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  • 1. Aminoff, Sofie R
    et al.
    Jensen, Jimmy
    University of Oslo & Oslo University Hospital.
    Lagerberg, Trine V
    Andreassen, Ole A
    Melle, Ingrid
    Decreased self-reported arousal in schizophrenia during aversive picture viewing compared to bipolar disorder and healthy controls.2011In: Psychiatry Research, ISSN 0165-1781, E-ISSN 1872-7123, Vol. 185, no 3, p. 309-314Article in journal (Refereed)
    Abstract [en]

    Both schizophrenia (SCZ) and bipolar disorder (BD) are associated with disturbances in emotion processing. Previous studies suggest that patients with SCZ assess unpleasant pictures as less arousing than healthy controls (HC), while patients with BD assess neutral pictures as more arousing than HC. No previous studies have investigated whether there is a difference in emotional response across all three groups. Our aim was to explore whether there was a difference in the evaluation of valence and in arousal between SCZ, BD and HC for aversive and neutral pictures. We showed 72 pictures (neutral, non-socially aversive and socially aversive) from the International Affective Picture System (IAPS) to 347 subjects. There was a clear interaction effect between the diagnostic group and increasing picture aversiveness for both valence and arousal. There were no significant differences in valence ratings between the different groups or in arousal ratings on any type of stimuli between BD patients and HC. However, SCZ patients reported significantly lower arousal for aversive stimuli, particularly with a social content, when compared to BD patients and HC. This was more pronounced in females. The presence of lifetime psychotic symptoms did not influence emotional responses.

  • 2. Aminoff, Sofie Ragnhild
    et al.
    Jensen, Jimmy
    Institute of Clinical Medicine, University of Oslo & Department of Psychiatry and Psychotherapy, Charité Universitätsmedizin, Berlin, Germany.
    Lagerberg, Trine Vik
    Hellvin, Tone
    Sundet, Kjetil
    Andreassen, Ole A
    Melle, Ingrid
    An association between affective lability and executive functioning in bipolar disorder.2012In: Psychiatry Research, ISSN 0165-1781, E-ISSN 1872-7123, Vol. 198, no 1, p. 58-61Article in journal (Refereed)
    Abstract [en]

    Studies suggest altered affect regulation manifested by affective lability in manic/mixed and euthymic states in patients with bipolar disorder (BD). Altered affect regulation may arise from disturbances in interactions between the cognitive and the emotional brain networks. However, the relationship between affective lability and executive function has not previously been studied. Our aim was to investigate affective lability, as measured with the Affective Lability Scale (ALS) in patients with BD (N=32) compared to healthy controls (HC) (N=60), and its relationship to executive functioning. We found significantly higher ALS scores in the BD than in the HC group, indicating a higher degree of affective lability in patients with BD. Sub-sample analysis revealed a significant positive relationship between affective lability and semantic set shifting abilities in BD only. These findings suggest that higher levels of affective lability compared with controls are a trait as well as state dependent in BD, and that disturbed affective lability may arise from an aberrant interaction between cognitive and emotional brain networks.

  • 3.
    Haatveit, Beathe
    et al.
    University of Oslo.
    Vaskinn, Anja
    University of Oslo.
    Sundet, Kjetil S
    University of Oslo.
    Jensen, Jimmy
    Kristianstad University, School of Education and Environment, Avdelningen för Humanvetenskap. University of Oslo.
    Andreassen, Ole A
    University of Oslo.
    Melle, Ingrid
    University of Oslo.
    Ueland, Torill
    University of Oslo.
    Stability of executive functions in first episode psychosis: one year follow up study2015In: Psychiatry Research, ISSN 0165-1781, E-ISSN 1872-7123, Vol. 228, no 3, p. 475-481Article in journal (Refereed)
    Abstract [en]

    Executive functioning is a multi-dimensional construct covering several sub-processes. The aim of this study was to determine whether executive functions, indexed by a broad range of executive measures remain stable in first episode psychosis (FEP) over time. Eighty-two patients and 107 age and gender matched healthy controls were assessed on five subdomains of executive functioning; working memory, fluency, flexibility, and inhibitory control at baseline and at 1 year follow-up. Results showed that patients performed significantly poorer than controls on all executive measures at both assessment points. In general executive functions remained stable from baseline to follow-up, although both groups improved on measures of inhibitory control and flexibility. In phonemic fluency, controls showed a slight improvement while patients showed a slight decline. Investigation of individual trajectories revealed some fluctuations in both groups over time, but mainly supports the group level findings. The implications of these results are discussed.

  • 4. Thormodsen, Rune
    et al.
    Jensen, Jimmy
    Oslo University Hospital & University of Oslo, Norway & Charité Universitätsmedizin, Berlin, Germany.
    Holmèn, Aina
    Juuhl-Langseth, Monica
    Emblem, Kyrre Eeg
    Andreassen, Ole Andreas
    Rund, Bjørn Rishovd
    Prefrontal hyperactivation during a working memory task in early-onset schizophrenia spectrum disorders: an fMRI study.2011In: Psychiatry Research, ISSN 0165-1781, E-ISSN 1872-7123, Vol. 194, no 3, p. 257-262Article in journal (Refereed)
    Abstract [en]

    Working memory (WM) dysfunction is increasingly recognized as a core feature of schizophrenia, but few studies have investigated prefrontal activation during WM tasks in early-onset schizophrenia spectrum disorder (EOS). Our aim was to explore prefrontal activation during a WM-task in EOS patients compared to healthy controls using functional magnetic resonance imaging (fMRI). Fifteen patients with EOS and 15 matched healthy controls performed a 0-back and a 2-back task while fMRI data were acquired. Results indicated that even though performance between patients and controls was comparable on both tasks, there was a hyperactivation in patients' ventrolateral prefrontal cortex (VLPFC) during the 2-back task compared to healthy controls. This pattern of activation suggests that, in patients with EOS, the VLPFC compensated in order to match performance of the controls. The activations in the EOS group may reflect the use of a compensatory, cognitive strategy while solving WM-tasks.

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