The impact of cognitive interference on performance during prolonged sleep loss

Summary A study was conducted on the effects of off-task cognitions on performance during sleep deprivation. Subjects answered the Thought Occurrence Questionnaire, assessing their proneness to engage in off-task cognitions, and were deprived of sleep for 72 hours, during which they performed a variety of tasks including visual discrimination and three versions of a logical reasoning task in which cognitive load was varied systematically. In addition, every day subjects answered the Cognitive Interference Questionnaire, which taps off-task cognitions during the experiment. Results indicated that subjects who habitually engage in off-task cognitions performed worse during 72 hours of sleep loss than subjects who do not engage in such distracting activities. In addition, it was found that the engagement in off-task cognitions increased during the 72 hours of sleep loss and such an engagement was related to deficits in performance accuracy. The mechanisms of off-task cognitions and sleep loss underlying these effects are discussed.     

Speculation: Wild and sound

There is no original research without guessing or speculation. However, in science there are constraints on speculation: the latter must harmonize with the bulk of background knowledge and it must be testable in some way or other. In other words, it is false that in science “anything goes”, as epistemological anarchism claims.     

The relationship of probability of success and performance following unsolvable problems: Reactance and helplessness effects

The present study assessed the effects of amount of helplessness training and probability of success given prior to performance on motivational involvement and on subsequent task performance. Subjects were exposed to either high, low, or no helplessness training on a series of cognitive discrimination problems and were given instructions regarding the probability of success on those problems. In the low helplessness condition, subjects who received moderate probability of success exhibited higher motivation to perform, higher levels of frustration and hostility, and better performance than subjects in the no helplessness condition. In the high helplessness condition, subjects who received moderate or high probability of success exhibited higher motivational involvement and greater performance decrements in the subsequent task than did control subjects. The results are discussed within the context of Wortman and Brehm's theory of reactance and helplessness.     

Psychological Treatments for Mental Disorders in Children and Adolescents: A Review of the Evidence of Leading International Organizations

In recent decades, the evidence on psychological treatments for children and adolescents has increased considerably. Several organizations have proposed different criteria to evaluate the evidence of psychological treatment in this age group. The aim of this study was to analyze evidence-based treatments drawn from RCTs, reviews, meta-analyses, guides and lists provided by four leading international organizations. The institutions reviewed were the National Institute for Health and Care Excellence, the Society of Clinical Child and Adolescent Psychology (Division 53) of the American Psychological Association, Cochrane Collaboration and the Australian Psychological Society in relation to mental disorders in children and adolescents. A total of 137 treatments were analyzed for 17 mental disorders and compared to determine the level of agreement among the organizations. The results indicate that, in most cases, there is little agreement among organizations and that there are several discrepancies within certain disorders. These results require reflection on the meaning attributed to evidence-based treatments with regard to psychological treatments in children and adolescents. The possible reasons for these differences could be explained by a combination of different issues: the procedures or committees may be biased, different studies were reviewed, different criteria are used by the organizations or the reviews of existing evidence were conducted in different time periods.