3,199 research outputs found
Local sublattice-symmetry breaking in rotationally faulted multilayer graphene
Interlayer coupling in rotationally faulted graphene multilayers breaks the
local sublattice-symmetry of the individual layers. We present a theory of this
mechanism, which reduces to an effective Dirac model with space-dependent mass
in an important limit. It thus makes a wealth of existing knowledge available
for the study of rotationally faulted graphene multilayers. We demonstrate
quantitative agreement between our theory and a recent experiment.Comment: Valley dependence in Eqs. (2) and (7) corrected; coordinates x and y
interchanged in the appendi
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Telomere length as a predictor of emotional processing in the brain
Shorter telomere length (TL) has been associated with the development of mood disorders as well as abnormalities in brain morphology. However, so far, no studies have considered the role TL may have on brain function during tasks relevant to mood disorders. In this study, we examine the relationship between TL and functional brain activation and connectivity, while participants (n = 112) perform a functional magnetic resonance imaging (fMRI) facial affect recognition task. Additionally, because variation in TL has a substantial genetic component we calculated polygenic risk scores for TL to test if they predict face-related functional brain activation. First, our results showed that TL was positively associated with increased activation in the amygdala and cuneus, as well as increased connectivity from posterior regions of the face network to the ventral prefrontal cortex. Second, polygenic risk scores for TL show a positive association with medial prefrontal cortex activation. The data support the view that TL and genetic loading for shorter telomeres, influence the function of brain regions known to be involved in emotional processing
A longitudinal study assessing depression in hepatitis C: does gender play a role in the new onset depression during interferon-alpha treatment?
No description supplie
The endorsement of dysfunctional attitudes is associated with an impaired retrieval of specific autobiographical memories in response to matching cues
Two studies investigated a hypothesis of Dalgleish et al. (2003) that overgeneral memory may arise from matching between task cues and dysfunctional attitudes or schemas. In the first study, 111 euthymic patients with at least two previous major depressive episodes completed the Dysfunctional Attitude Scale: Form A (DAS-A) and the Autobiographical Memory Test (AMT). In the second study, 82 patients with a borderline personality disorder completed the Young Schema Questionnaire (YSQ) and the same version of the AMT. In both studies, patients retrieved less specific autobiographical memories in response to cue words that matched highly endorsed attitudes or schemas. These results suggest that an impaired retrieval of specific memories may be the result of certain cues activating generic, higher-order mental representations
Strengthening Competence of Therapists-in-Training in the Treatment of Health Anxiety (Hypochondriasis): Validation of the Assessment of Core CBT Skills (ACCS)
Although the observation and assessment of psychotherapeutic competences is central to training, supervision, patient care, quality control, and life‐long practice, structured instruments are used only occasionally. In the current study, an observation‐based tool for the Assessment of Core CBT Skills (ACCS) was translated into German and adapted, and its psychometric properties were pilot evaluated. Competence of therapists‐in‐training was assessed in a random sample of n = 30 videos on cognitive‐behavioral therapy including patients diagnosed with hypochondriasis. Two of three raters independently assessed the competences demonstrated in the entire, active treatment sessions (n = 60). In our sample, internal consistency was excellent, and interrater reliability was good. Convergent validity (Cognitive Therapy Scale) and discriminant validity (Helping Alliance Questionnaire) were within the expected ranges. The ACCS total score did not significantly predict the reduction of symptoms of hypochondriasis, and a one‐factorial structure of the instrument was found. By providing multiple opportunities for feedback, self‐reflection and supervision, the ACCS may complement current tools for the assessment of psychotherapeutic competences and importantly, support competence‐based training and supervision
Cognitive conflicts in major depression : Between desired change and personal coherence
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposesThe notion of intrapsychic conflict has been present in psychopathology for more than a century within different theoretical orientations. However, internal conflicts have not received enough empirical attention, nor has their importance in depression been fully elaborated. This study is based on the notion of cognitive conflict, understood as implicative dilemma (ID), and on a new way of identifying these conflicts by means of the Repertory Grid Technique. Our aim was to explore the relevance of cognitive conflicts among depressive patientsPeer reviewedFinal Published versio
Cognitive heuristics in borderline personality disorder across treatment: A longitudinal non-parametric analysis.
The development of a constructive therapeutic alliance may represent an important feature of interpersonal adaptation in clients with Borderline Personality Disorder (BPD). The present study explores cognitive heuristics as dynamic features of change in relationship with the therapeutic alliance in the treatment of BPD.
In total, N = 60 clients with BPD, are included in the present study. In the context of brief therapy, the therapeutic alliance (WAI) is assessed from the client and the therapist perspectives after each therapy session; cognitive heuristics are assessed three times (CERS). The data analyses are on the basis of non-parametric clusters (kml3d) linked with the therapeutic alliance.
The results showed that clusters of cognitive heuristics trajectories are linked with the client's therapeutic alliance (t(55) = 2.30, p = .03), but they remained unrelated with the evolution of the therapist's alliance.
These results are discussed with regard to the interpersonal adaptiveness of cognitive heuristics in the context of BPD undergoing treatment
Silicon intercalation into the graphene-SiC interface
In this work we use LEEM, XPEEM and XPS to study how the excess Si at the
graphene-vacuum interface reorders itself at high temperatures. We show that
silicon deposited at room temperature onto multilayer graphene films grown on
the SiC(000[`1]) rapidly diffuses to the graphene-SiC interface when heated to
temperatures above 1020. In a sequence of depositions, we have been able to
intercalate ~ 6 ML of Si into the graphene-SiC interface.Comment: 6 pages, 8 figures, submitted to PR
Metacognitive improvement and symptom change in a 3-month treatment for borderline personality disorder.
Recognizing and reflecting on one's own and other people's mental states represent a major difficulty for patients with borderline personality disorder (BPD). Only recently have studies begun exploring whether these capacities increase with successful therapies and if such an improvement is linked with outcome. The present study investigated whether metacognition would improve and if its improvement was related with symptom change in BPD patients.
The transcripts from the first and the penultimate session of a ten-session version of good psychiatric management were analysed with the MAS-R scale in a N = 37 BPD sample. Patients, selected from a previously published RCT (Kramer et al., 2014), were assigned either to the good psychiatric management treatment or to the same treatment with the addition of the Motive-Oriented Therapeutic Relationship (Caspar, 2007), a form of therapeutic relationship based on an individualized case formulation. Symptoms were assessed with the OQ-45.
Findings partially support the hypotheses. First, improvement in capacities to understand others' mind, to take a critical distance from one's own rigid and maladaptive beliefs, and to use behavioural and attentional strategies to face adversities is found in both treatment groups. Controlling for marital status, only the ability to differentiate between reality and representations remains significant. Second, no link between metacognitive change and symptom change during treatment is found. However, a link is observed between the increase in metacognition and symptom reduction at 6-month follow-up.
Results invite to further investigate the role of metacognition in therapy change through different modalities and in longer-term treatments.
The development of metacognitive processes and their links with symptom change were examined during a short-term treatment in 37 borderline patients Improvement was found in capacities to understand others' mind, to take a critical distance from own rigid and maladaptive beliefs, and to use behavioural and attentional strategies even in a short-term treatment Controlling for marital status, only the ability to take a critical distance from representations remained significant A link was observed between increase in metacognition and symptom reduction at 6-month follow-up Understanding and tailoring interventions to specific metacognitive difficulties could be associated with symptom change during treatment for BPD patients
Quantum States of Topologically Massive Electrodynamics and Gravity
The free quantum states of topologically massive electrodynamics and gravity
in 2+1 dimensions, are explicitly found. It is shown that in both theories the
states are described by infrared-regular polarization tensors containing a
regularization phase which depends on the spin. This is done by explicitly
realizing the quantum algebra on a functional Hilbert space and by finding the
Wightman function to define the scalar product on such a Hilbert space. The
physical properties of the states are analyzed defining creation and
annihilation operators.
For both theories, a canonical and covariant quantization procedure is
developed. The higher order derivatives in the gravitational lagrangian are
treated by means of a preliminary Dirac procedure.
The closure of the Poincar\'e algebra is guaranteed by the
infrared-finiteness of the states which is related to the spin of the
excitations through the regularization phase. Such a phase may have interesting
physical consequences.Comment: 21 page, latex, no figure
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