The Physical Unnaturalness of Churchland’s Ellipses
نویسندگان
چکیده
This paper addresses Paul Churchland’s (2007) attempt to identify colors with surface reflectance spectra. Of particular concern is Churchland’s novel method of approximating surface reflectance spectra. While those approximations are generated by objective means and yield a striking match with human phenomenological color space, they are not physically meaningful. The reason for this is that the method used to produce the approximations induces equivalence classes on surface reflectances that are not invariant under physically appropriate changes of measurement convention. This result undermines Churchland’s proposed response to the objection from metamers commonly raised against color physicalism, as his surface reflectance approximations are supposed to provide an objective, physical unifying basis for metamers.
منابع مشابه
Solvation Force of Ellipse-Shaped Molecules Moving in One Dimension and Confined between Two Parallel Planar Walls
The model fluids containing hard ellipses (HEs) and Gay-Berne (GB) particles where their center is moving in one dimension and confined between two parallel walls with different interactions are investigated using Monte Carlo simulation, NVT ensemble. The dependency of fluid pressure with respect to the wall distances is studied. The oscillatory behaviors are seen in this quantity against ...
متن کاملThinking as Evidence for the Probability of the Existence of a God: An Argument from Unnaturalness for Necessity
The objective of this article is to show that it is justified to assert that the existence of God is plausible, considering the fact that thinking itself is an immediate outcome (effect) of a thinker (cause). This idea may seem evident, but it is in fact challenged by certain claims of cognitive philosophers who aver that our knowledge of necessity and causation is, i...
متن کاملDynamics of sheared ellipses and circular disks: effects of particle shape.
Much recent effort has focused on glassy and jamming properties of spherical particles. Very little is known about such phenomena for nonspherical particles, and we take a first step by studying ellipses. We find important differences between the dynamical and structural properties of disks and two-dimensional ellipses subject to continuous Couette shear. In particular, ellipses show slow dynam...
متن کاملFormation of double glass in binary mixtures of anisotropic particles: dynamic heterogeneities in rotations and displacements.
We study glass behavior in a mixture of elliptic and circular particles in two dimensions at low temperatures using an orientation-dependent Lennard-Jones potential. The ellipses have a mild aspect ratio (∼1.2) and tend to align at low temperatures, while the circular particles play the role of impurities disturbing the ellipse orientations at a concentration of 20%. These impurities have a siz...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2009