Causal Overdetermination and Modal Compatibilism

Compatibilists respond to the problem of causal exclusion for nonreductive physicalism by rejecting the exclusionist’s ban on overdetermination. By the compatibilist’s lights there are two forms of overdetermination, one that’s problematic and another that is entirely benign. Furthermore, multiple causation by “tightly related” causes requires only the benign form of overdetermination. Call this the tight relation strategy for avoiding problematic forms of overdetermination. To justify the tight relation strategy, modal compatibilists appeal to a widely accepted counterfactual test. The argument of this paper is that the counterfactual test fails to legitimize the tight relation strategy as it fails to adequately distinguish between problematic and benign overdetermination. Contrary to modal compatibilists, modal dependence does not suffice for benignity. I conclude by arguing that adequately addressing overdetermination worries requires a much heavier metaphysical burden than modal compatibilists have typically recognized.     

The logical status of natural laws

In this note I have presented the essentials of a view of how laws are falsified, a view which has been held by some notable philosophers but which is radically opposed to that of Professor Popper. I have not scrupled to ‘improve? upon it, so the view of no one philosopher is presented. I try to show that an interesting and convincing account of scientific simplicity is implicit in the theory and I conclude by suggesting how we can bring the argument to bear on the problem of the logical status of laws of nature, showing that through their manner of falsifiability, laws share some characteristics with necessary statements as well as with empirical generalizations.     

A Multivariate Analysis of Psychographic Variables

This study examined the relationship between demographic and personality variables through the use of a multivariate technique, canonical analysis. The principal advantage of such a technique lies in its ability to simultaneously consider sets of variables rather than focusing narrowly in a single predictor or criterion variable. The four demographic variables examined, sex, age, education, and marital status, produced four statistically significant relationships with personality traits measured by the Edwards Personal Preference Schedule. These relations were examined and suggestions made as to how the results might be used to indicate areas for further research.     

The Siblings of Individuals with Mental Retardation: A Quantitative Integration of the Literature

The sibling relationship has recently become the focus of much research in developmental psychology. The family system perspective implies the presence of a sibling with mental retardation will impact on the psychological development and functioning of their typically developing siblings. Past reviews of the literature have found this impact to be negative but there is the suggestion of positive consequences to having a sibling with mental retardation. The present meta-analysis sought to quantitatively integrate 25 studies and 79 effect sizes from the literature on the siblings of individuals with mental retardation. A small negative effect for having a sibling with mental retardation was discovered that could not be attributed to a publication bias or some other artifact. This negative effect was greatest for direct observation measures, measures of psychological functioning, especially depression, and for children. Limitations to this meta-analysis and directions for future research are discussed.     

Assimilative hue shifts in color depend on bar width

Hue shifts were measured in isoluminant color gratings whose bar width was varied from 2′ to 20′ of visual angle. Subjects matched the hues in each grating with individual Munsell swatches. Hue shifts were largest for bar widths of 2′; however, they depended on the color combination used. Green and red shifted toward (i.e., assimilated with) whatever second grating color they were paired with. Blue, on the other hand, assimilated with red and with yellow, but remained relatively unchanged when combined with green. Yellow shifted only minimally, regardless of the second grating color. Hue shifts decreased with increasing stripe width and disappeared between 4.5′ and 7.5′. Compared with the assimilative hue shifts, color contrast effects were slight or absent. These results cannot be attributed merely to chromatic aberration, macular pigment, eye movements, or field size.