Supervenience and Physicalism

Discussion of the supervenience relation in the philosophical literature of recent years has become Byzantine in its intricacy and diversity. Subtle modulations of the basic concept have been tooled and retooled with increasing frequency, until supervenience has lost nearly all its original lustre as a simple and powerful tool for cracking open refractory philosophical problems. I present a conceptual model of the supervenience relation that captures all the important extant concepts (and suggests a few new ones) without ignoring the complexities uncovered during work over the past two decades. I test my analysis by applying it to the problem of defining physicalism, concluding that the thesis of physicalism is best captured by the conjunction of two supervenience relations. This revised version was published online in June 2006 with corrections to the Cover Date.     

Genetic and environmental influences on sexual orientation and its correlates in an Australian twin sample

We recruited twins systematically from the Australian Twin Registry and assessed their sexual orientation and 2 related traits: childhood gender nonconformity and continuous gender identity. Men and women differed in their distributions of sexual orientation, with women more likely to have slight-to-moderate degrees of homosexual attraction, and men more likely to have high degrees of homosexual attraction. Twin concordances for nonheterosexual orientation were lower than in prior studies. Univariate analyses showed that familial factors were important for all traits, but were less successful in distinguishing genetic from shared environmental influences. Only childhood gender nonconformity was significantly heritable for both men and women. Multivariate analyses suggested that the causal architecture differed between men and women, and, for women, provided significant evidence for the importance of genetic factors to the traits' covariation.     

Exploring Maternal Grief: A Mixed-Methods Investigation of Mothers’ Responses to the Death of a Child From Cancer

This study investigated the meaning-making phenomena underlying the responses of 13 bereaved mothers to the death of a child from cancer. Using a mixed-methods research design incorporating constructivist data collection methods, we found specific characteristics, coping processes, and factors to distinguish adaptive as opposed to complicated grief responses to this type of loss. However, the findings did not distinguish the bereaved mothers themselves as “adaptive” or “complicated grievers,” as they all evidenced both types of responses to their loss within or across different datasets. Despite this finding, the mothers’ results varied in terms of the proportions of adaptive as compared to complicated grief responses to their loss, which in turn were related to features of their self-construing, change or reinforcement of their world assumptions, ongoing relationship to their child and others in their social world, and management of loss- and restoration-oriented coping. Results suggest the utility of constructivist and cognitive coping models and methods in illuminating the experience of parental bereavement.