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norskBlar i forfatter Institutt for psykologi "Aslaksen, Per M"
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The antidepressant effect of intermittent theta burst stimulation (iTBS): study protocol for a randomized double-blind sham-controlled trial
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-02)Background Intermittent theta burst stimulation (iTBS) when applied over the left dorsolateral prefrontal cortex (DLPFC) has been shown to be equally effective and safe to treat depression compared to traditional repetitive transcranial magnetic stimulation (rTMS) paradigms. This protocol describes a funded single-centre, double-blind, randomized placebo-controlled, clinical trial to investigate ... -
Blame it on the weather? The association between pain in fibromyalgia, relative humidity, temperature and barometric pressure
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-10)Self-reported pain levels in patients with fibromyalgia may change according to weather conditions. Previous studies suggest that low barometric pressure (BMP) is significantly related to increased pain, but that the contribution of changes in BMP has limited clinical relevance. The present study examined whether BMP influenced variability in perceived stress, and if stress levels moderated or ... -
Blinding is compromised for transcranial direct current stimulation at 1 mA for 20 min in young healthy adults
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-03-19)Transcranial direct current stimulation (tDCS) is a non‐invasive brain stimulation method that is frequently used to study cortical excitability changes and their impact on cognitive functions in humans. While most stimulators are capable of operating in double‐blind mode, the amount of discomfort experienced during tDCS may break blinding. Therefore, specifically designed sham stimulation protocols ... -
Cerebral cortical thickness and surface area in adolescent anorexia nervosa: Separate and joint analyses with a permutation-based nonparametric method
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-17)<i>Objective</i> - Reduction in cerebral volume is often found in underweight patients with anorexia nervosa (AN), but few studies have investigated other morphological measures. Cortical thickness (CTh) and surface area (CSA), often used to produce the measure of cortical volume, are developmentally distinct measures that may be differentially affected in AN, particularly in the developing brain. ... -
Commentary: Transcranial stimulation of the frontal lobes increases propensity of mind-wandering without changing meta-awareness
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-02-05)A Commentary on <p> <p>Transcranial stimulation of the frontal lobes increases propensity of mind-wandering without changing meta-awareness<p> <p>by Axelrod, V., Zhu, X., & Qui, J. (2018). <i>Scientific Reports</i>, 8:15975. doi: 10.1038/s41598-018-34098-z -
Developing a model for measuring fear of pain in Norwegian samples: The Fear of Pain Questionnaire Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-01)<p><i>Background - </i>Fear of pain is highly correlated with pain report and physiological measures of arousal when pain is inflicted. The Fear of Pain Questionnaire III (FPQ-III) and The Fear of Pain Questionnaire Short Form (FPQ-SF) are self-report inventories developed for assessment of fear of pain (FOP). A previous study assessed the fit of the FPQ-III and the FPQ-SF in a Norwegian non-clinical ... -
Failure to Find a Conditioned Placebo Analgesic Response
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-30)<p><i>Background</i>: Associative learning has, in several studies, been modulated by the sex of the participant. Consistent with this, a recent review found that conditioned nocebo effects are stronger in females than in males.</p> <p><i>Purpose</i>: It has been suggested that conditioned placebo responses are stronger in females, and this hypothesis was investigated in the present study. Cortisol ... -
Hippocampal Subfields in Adolescent Anorexia Nervosa
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-25)Patients with anorexia nervosa (AN) exhibit volume reduction in cerebral gray matter (GM), and several studies report reduced hippocampus volume. The hippocampal subfields (HS) are functionally and structurally distinct, and appear to respond differently to neuropathology. The aim of this study was to investigate HS volumes in adolescent females with restrictive AN compared to a healthy age-matched ... -
Increasing propensity to mind‐wander by transcranial direct current stimulation? A registered report
(Journal article; Tidsskriftartikkel, 2019-01-24)Transcranial direct current stimulation (tDCS) has been proposed to be able to modulate different cognitive functions. However, recent meta‐analyses conclude that its efficacy is still in question. Recently, an increase in subjects’ propensity to mind‐wander has been reported as a consequence of anodal stimulation of the left dorsolateral prefrontal cortex (Axelrod et al., Proceedings of the National ... -
Internalizing problems and attentional control: Effects on cardiac autonomic responses after the induction of negative affect
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019)Individuals with internalizing problems differ in levels of attentional control (AC), and this heterogeneity could be associated with differences in autonomic arousal. The present study investigated whether AC moderated the effect of internalizing problems on self-reported experience and autonomic nervous system (ANS) responses after the induction of negative affect. Children aged 9–13 years were ... -
The Opioid Receptor Mu 1 (OPRM1) rs1799971 and Catechol-O-methyltransferase (COMT) rs4680 as genetic markers for placebo analgesia
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-16)The placebo effect is considered the core example of mind-body interactions. However, individual differences produce large placebo response variability in both healthy volunteers and patients. The placebo response in pain, placebo analgesia, may be dependent on both the opioid system and the dopaminergic system. Previous studies suggest that genetic variability affects the function of these 2 systems. ... -
The relation of hippocampal subfield volumes to verbal episodic memory measured by the California Verbal Learning Test II in healthy adults
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-06-08)Total hippocampal volume has previously been shown to correlate with performance on tests for verbal episodic memory. However, there are sparse evidence on how hippocampal subfield volumes are related to verbal episodic memory in healthy adults. The present study investigated the association between volumes of separate hippocampal subfields and verbal episodic memory performance in healthy volunteers. ...
