Developmental changes of sleep spindles and their impact on sleep‐dependent memory consolidation and general cognitive abilities: A longitudinal approach

Sleep spindles are related to sleep‐dependent memory consolidation and general cognitive abilities. However, they undergo drastic maturational changes during adolescence. Here we used a longitudinal approach (across 7 years) to explore whether developmental changes in sleep spindle density can explain individual differences in sleep‐dependent memory consolidation and general cognitive abilities. Ambulatory polysomnography was recorded during four nights in 34 healthy subjects (24 female) with two nights (baseline and experimental) at initial recording (age range 8–11 years) and two nights at follow‐up recording (age range 14–18 years). For declarative learning, participants encoded word pairs with a subsequent recall before and after sleep. General cognitive abilities were measured by the Wechsler Intelligence Scale. Higher slow (11–13 Hz) than fast (13–15 Hz) spindle density at frontal, central, and parietal sites during initial recordings, followed by a shift to higher fast than slow spindle density at central and parietal sites during follow‐up recordings, suggest that mature spindle topography develops throughout adolescence. Fast spindle density increases from baseline to experimental night were positively related to sleep‐dependent memory consolidation. In addition, we found that the development of fast spindles predicted the improvement in memory consolidation across the two longitudinal measurements, a finding that underlines a crucial role for mature fast spindles for sleep‐dependent memory consolidation. Furthermore, slow spindle changes across adolescence were related to general cognitive abilities, a relationship that could indicate the maturation of frontal networks relevant for efficient cognitive processing. A video abstract of this article can be viewed at: https://www.youtube.com/watch?v=7NXJzm8HbIw and https://www.youtube.com/watch?v=iuMQY1OIJ0s     

Changes in Late Adolescents and Young Adults’ Attachment,Separation, and Mental Health During Wilderness Therapy

The study explored changes in young adults’ mental health, attachment, and separation from parents during a seven-week wilderness therapy program. Utilizing a longitudinal one-group design, the study examined outcomes of 157 young adults in one wilderness therapy program. From pre to post treatment, participants reported significant improvement in mental health symptoms and interpersonal relationships, as well as increases in the belief that others can be depended upon. Participants reported less resentment and anger towards mothers from pre to post treatment, but an increase in their needs for approval from fathers. The study details a link between young adults’ attachment, independence from parents, and improvement in mental health, suggesting that treatment which targets these links may provide more effective intervention.     

A simplified version of the maximum information per time unit method in computerized adaptive testing

In this article, we propose a simplified version of the maximum information per time unit method (MIT; Fan, Wang, Chang, & Douglas, Journal of Educational and Behavioral Statistics 37: 655–670, 2012), or MIT-S, for computerized adaptive testing. Unlike the original MIT method, the proposed MIT-S method does not require fitting a response time model to the individual-level response time data. It is also computationally efficient. The performance of the MIT-S method was compared against that of the maximum information (MI) method in terms of measurement precision, testing time saving, and item pool usage under various item response theory (IRT) models. The results indicated that when the underlying IRT model is the two- or three-parameter logistic model, the MIT-S method maintains measurement precision and saves testing time. It performs similarly to the MI method in exposure control; both result in highly skewed item exposure distributions, due to heavy reliance on the highly discriminating items. If the underlying model is the one-parameter logistic (1PL) model, the MIT-S method maintains the measurement precision and saves a considerable amount of testing time. However, its heavy reliance on time-saving items leads to a highly skewed item exposure distribution. This weakness can be ameliorated by using randomesque exposure control, which successfully balances the item pool usage. Overall, the MIT-S method with randomesque exposure control is recommended for achieving better testing efficiency while maintaining measurement precision and balanced item pool usage when the underlying IRT model is 1PL.     

Effectiveness of a Cognitive Behavioral Intervention for Young Adults with Cystic Fibrosis

This study examined the effectiveness of a cognitive behavioral intervention for young adults with cystic fibrosis (CF). Four young adults were referred for the therapy by medical staff because of perceived problems with anxiety, anger, or coping. Treatment impact was assessed on measures of anxiety, anger, perceptions of functional disability, and coping. A multiple baseline design across subjects was used. Overall, the impact of the cognitive behavioral intervention for young adults with CF was mixed. If participants had elevated baseline scores on anxiety, anger, or perceived functional disability, then some improvement was shown. However, only one participant had elevated baseline anxiety and anger scores, while two had higher functional disability scores. For coping, only one participant clearly displayed a greater use of approach relative to avoidance coping by the end of treatment. Results are discussed in terms of treatment implications, assessment, and coping issues.     

The Journal of Multicultural Counseling and Development: Then,Now, and in the 21st Century

The results of a content analysis of volumes 18–22 of JMCD are presented and related to findings of 5 and 10 years earlier. Trends are identified along with issues for future development of the journal.     

Proactively balancing the validity and legal compliance of personal background measures in personnel management

Despite its proven utility and validity for the prediction of performance, the use of certain biodata questions for selection is being restricted because of fears of charges of discrimination, or of invasion of privacy, arising from increasingly stringent state and federal laws governing employment (Ash, 1989). The objective of this study was to develop alternative items that were valid and also perceived as nondiscriminatory and noninvasive for two biodata subscales in a well-researched biographical inventory. The newly developed subscales had acceptable KR-20 reliability coefficients. Sizeable and significant correlations between the corresponding original and newly developed subscales attested to the latter's construct validity. The performance criterion validity of the new subscales was demonstrated by significant correlations with both salary and with level of organizational functioning, which were regarded as measures of the individual's worth to the organization. The results of the present study encourage the expectation that biodata items can be constructed that are (1) valid, (2) in compliance, and (3) with a sufficiently low level of perceived invasiveness that will allow both the applicant and the test user to be comfortable with their use.     

Perception of clusters in statistical maps

Two experiments observed performance on a cluster identification task across a variety of common statistical maps. Stimulus maps displayed mortality rates for several diseases and subjects had to identify regions of the map that were perceived to form a cluster of particularly high (or low) mortality. Subjects marked the perceived centroid of each cluster, and analyses focused on the dispersion of centroid location across subjects. Under these circumstances, monochrome classed choropleth maps were found to minimize dispersion, compared to a two opposing colours scheme, a dot density map, a pie map, and a categorical (hue-based) colour scheme. Maps using a familiar geographical unit (i. e. a U. S. state) supported better recall of the information than maps using less familiar and smaller geographical units. The results were found to be interpretable within current cognitive theory.     

Predicting successful territory sales performance

The purpose of this study was to examine the validity of the London HouseSales Professional Assessment Inventory (SPAI) for identifying successful territory managers at a national food distribution company. Forty-seven territory managers with valid SPAI results and usable performance information comprised the sample. Statistical analyses were conducted to determine the relationships between results on the SPAI and year-to-date sales figures for a 10 month period. Territory managers recommended by the SPAI had $350,000 more in average year-to-date sales revenues than those not recommended. Finally, those scoring in the top 10% on the SPAI haddouble the amount in sales revenues of those not recommended. The results indicate that the SPAI is a valid instrument for use in predicting the successful performance of territory managers at a national food distribution company.     

Assisted dying: Why the Argument from Sufficient Palliation fails

Opponents of legalising assisted dying often make the Argument from Sufficient Palliation. On the premise that advances in palliative treatment have made it possible to free terminal patients from pain and distress, the argument concludes that assisted dying is unnecessary. I assert that this argument fails. Firstly, the premise is false because patients respond differently to analgesics and many continue to experience intractable pain even on medication. Secondly, the premise fails to acknowledge the extreme discomfort (for many patients) of the side effects of palliative treatment. Thirdly, the conclusion would only follow from the premise if the overwhelming majority of patients had access to palliative treatment, and this is patently not the case. Finally, the argument completely overlooks the enormous distress experienced by terminal patients, arising from perceived loss of dignity and concerns about being a burden to others.