1,721,027 research outputs found
Retraction: overweight and cognitive performance: high body mass index is associated with impairment in reactive control during task switching
Full text linkA Retraction of the Original Research ArticleOverweight and Cognitive Performance:High BodyMass Index Is Associated with Impairment in Reactive Control during Task Switchingby Steenbergen, L., and Colzato, L. S. (2017). Front. Nutr. 4:51. doi: 10.3389/fnut.2017.00051The journal hereby retracts the above cited article. This follows the recommendations of an investigation by Leiden University's Committee on Scientific Integrity which found that the paper contained gross data manipulation. These issues could not have been detected during review but nevertheless invalidate the study's findings. The retraction has been approved by the journal Chief Editors.Action Contro
High vagally mediated resting-state heart rate variability is associated with superior action cascading
No full textThe neurovisceral integration model suggests that individual differences in heart rate variability (HRV), an index of vagal tone, may relate to prefrontal cortical activity and predict performance on cognitive control tasks. The aim of this study was to further verify this model by investigating the relationship between vagally-mediated resting-state HRV and action cascading, a crucial cognitive control function which refers to the ability to cope with multiple response options when confronted with various task goals. Resting-state HRV and performance on the stop-change paradigm, which provides a relatively well-established diagnostic measure of action cascading and response inhibition, was assessed in 88 healthy volunteers (age range 18–33). Compared to individuals with low resting-state HRV, participants with high resting-state HRV showed enhanced action cascading performance, both when a disruption (stopping) and change towards an alternative response were required simultaneously, and when requirements were cascaded (i.e. when the stopping process had already finished at the time the change was required). Our findings represent an important step towards extending our understanding of the neurovisceral integration model in cognitive control
gamma-Aminobutyric acid (GABA) administration improves action selection processes: a randomised controlled trial
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Tyrosine promotes cognitive flexibility: Evidence from proactive vs. reactive control during task switching performance
No full text“Unfocus” on foc.us: commercial tDCS headset impairs working memory
Full text link The Editors-in-Chief are issuing an editorial Expression of Concern for this article. An investigation by Universiteit Leiden has concluded that in the reporting of this study data from at least two participants were omitted or replaced without this being disclosed. However, the investigation was unable to determine the exact number of participants whose data were omitted or replaced. The first/corresponding author has stated that data from five participants were excluded prior to analysis due to poor task performance without this being disclosed. Readers should therefore interpret the results and conclusions with caution. All authors agree with this statement. Action Contro
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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