Sources of exposure to smoking and drinking friends among adolescents: a behavioral-genetic evaluation

Substance-using friends expose adolescents to models of, and opportunities for, substance use that may lead to its initiation or reinforce existing use. Using genetically informative data from the National Longitudinal Study of Adolescent Health (P. S. Bearman, J. Jones, & J. R. Udry, 1998), the authors examined whether adolescents' exposure to friends' tobacco smoking and alcohol drinking was better explained by family-social or genetic influences. To conduct analyses, the authors constructed substance use exposure scores for adolescent siblings from the responses of siblings' nominated friends to self-reported smoking and drinking items. Using behavioral-genetic analyses of these substance use exposure scores, the authors estimated that 64% of the variance in adolescents' exposure to friends who smoke and drink could be explained by genetic influences, whereas shared environmental influences were zero. These results provide evidence of active, evocative, or both types of gene-environment correlations. Genetic factors can influence the formation of friendships with substance-using peers, thereby contributing to adolescents' exposure to substance use behaviors.     

Characterizing the motor execution stage of speech production: consonantal effects on delayed naming latency and onset duration

The research described in this article had 2 aims: to permit greater precision in the conduct of naming experiments and to contribute to a characterization of the motor execution stage of speech production. The authors report an exhaustive inventory of consonantal and postconsonantal influences on delayed naming latency and onset acoustic duration, derived from a hand-labeled corpus of single-syllable consonant-vowel utterances. Five talkers produced 6 repetitions each of a set of 168 prepared monosyllables, a set that comprised each of the consonantal onsets of English in 3 vowel contexts. Strong and significant effects associated with phonetic characteristics of initial and noninitial phonemes were observed on both delayed naming latency and onset acoustic duration. Results are discussed in terms of the biomechanical properties of the articulatory system that may give rise to these effects and in terms of their methodological implications for naming experiments.     

Switching between environmental representations in memory

In everyday life we accomplish tasks that require the storage and access of mental representations of different environments that we are not currently perceiving. Past research has suggested that environments are encoded by a series of independent representations that are organized in memory. Three experiments tested this idea further by asking whether multiple representations of environments can be accessed simultaneously. Using a cued task-set switching paradigm, subjects judged spatial relationships between target locations in two familiar environments. Response times were longer when successive trials probed different environments, an effect not due to switching between semantic categories or semantic priming, suggesting that representations of environments are accessed sequentially. Implications for various hypotheses concerning the properties of environmental representations are discussed.     

Presentism: Foreigner-Friendly or Xenophobic?

I argue that, for all we know, there are perfectly ordinary actual entities that are temporal in the usual sense and yet never present, past, or future. This epistemic fact requires us to modify the theses of presentism and eternalism. More importantly, it generates three new and quite serious objections to presentism, which I formulate and partially evaluate in this paper.     

Degrees and Dimensions of Rightness: Reflections on Martin Peterson’s Dimensions of Consequentialism

Martin Peterson argues for two interesting and appealing claims: multi-dimensionalism and degrees of rightness. Multi-dimensionalism is the view that more than one factor determines whether an act is right. According to Peterson’s multi-dimensionalism, these factors are not simply ways of achieving some greater aggregate good. Degrees of rightness is the view that some actions are more wrong or less right than others without being entirely wrong. It is of course, compatible with this, that some actions are right or wrong to a maximal degree, or entirely right or wrong. Multi-dimensionalism and degrees are taken to be intertwined. On Peterson’s view, if there were only one dimension, we wouldn’t need degrees; where only one dimension applies, an act is entirely right or entirely wrong. Peterson claims that degrees of rightness or wrongness arise only because there are multi-dimensions, and that an act cannot be entirely right if it is wrong on some dimension. I shall argue against both of these claims.     

Response to Stuart Kauffman: The Paradox of Divine Action and Scientific Truth

We three authors compare and contrast Stuart Kauffman's concept of the “cosmic mind” with similar ideas developed in our recent book, The Unity of Truth: Solving the Paradox of Science and Religion (IUniverse, 2012). Albert Einstein was known to have said: “Science without religion is lame, religion with science is blind.” We authors make use of the “paradox resolution” methods of physics to find a non-conflicting method by which God's actions communicate with human beings without violating any of the laws of science. The “communications paradox” is resolved by hypothesizing non-causal quantum-mechanical measurements as the way God communicates. the quantum-mechanical resolution of the “communications paradox” is completely consistent with both theist belief and the laws of science, whereas Kauffman's “cosmic mind” concept is seen to be consistent with pantheism.