Prevalence of suicidal ideation among boys and men assessed annually from ages 9 to 29 years

In a sample of 206 boys (90% Caucasian), self-reported suicidal ideation (SI; ages 12 to 29) and parent-reported youth suicidal talk (ages 9 to 20) were assessed annually by questionnaire. One-week point prevalence of self-reported SI ranged from 2.6% to 16.3%. New cases emerged across adolescence; by age 29, 57.3% self-reported SI at least once. SI was associated with clinically significant elevations on concurrent depressive symptoms. Nearly one quarter (24.8%) of parents reported suicidal talk by their son by age 20. Parent- and self-reports showed low correspondence. SI was more common than retrospective studies suggest. Parent-reports and one-time self-reports are likely to miss large numbers of adolescent boys who may be at risk.     

Freedom immediately after Kant

Kant's effort to defend the co‐existence of transcendental freedom and natural necessity is one of the crowning achievements of the first Critique. Yet by identifying the will with practical reason in his moral philosophy, he lent support to the view that the moral law is the causal law of a free will—the result of which, as Reinhold argued, left immoral action impossible. However, Reinhold's attempt to separate the will from practical reason generated difficulties of its own, which Maimon was quick to point out. By identifying freedom with indifferent choice, Maimon argued, Reinhold had no resources to explain why a free will acts at all. My aim in this article is to show how Fichte's theory of freedom seeks to reconcile these two commitments: The key lies in what I call Fichte's Genetic Model, according to which indifferent choice is the original condition of the will, but a condition we must actively overcome.     

CHARLES LYELL,UNIFORMITARIANISM, AND INTERPRETIVE PRINCIPLES

I examine the development of Charles Lyell's principle of uniformity and its influence on the development of modern geology and biology and argue that distinguishing between philosophical starting points and empirical findings is essential for clarity in the discussion between science and religion. First, I explore Lyell's arguments against catastrophism and how these were both empirically and religiously motivated. I then consider how David Hume's empiricism, theory of causation, and rejection of miracles influenced Lyell. Using these insights, Lyell formulated his principle of uniformity, which he believed was based on current empirical findings, and rejected explanatory hypotheses that used the biblical Flood or other catastrophist accounts as violations of uniform causation and introductions of theological concepts into empirical science. I next examine the influence of Lyell's principle on Charles Darwin. Although Lyell opposed Darwinism for most of his life, Darwin relied heavily on Lyell, as is evidenced by references throughout The Origin of Species. I contend that the most important aspect of Lyell's principle for Darwin is that it makes natural evil (the struggle for survival) a process that has always been occurring rather than something introduced after the Fall as recorded in Genesis. Finally, I discuss the role that uniformity plays for Lyell, Darwin, and modern science as an interpretive principle rather than as an inference from empirical data, and I conclude by noting that keeping the distinction in mind between interpretive principles and empirical findings will help clarify debates between science and religion.     

Frames of reference in mobile augmented reality displays

In 3 experiments, the authors investigated spatial updating in augmented reality environments. Participants learned locations of virtual objects on the physical floor. They were turned to appropriate facing directions while blindfolded before making pointing judgments (e.g., "Imagine you are facing X. Point to Y"). Experiments manipulated the angular difference between the learning heading and the imagined heading and between the actual heading and the imagined heading. The effect of actual-imagined on pointing latency was observed for naive users but not for users with brief training or instructions concerning the fact that objects can move with body movements. The results indicated that naive users used an environment-stabilized reference frame to access information arrays, but with experience and instruction the nature of the representation changed from an environment stabilized to a body stabilized reference frame.     

Continuity of parenting practices across generations in an at-risk sample: a prospective comparison of direct and mediated associations

A prospective model of parenting and externalizing behavior spanning 3 generations (G1, G2, and G3) was examined for young men from an at-risk sample of young adult men (G2) who were in approximately the youngest one third of their cohort to become fathers. It was first predicted that the young men in G2 who had children the earliest would show high levels of antisocial behavior. Second, it was predicted that G1 poor parenting practices would show both a direct association with the G2 son's subsequent parenting and a mediated effect via his development of antisocial and delinquent behavior by adolescence. The young fathers had more arrests and were less likely to have graduated from high school than the other young men in the sample. Findings were most consistent with the interpretation that there was some direct effect of parenting from G1 to G2 and some mediated effect via antisocial behavior in G2.     

Heterosexual risk behaviors in at-risk young men from early adolescence to young adulthood: prevalence,prediction, and association with STD contraction

Health-compromising lifestyles involve stable patterns of behavior and are associated with high-risk social environments and accelerated developmental trajectories. Developmentally, antisocial behavior is associated with such lifestyles. Mediational models predicting a measure of lifetime average sexual risk behavior assessed over a 10-year period (from ages 13-14 to 22-23 years) were examined for a sample of at-risk young men. The measure included years of abstinence from intercourse as well as levels of 3 key heterosexual indicators of risk: frequency of intercourse, number of intercourse partners, and condom use. Predictors included lifetime average measures of contextual, family, and peer process variables and individual behaviors. In addition, similar models for prediction of STD contraction were assessed. A younger age of onset of intercourse was associated with higher numbers of intercourse partners after onset. As hypothesized, findings indicated mediational associations of socioeconomic status, parental monitoring, deviant-peer association, antisocial behavior, and substance use in the prediction of sexual risk behavior. Lower condom use also predicted STD contraction.     

The effects of unilateral pulvinar damage in humans on reflexive orienting and filtering of irrelevant information

The effects of damage to the pulvinar nucleus of the thalamus in humans on reflexive orienting and selective attention were investigated. In a spatial orienting task three patients with unilateral pulvinar damage determined the location of a visual target that followed a cue that was not informative as to the targets location. Contralesional targets were responded to more slowly than ipsilesional targets. Also, at long cue target intervals patients responses to contralesional targets that appeared at previously cued locations were slower than to non-cued locations indicating that pulvinar damage does not affect inhibition of return. In the selective attention task two of the patients identified a target that appeared at one level of a global-local hierarchical stimulus while ignoring a distractor present at the other level. The distractor indicated either the same response as the target or a different response. Response times to targets in both visual fields were similar as were interference effects from the ignored distractors. These data indicate that engaging attention contralesionally is not impaired in discrimination tasks and that filtering of irrelevant information was not impaired contralesionally.