, designers must know how people perceive space in natural environments, in photographs, and in cinema. Perceivers understand the layout of a cluttered natural environment through the use of nine or more sources of information, each based on different assumptions—occlusion, height in the visual field, relative size, relative density, aerial perspective, binocular disparities, accommodation, convergence, and motion perspective. The relative utility of these sources at different distances is compared, using their ordinal depth-threshold functions. From these, three classes of space around a moving observer are postulated: personal space, action space, and vista space. Within each, a smaller number of sources act in consort, with different relative strengths. Given the general ordinality of the sources, these spaces are likely to be affine in character, stretching and collapsing with viewing conditions. One of these conditions is controlled by lens length in photography and cinematography or by field-of-view commands in computer graphics. These have striking effects on many of these sources of information and, consequently, on how the layout of a scene is perceived.     

Modeling reality

My aim in this paper is to articulate an account of scientific modeling that reconciles pluralism about modeling with a modest form of scientific realism. The central claim of this approach is that the models of a given physical phenomenon can present different aspects of the phenomenon. This allows us, in certain special circumstances, to be confident that we are capturing genuine features of the world, even when our modeling occurs independently of a wholly theoretical motivation. This framework is illustrated using a recent debate from meteorology.     

Tokenism or reality

Journal of Contemporary Psychotherapy -     

Medicine's symbolic reality

Modern socio‐cultural studies of medicine demonstrate the symbolic character of much of medical reality. This symbolic reality can be appreciated as mediating the traditional division of medicine into biophysical and human sciences. Comparative studies of medical systems offer a general model for medicine as a human science. These studies document that medicine, from an historical and cross‐cultural perspective, is constituted as a cultural system in which symbolic meanings take an active part in disease formation, the classification and cognitive management of illness, and in therapy. Medicine's symbolic reality also forms a bridge between cultural and psychophysiological phenomena; the basis for psychosomatic and socioso‐matic pathology and therapy. This in turn becomes a central problem for medical theory and for a philosophical reinvestigation of medicine.     

Countertransference and reality

The psychoanalytic situation provides many opportunities for people to observe their analysts closely. These observations are inevitably woven into the fabric of patients’ transference experience. Because the observations can be uncomfortable for the analyst, there is a constant temptation to ignore or deny the plausibility of patients’ perceptions. They can be, and often are, quickly reinterpreted as derivatives of sexual or aggressive urges. Psychoanalytic drive theory, with its emphasis on impulse rather than observation as the force behind transference experience, can encourage counter‐transferential disclaimers and lead to blind spots. Some technical suggestions are offered to avoid this tendency and are based on a relational understanding of the nature of transference.     

Memory and reality

Although it may be disconcerting to contemplate, true and false memories arise in the same way. Memories are attributions that we make about our mental experiences based on their subjective qualities, our prior knowledge and beliefs, our motives and goals, and the social context. This article describes an approach to studying the nature of these mental experiences and the constructive encoding, revival, and evaluative processes involved (the source monitoring framework). Cognitive behavioral studies using both objective (e.g., recognition, source memory) and subjective (e.g., ratings of memory characteristics) measures and neuroimaging findings are helping to clarify the complex relation between memory and reality. ((c) 2006 APA, all rights reserved).     

Flirting with virtual reality

Psychoanalysis encourages patients to experience a virtual reality of the psychoanalytic relationship, in which both image and wish can be experimented with. Originally, the patient's awareness was supposed to move back and forth between the virtual and the actual, in a flickering and uncertain fashion. That is uncomfortable, and analysts have often preferred the domain of virtuality or of actuality, or have denied the distinction altogether. Recent philosophical developments and doubts about transference neurosis and reconstruction further tempt analysts to relax the flickering uncertainty of virtual and actual. Patient and analyst may gain comfort but lose something in the process.     

The reality of absences

In this paper, I make a contribution to a naturalistically-minded theory of truthmakers by proposing a solution to the nasty problem of truthmakers for negative truths. After formulating the difficulty, I consider and reject a number of solutions to the problem, including Armstrong's states of affairs of totality, incompatibility accounts, and JC Beall's polarity view. I then defend the position that absences of truthmakers are real and are responsible for making negative truths true (and positive falsehoods false). According to the positive account of absences I offer, absences of contingent states of affairs are causally relevant mind-independent features of the physical world, located within space and time, and capable of being discovered by scientific inquiry. Recognition of the reality of absences strengthens truthmaker theory as a naturalistic metaphysics, as truth and falsity of each and every contingent proposition finds an ontological grounding in some region of the physical universe.