Browsing Bergen Open Research Archive by Author "Grüner, Renate"

Now showing items 1-19 of 19

    • “Brain MR spectroscopy in autism spectrum disorder—the GABA excitatory/inhibitory imbalance theory revisited” 

      Brix, Maiken Kirkegaard; Ersland, Lars; Hugdahl, Kenneth; Grüner, Renate; Posserud, Maj-Britt; Hammar, Åse; Craven, Alexander R.; Noeske, Ralph; Evans, C. John; Walker, Hanne B.; Midtvedt, Tore; Beyer, Mona K. (Peer reviewed; Journal article, 2015-06-22)
      Magnetic resonance spectroscopy (MRS) from voxels placed in the left anterior cingulate cortex (ACC) was measured from 14 boys with Autism Spectrum Disorder (ASD) and 24 gender and age-matched typically developing (TD) ...

    • Brief international cognitive assessment for MS (BICAMS) and global brain volumes in early stages of MS – A longitudinal correlation study 

      Skorve, Ellen; Lundervold, Astri J.; Torkildsen, Øivind; Riemer, Frank; Grüner, Renate; Myhr, Kjell-Morten (Journal article; Peer reviewed, 2023)
      Background: Cognitive impairment is common in patients with multiple sclerosis, even in the early stages of the disease. The Brief International Cognitive Assessment for multiple sclerosis (BICAMS) is a short screening ...

    • A critical review of pro-cognitive drug targets in psychosis: convergence on myelination and inflammation 

      Kroken, Rune; Løberg, Else-Marie; Drønen, Tore; Grüner, Renate; Hugdahl, Kenneth; Kompus, Kristiina; Skrede, Silje; Johnsen, Erik (Peer reviewed; Journal article, 2014-02-04)
      Antipsychotic drugs have thus far focused on dopaminergic antagonism at the D2 receptors, as counteracting the hyperdopaminergia in nigrostriatal and mesolimbic projections has been considered mandatory for the antipsychotic ...

    • Default-mode network functional connectivity is closely related to metabolic activity 

      Passow, Susanne; Specht, Karsten; Adamsen, Tom Christian; Biermann, Martin; Brekke, Njål; Craven, Alexander R.; Ersland, Lars; Grüner, Renate; Kleven-Madsen, Nina; Kvernenes, Ole Heine; Schwarzlmüller, Thomas; Olesen, Rasmus Aamand; Hugdahl, Kenneth (Peer reviewed; Journal article, 2015-06)
      Over the last decade, the brain's default-mode network (DMN) and its function has attracted a lot of attention in the field of neuroscience. However, the exact underlying mechanisms of DMN functional connectivity, or more ...

    • Dynamic Susceptibility Contrast MRI May Contribute in Prediction of Stereotactic Radiosurgery Outcome in Brain Metastases 

      Starck, Lea; Skeie, Bente Sandvei; Moen, Gunnar; Grüner, Renate (Journal article; Peer reviewed, 2022)
      Background Following stereotactic radiosurgery (SRS), predicting treatment response is not possible at an early stage using structural imaging alone. Hence, the current study aims at investigating whether dynamic ...

    • Dynamic up- and down-regulation of thedefault (DMN) and extrinsic (EMN) modenetworks during alternating task-on and task-offperiods 

      Hugdahl, Kenneth; Kazimierczak, Katarzyna Anna; Beresniewicz, Justyna; Kompus, Kristiina; Westerhausen, René; Ersland, Lars; Grüner, Renate; Specht, Karsten (Peer reviewed; Journal article, 2019)
      Using fMRI, Hugdahl et al. (2015) reported the existence of a general-domain cortical network during active task-processing which was non-specific to the cognitive task being processed. They labelled this network the ...

    • The effects of alcohol intoxication on neuronal activation at different levels of cognitive load 

      Gundersen, Hilde; Grüner, Renate; Specht, Karsten; Hugdahl, Kenneth (Peer reviewed; Journal article, 2008-08-22)
      The aim of this study was to investigate how alcohol intoxication at two blood alcohol concentrations (BAC) affected neuronal activation during increasing levels of cognitive load. For this purpose we used functional ...

    • Effects of ECT in treatment of depression: Study protocol for a prospective neuroradiological study of acute and longitudinal effects on brain structure and function 

      Oltedal, Leif; Kessler, Ute; Ersland, Lars; Grüner, Renate; Andreassen, Ole Andreas; Haavik, Jan; Hoff, Per Ivar; Hammar, Åsa; Dale, Anders Martin; Hugdahl, Kenneth; Ødegaard, Ketil Joachim (Peer reviewed; Journal article, 2015-05-01)
      Background Major depression can be a serious and debilitating condition. For some patients in a treatment resistant depressive episode, electroconvulsive treatment (ECT) is the only treatment that is effective. Although ...

    • Effects of motion correction, sampling rate and parametric modelling in dynamic contrast enhanced MRI of the temporomandibular joint in children affected with juvenile idiopathic arthritis 

      Starck, Lea; Andersen, Erling; Macíček, Ondřej; Angenete, Oskar W; Augdal, Thomas Angell; Rosendahl, Karen; Jirík, Radovan; Grüner, Renate (Journal article; Peer reviewed, 2021)
      The temporomandibular joint (TMJ) is typically involved in 45–87% of children with Juvenile Idiopathic Arthritis (JIA). Accurate diagnosis of JIA is difficult as various clinical tests, including MRI, disagree. The purpose ...

    • Effects of Multi-Shell Free Water Correction on Glioma Characterization 

      Starck, Lea; Zaccagna, Fulvio; Pasternak, Ofer; Gallagher, Ferdia A.; Grüner, Renate; Riemer, Frank (Journal article; Peer reviewed, 2021)
      Diffusion MRI is a useful tool to investigate the microstructure of brain tumors. However, the presence of fast diffusing isotropic signals originating from non-restricted edematous fluids, within and surrounding tumors, ...

    • Increased microvascular proliferation is negatively correlated to tumour blood flow and is associated with unfavourable outcome in endometrial carcinomas 

      Haldorsen, Ingfrid S.; Stefansson, Ingunn; Grüner, Renate; Husby, Jenny Hild Aase; Magnussen, Inger Johanne; Werner, Henrica Maria Johanna; Salvesen, Øyvind; Bjørge, Line; Trovik, Jone; Taxt, Torfinn; Akslen, Lars A.; Salvesen, Helga Birgitte (Peer reviewed; Journal article, 2014)
      Background: We aimed to study the angiogenic profile based on histomorphological markers in endometrial carcinomas in relation to imaging parameters obtained from preoperative dynamic contrast-enhanced magnetic resonance ...

    • Interactive visual exploration of metabolite ratios in MR spectroscopy studies 

      Garrison, Laura; Vašíček, Jakub; Craven, Alexander R.; Grüner, Renate; Smit, Noeska Natasja; Bruckner, Stefan (Journal article; Peer reviewed, 2020)
      Magnetic resonance spectroscopy (MRS) is an advanced biochemical technique used to identify metabolic compounds in living tissue. While its sensitivity and specificity to chemical imbalances render it a valuable tool in ...

    • MedUse: A Visual Analysis Tool for Medication Use Data in the ABCD Study 

      Bartsch, Hauke; Garrison, Laura; Bruckner, Stefan; Wang, Ariel; Tapert, Susan F.; Grüner, Renate (Peer reviewed; Journal article, 2019)
      The RxNorm vocabulary is a yearly-published biomedical resource providing normalized names for medications. It is used to capture medication use in the Adolescent Brain Cognitive Development (ABCD) study, an active and ...

    • Memento: Localized time‐warping for spatio‐temporal selection 

      Solteszova, Veronika; Smit, Noeska Natasja; Stoppel, Sergej; Grüner, Renate; Bruckner, Stefan (Peer reviewed; Journal article, 2020)
      Interaction techniques for temporal data are often focused on affecting the spatial aspects of the data, for instance through the use of transfer functions, camera navigation or clipping planes. However, the temporal aspect ...

    • Multi-vendor standardized sequence for edited magnetic resonance spectroscopy 

      Saleh, Muhammad G.; Rimbault, Daniel; Mikkelsen, Mark; Oeltzschner, Georg; Wang, Anna M; Jiang, Dengrong; Alhamud, Ali; Near, Jamie; Schär, Michael; Noeske, Ralph; Murdoch, James B; Ersland, Lars; Craven, Alexander R.; Dwyer, Gerard Eric; Grüner, Renate; Pan, Li; Ahn, Sinyeob; Edden, Richard A.E. (Peer reviewed; Journal article, 2019)
      Spectral editing allows direct measurement of low-concentration metabolites, such as GABA, glutathione (GSH) and lactate (Lac), relevant for understanding brain (patho)physiology. The most widely used spectral editing ...

    • Multimodal imaging of gliomas in the context of evolving cellular and molecular therapies 

      Keunen, Olivier; Taxt, Torfinn; Grüner, Renate; Lund-Johansen, Morten; Tonn, Joerg-Christian; Pavlin, Tina; Bjerkvig, Rolf; Niclou, Simone P.; Thorsen, Frits Alan (Peer reviewed; Journal article, 2014-09-30)
      The vastmajority ofmalignant gliomas relapse after surgery and standard radio-chemotherapy. Novelmolecular and cellular therapies are thus being developed, targeting specific aspects of tumor growth.While histopathology ...

    • The NADPARK study: A randomized phase I trial of nicotinamide riboside supplementation in Parkinson’s disease 

      Brakedal, Brage; Dölle, Christian; Riemer, Frank; Ma, Yilong; Nido, Gonzalo Sanchez; Skeie, Geir Olve; Craven, Alexander R.; Schwarzlmüller, Thomas; Brekke, Njål; Diab, Joseph; Sverkeli, Lars Jansen; Skjeie, Vivian; Varhaug, Kristin Nielsen; Tysnes, Ole-Bjørn; Peng, Shichun; Haugarvoll, Kristoffer; Ziegler, Mathias; Grüner, Renate; Eidelberg, David; Tzoulis, Charalampos (Journal article; Peer reviewed, 2022)
      We conducted a double-blinded phase I clinical trial to establish whether nicotinamide adenine dinucleotide (NAD) replenishment therapy, via oral intake of nicotinamide riboside (NR), is safe, augments cerebral NAD levels, ...

    • No Effects of Anodal tDCS on Local GABA and Glx Levels in the Left Posterior Superior Temporal Gyrus 

      Dwyer, Gerard Eric; Craven, Alexander R.; Hirnstein, Marco; Kompus, Kristiina; Assmus, Jörg; Ersland, Lars; Hugdahl, Kenneth; Grüner, Renate (Peer reviewed; Journal article, 2019-01-08)
      A number of studies investigating the biological effects of transcranial direct current stimulation (tDCS) using magnetic resonance spectroscopy (MRS) have found that it may affect local levels of γ-aminobutyric acid (GABA), ...

    • Similarities and differences between intermittent and continuous resting-state fMRI 

      Beresniewicz, Justyna; Riemer, Frank; Kazimierczak, Katarzyna Anna; Ersland, Lars; Craven, Alexander R.; Hugdahl, Kenneth Jan; Grüner, Renate (Journal article; Peer reviewed, 2023)
      Introduction: Functional Magnetic Resonance Imaging (fMRI) block-design experiments typically include active ON-blocks with presentation of cognitive tasks which are contrasted with OFF- blocks with no tasks presented. ...