Although quantum theory is applicable, in principle, to both the microscopic and macroscopic realms, the strategy of practically applying quantum theory by retaining a classical conception of the macroscopic world has had tremendous success. This has nevertheless rendered the task of interpretation daunting. We argue the need for recognizing and solving the ‘observation problem', namely constructing a ‘quantum-compatible’ view of the properties and states of macroscopic objects in everyday thinking to realistically interpret quantum theory consistently at both the microscopic and (...) macroscopic levels. Toward a solution to this problem, we point out a category of properties called ‘relational properties’ that we regularly associate with everyday objects. We see them as being potentially quantum-compatible. Some possible physical implications are discussed. We conclude by touching upon the nexus between the relational property view within quantum physics and some neurobiological issues underlying cognition. (shrink)

In other words, classically, probabilities add; quantum mechanically, the probability amplitudes add, leading to the presence of the extra product terms in the quantum case. What this means is that in quantum theory, even though always only one of the various outcomes is obtained in any given observation, some aspect of the non -occurring events, represented by the corresponding complex-valued quantum amplitudes, plays a role in determining the overall probabilities. Indeed, the observed quantum interference effects are correctly captured by the (...) quantum statistical description only because of the presence of these product terms. Therefore, in a realistic construal of quantum theory, if we treat the superposed Ψ function as representing the real state of an individual quantum system, these quantum amplitudes need to be given an ontological status. (shrink)

The attitude that ordinary language description of experience is in fact a description of the world is called “naïve realism.” There is an entire branch of modern Western philosophy that is devoted to critically examining the assumptions behind the everyday language we use to describe the macroscopic world in which we live and the validity of naïve realism as an adequate description of the world. This branch of philosophy is called “ordinary language philosophy.” Surprisingly, it has something in common with (...) quantum physics: insight into the inadequacy of ordinary language to describe observable reality. It is this connection between ordinary language philosophy and quantum physics that we shall explore in this article. In the process, we shall also offer a basic introduction to both basic philosophy and basic quantum theory. (shrink)