Online research in philosophy

Abstract. Presence is widely accepted as the key concept to be considered in any research involving human interaction with Virtual Reality (VR). Since its original description, the concept of presence has developed over the past decade to be considered by many researchers as the essence of any experience in a virtual environment. The VR generating systems comprise two main parts: a technological component and a psychological experience. The different relevance given to them produced two different but coexisting visions of presence: the rationalist and the psychological/ecological points of view. The rationalist point of view considers a VR system as a collection of specific machines with the necessity of the inclusion of the concept of presence. The researchers agreeing with this approach describe the sense of presence as a function of the experience of a given medium (Media Presence). The main result of this approach is the definition of presence as the perceptual illusion of non-mediation produced by means of the disappearance of the medium from the conscious attention of the subject. At the other extreme, there is the psychological or ecological perspective (Inner Presence). Specifically, this perspective considers presence as a neuropsychological phenomenon, evolved from the interplay of our biological and cultural inheritance, whose goal is the control of the human activity. Given its key role and the rate at which new approaches to understanding and examining presence are appearing, this chapter draws together current research on presence to provide an up to date overview of the most widely accepted approaches to its understanding and measurement.

The paper contains four arguments to show that experiences don't represent. The first argument appeals to the fact that an experience can't occur without what the experience is of; the second appeals to the fact we can have an experience without having any awareness of what it is of, the third argument appeals to the fact that long experiences, such as the experience of being kidnapped, don't represent anything; and the fourth appeals to the fact that experiences often leave physical traces. The author rebuts several arguments for the conclusion that experiences represent. The author also considers some of the pitfalls involved in stipulating that experiences represent in a technical sense of “experience” or “represent”.

Singularists about causation often claim that we can have experiences as of causation. This paper argues that regularity theorists need not deny that claim; hence the possibility of causal experience is no objection to regularity theories of causation. The fact that, according to a regularity theorist, causal experience requires background theory does not provide grounds for denying that it is genuine experience. The regularity theorist need not even deny that non-inferential perceptual knowledge of causation is possible, despite the fact that such knowledge would sometimes allow us to make inferences about what happens in far-off places and times.

We care for our own future experiences. Most of us, trivially, would rather have them pleasurable than painful. When we care for our own future experiences we do so in a way that is different from the way we care for those of others (which is not to say that we necessarily care more about our own experience). Prereflectively, one would think this is because these experiences will be ours and no one else's. But then, of course, we need to explain what it means to say that a future experience will be mine and how knowledge of this fact renders it rational for me to care for this experience in a special way. Indeed most philosophers take this route. But in doing so, they quickly stumble on insuperable problems. I shall argue that the problem of egocentric care, as it is sometimes called, can be solved by turning things upside down: it is much more fruitful to think that the special kind of care we feel for some future experiences (and not others) is part of what makes them ours should they occur. This requires an explanation of egocentric care for future experiences that does not draw in a theory of personal identity, but rather contributes to one. I will attempt to provide this explanation by making use of the idea of a diachronic mental holism.

According to the moving spotlight theory of time, the property of being present moves from earlier times to later times, like a spotlight shone on spacetime by God. In more detail, the theory has three components. First, it is a version of eternalism: all times, past present and future, exist. (Here I use “exist” in its tenseless sense.) Second, it is a version of the A-theory of time: there are nonrelative facts about which times are past, which time is present, and which times are future. That is, it is not just that the year 1066 is past relative to 2007. The year 1066 is also past full-stop, not relative to any other time. (The A-theory is opposed to the B-theory of time, which says that facts about which times are past are relative to other times.) And third, on this view the passage of time is a real phenomenon. Which moment is present keeps changing. As I will sometimes put it, the NOW moves from the past toward the future.1 And this does not mean that relative to different times, different times are present. Even the B-theory can say that 1999 is present relative to 1999 but is not present relative to 2007. No, according to the moving spotlight theory, the claim that which moment is present keeps changing is supposed to be true, even from a perspective outside time.

Tenseless theories of time entail that the only temporal properties exemplified by events are earlier than, simultaneous with, and later than. Such an account seems to conflict with our common experience of time, which suggests that the present moment is ontologically unique and that time flows. Some have argued that only a tensed account of time, one in which past, present and future are objective properties, can do justice to our experience. Any theory that claims that the world is different from how we experience it must nonetheless be consistent with the having of that experience. Accordingly, in this essay I defend the tenseless theory by arguing that it can indeed account for certain key features of our experience of time without recourse to tensed properties.

Diagram 1 shows three populations: A, B, and C. The width of each block represents the number of people, and the height represents their lifetime welfare. These populations could consist of all the past, present and future lives, or all the present and future lives, or all the lives during some shorter time span in the future such as the next generation, or all the lives that are causally affected by, or consequences of a certain action or series of actions, and so forth. All the lives in diagram 1 have positive welfare, or, as we also..

This commentary argues that the “illusion” to which Wegner refers in The Illusion of Conscious Will is actually the illusion that our conscious experience of mentally causing certain behaviors explains the behavior in question: It is not the subjective experience itself that is illusory, but the implied causal explanation. The experience of “mental effort” is cited as another example of this sort of illusion. Another significant example is the experience that properties of the representation of our mental images are responsible for certain patterns of behavior observed in mental imagery experiments. Examples include the increase in reaction time found when details are reported from smaller images or when attention is switched between different places and features (imagined as further apart than they are) within a single image. These examples illustrate the nature of the “illusion” involved: It is the illusion that certain observed regularities occur because of the content of the experience, as opposed to the converse – that experience has the content it does because of what the person figures out would happen in the imagined situation.

Philosophy has long struggled to understand the nature of color. The central role color plays in our lives, in visual experience, in art, as a metaphor for emotions, has made it an obvious candidate for philosophical reflection. Understanding the nature of color, however, has proved a daunting task, despite the numerous fields that contribute to the project. Even knowing how to start can be difficult. Is color to be understood as an objective part of reality, a property of objects with a status similar to shape and size? Or is color more like pain, to be found only in experience and so somehow subjective? Or is color more like what some have said about time--that it seems real until we reflect enough, where we come ultimately to dismiss it as mere illusion? If color is more like shape and size, can we give a scientific account of it? Various strategies exist for this option--taking the color of an object to be just a complicated texture of that object, one that reflects certain wavelengths. Or perhaps color is merely a disposition to cause experiences in us, as salt has a disposition to dissolve. On the other hand, if color is more like pain, and found only in subjective experience, what is the nature of color experience? How, for instance, does an experience of red differ from an experience of blue, or from an experience of pain for that matter? Finally, if color is mere illusion, how do we continue to be so taken in by that illusion and how can something unreal seem so real and important to us?

Introduction: free presence -- Conscious reference -- Fragile styles -- Real presence -- Experience of the world in time -- Presence in pictures -- On over-intellectualizing the intellect -- Ideology and the third realm.