Maturation of EEG power spectra in early adolescence: a longitudinal study

This study investigated the fine-grained development of the EEG power spectra in early adolescence, and the extent to which it is reflected in changes in peak frequency. It also sought to determine whether sex differences in the EEG power spectra reflect differential patterns of maturation. A group of 56 adolescents were tested at age 10 years and then at two further time-points approximately 18 months apart. The EEG was recorded during both eyes-closed and eyes-open conditions and Fourier transformed to provide estimates of absolute and relative spectral power at 0.5 Hz intervals from 0.5 to 40 Hz. The peak alpha frequency for each individual at each time-point was also determined for relative spectral power. Partial Least Squares (PLS) analysis was used to determine the combination of electrodes and frequencies that showed developmental change, or differed between the sexes. As a function of age, absolute delta and theta frequencies power decreased, and relative alpha2 and beta frequencies increased, replicating the standard findings of a decrease in lower, and increase in higher, frequencies with age. A small but significant increase in peak alpha frequency with age was detected. Moreover PLS analysis performed with individual alpha frequencies aligned to 10 Hz suggested that the age-related increase seen in alpha2 relative power was driven by changes in the peak frequency. Although males demonstrated higher alpha power than females, there were no sex differences in peak frequency, suggesting that there may be more to sex differences in EEG power than simply different rates of maturation between the two sexes.     

Depression and Anxiety in Older and Middle‐aged Adults With Diabetes

This study aims to compare rates of depressive and anxious symptoms among older adults with and without diabetes. The study also examines differences in depression, anxiety, and diabetes‐related emotional distress between middle‐aged and older adults with diabetes. A total of 224 participants completed a range of questionnaires measuring depression, anxiety, and diabetes‐related emotional distress (if applicable). One hundred and three adults with diabetes (55 middle‐aged, mean age = 47 years, range 40–59 years and 48 older, mean age = 69 years, range 60–81 years) were recruited from a tertiary diabetes clinic. One hundred and twenty‐one adults without diabetes (72 middle‐aged, mean age = 52 years, range 40–59 years and 49 older, mean age = 65 years, range 60–76 years) were recruited from either a university student pool or a registry of adults aged 50 and above. Older adults with diabetes had significantly higher levels of depression and comparable levels of anxiety with older adults without diabetes. Older adults with diabetes had significantly lower levels of depression, anxiety, and diabetes‐related distress than middle‐aged adults with diabetes. Diabetes is associated with high rates of depression and anxiety, with middle‐aged adults more adversely affected than older adults.     

Metaphysical Nihilism and Cosmological Arguments: Some Tractarian Comments

Abstract: This paper explores the relevance of themes from Wittgenstein's Tractatus Logico‐Philosophicus to the ongoing discussion of metaphysical nihilism. I set out by showing how metaphysical nihilism is of paramount importance for cosmological arguments. Metaphysical nihilism is the position that there might have been nothing. Two conflicting intuitions emerge from a survey of discussions of metaphysical nihilism: Firstly, that metaphysical nihilism is true, and secondly, that formulations of the position are somehow unclear or nonsensical. By considering formalizations of philosophical language, the second intuition is sharpened, while the first intuition is given expression through the Tractarian distinction between what is said and what is shown by our symbolism. I conclude by exploring and rejecting objections to making metaphysical nihilism a scientific, rather than a philosophical question.     

Psychiatric distress and symptoms of PTSD among victims of bullying at work

Distress and symptoms of Post-Traumatic Stress Disorder (PTSD) were investigated among targets of experienced bullying at work, that is, the exposure to persistent or recurrent oppressive, offensive, abusive behaviour where the aggressor may be a superior or a colleague. The participants in the present study were all recruited from two associations of bullied victims (n=102, response rate=57%). A high level of distress and symptoms of PTSD was revealed in the sample, both according to recommended cut point scores for HSCL-25, PTSS-10 and IES-R, and when comparing the sample with traumatised samples. Three out of four victims reported an HSCL-25 level higher than the recommended threshold for psychiatric disease. Sixty and 63% of the sample reported a high level of IES intrusion and IES avoidance, correspondingly. The level of bullying, operationalised as the frequency of negative acts the individual had been exposed to at work, showed a stronger interconnection with distress and PTSD than a more unspecified, subjective measure of bullying, as well as the time since the bullying took place and the duration of the bullying episode. Those still being pestered reported a higher level of distress and PTSD than victims in which the bullying episodes were terminated more than 1 year ago, but the findings were somewhat mixed. Positive affectivity (PA) and especially negative affectivity (NA) contributed significantly to the explained variance of distress and PTSD in various regression analysis models, but did not interact with measures of bullying. Nor were mediator effects found between bullying, PA/NA and traumatic stress reactions. Implications of the findings are discussed.