A fixed point theorem for the Weak Kleene valuation scheme

Journal of Philosophical Logic -     

Identifying hallmarks of consciousness in non-mammalian species

Most early studies of consciousness have focused on human subjects. This is understandable, given that humans are capable of reporting accurately the events they experience through language or by way of other kinds of voluntary response. As researchers turn their attention to other animals, "accurate report" methodologies become increasingly difficult to apply. Alternative strategies for amassing evidence for consciousness in non-human species include searching for evolutionary homologies in anatomical substrates and measurement of physiological correlates of conscious states. In addition, creative means must be developed for eliciting behaviors consistent with consciousness. In this paper, we explore whether necessary conditions for consciousness can be established for species as disparate as birds and cephalopods. We conclude that a strong case can be made for avian species and that the case for cephalopods remains open. Nonetheless, a consistent effort should yield new means for interpreting animal behavior.     

Sadness, suicide, and their association with video game and internet overuse among teens: results from the youth risk behavior survey 2007 and 2009

We investigated the association between excessive video game/Internet use and teen suicidality. Data were obtained from the 2007 and 2009 Youth Risk Behavior Survey (YRBS), a high school-based, nationally representative survey (N = 14,041 and N = 16,410, respectively). Teens who reported 5 hours or more of video games/Internet daily use, in the 2009 YRBS, had a significantly higher risk for sadness (adjusted and weighted odds ratio, 95% confidence interval = 2.1, 1.7-2.5), suicidal ideation (1.7, 1.3-2.1), and suicide planning (1.5, 1.1-1.9). The same pattern was found in the 2007 survey. These findings support an association between excessive video game and Internet use and risk for teen depression and suicidality.     

Split-Brain: What We Know Now and Why This is Important for Understanding Consciousness

Neuropsychology Review - Recently, the discussion regarding the consequences of cutting the corpus callosum (“split-brain”) has regained momentum (Corballis, Corballis, Berlucchi,...     

Subjective measures of implicit knowledge that go beyond confidence: Reply to Overgaard et al.

Overgaard, Timmermans, Sandberg, and Cleeremans (2010) ask if the conscious experience of people in implicit learning experiments can be explored more fully than just confidence ratings allow. We show that confidence ratings play a vital role in such experiments, but are indeed incomplete in themselves: in addition, use of structural knowledge attributions and ratings of fringe feelings like familiarity are important in characterizing the phenomenology of the application of implicit knowledge.     

Post-migration Education Among Recent Adult Immigrants to Canada

The present study examines post-migration educational investment by new immigrants to Canada from two perspectives. First, what are the factors that influence whether a new immigrant invests in post-migration education (PME)? Second, is investment in PME associated with improved earnings? The results indicate that younger immigrants from ??non-traditional?? source countries, who are already well educated, fluent in English or French, and worked in a professional or managerial occupation prior to migration are most likely to enroll in PME. But acceptance of previous work experience by Canadian employers lowers the likelihood of investing in PME. Family obligations also reduce the likelihood of participating in PME. Financial limitations are not found to affect participation in PME. The earnings effect of PME is dependent on the type of course undertaken. In the short term, job-related seminars lead to improved earnings growth, while post-secondary courses result in a period of deceased earnings growth. Policy implications are discussed.     

Detecting conscious awareness from involuntary autonomic responses

Can conscious awareness be ascertained from physiological responses alone? We evaluate a novel learning-based procedure permitting detection of conscious awareness without reliance on language comprehension or behavioural responses. The method exploits a situation whereby only consciously detected violations of an expectation alter skin conductance responses (SCRs). Thirty participants listened to sequences of piano notes that, without their being told, predicted a pleasant fanfare or an aversive noise according to an abstract rule. Stimuli were presented without distraction (attended), or while distracted by a visual task to remove awareness of the rule (unattended). A test phase included occasional violations of the rule. Only participants attending the sounds reported awareness of violations and only they showed significantly greater SCR for noise occurring in violation, vs. accordance, with the rule. Our results establish theoretically significant dissociations between conscious and unconscious processing and furnish new opportunities for clinical assessment of residual consciousness in patient populations.