Blar i Vitenskapelige publikasjoner (HV) på forfatter "Johannessen, Jan Olav"

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    • Associations between symptom and neurocognitive dimensions in clinical high risk for psychosis 

      Aase, Ingvild; Langeveld, Johannes Hendrik; Joa, Inge; Johannessen, Jan Olav; Dalen, Ingvild; Hegelstad, Wenche (Peer reviewed; Journal article, 2022)
      Introduction Clinical high risk for psychosis (CHR) is associated with mild cognitive impairments. Symptoms are clustered into positive, negative and disorganization symptoms. The association between specific symptom ...

    • Childhood trauma, antipsychotic medication, and symptom remission in first-episode psychosis 

      Ottesen, Akiah; Hegelstad, Wenche; Joa, Inge; Ilner, Stein E. Opjordsmoen; Rund, Bjørn Rishovd; Røssberg, Jan Ivar; Simonsen, Erik; Johannessen, Jan Olav; Larsen, Tor Ketil; Haahr, Ulrik H.; McGlashan, T.H.; Friis, Svein; Melle, Ingrid (Peer reviewed; Journal article, 2021-11)
      Background To what extent psychotic symptoms in first-episode psychosis (FEP) with a history of childhood interpersonal trauma (CIT) are less responsive to antipsychotic medication is not known. In this longitudinal study, ...

    • Cognitive predictors of longitudinal positive symptom course in clinical high risk for psychosis 

      Aase, Ingvild; Langeveld, Johannes Hendrik; Johannessen, Jan Olav; Joa, Inge; Dalen, Ingvild; Hegelstad, Wenche (Peer reviewed; Journal article, 2021)
      Background Clinical High Risk (CHS) for psychosis is a state in which positive symptoms are predominant but do not reach a level of severity that fulfils the criteria for a psychotic episode. The aim of this study has ...

    • Early substance use cessation improves cognition-10 years outcome in first-episode psychosis patients 

      Weibell, Melissa Anne E; Johannessen, Jan Olav; Auestad, Bjørn Henrik; Bramness, Jørgen Gustav; Brønnick, Kolbjørn Kallesten; Haahr, Ulrik; Joa, Inge; Larsen, Tor Ketil; Melle, Ingrid; Ilner, Stein E. Opjordsmoen; Rund, Bjørn Rishovd; Røssberg, Jan Ivar; Simonsen, Erik; Vaglum, Per; Stain, Helen J.; Friis, Svein; Hegelstad, Wenche (Journal article; Peer reviewed, 2019-07)
      Background: Cognitive impairment may be a risk factor for, as well as a consequence of, psychosis. Non-remitting symptoms, premorbid functioning, level of education, and socioeconomic background are known correlates. A ...

    • Early substance use cessation improves cognition-10 years outcome in first-episode psychosis patients 

      Johannessen, Jan Olav; Auestad, Bjørn Henrik; Bramness, Jørgen Gustav; Brønnick, Kolbjørn Kallesten; Haahr, Ulrik; Joa, Inge; Larsen, Tor Ketil; Melle, Ingrid; Ilner, Stein E. Opjordsmoen; Rund, Bjørn Rishovd; Røssberg, Jan Ivar; Simonsen, Erik; Vaglum, Per; Stain, Helen J.; Friis, Svein; Hegelstad, Wenche (Journal article; Peer reviewed, 2019-07)
      Background: Cognitive impairment may be a risk factor for, as well as a consequence of, psychosis. Non-remitting symptoms, premorbid functioning, level of education, and socioeconomic background are known correlates. A ...

    • The Effect of Intensive Implementation Support on Fidelity for Four Evidence‑Based Psychosis Treatments: A Cluster Randomized Trial 

      Ruud, Torleif; Drake, Robert E.; Saltyte Benth, Jurate; Drivenes, Karin; Hartveit, Miriam; Heiervang, Kristin Sverdvik; Høifødt, Tordis Sørensen; Haaland, Vegard Øksendal; Joa, Inge; Johannessen, Jan Olav; Johansen, Karl Johan; Stensrud, Bjørn; Haugom, Espen Woldsengen; Clausen, Hanne Kristin; Biringer, Eva Aaker; Bond, Gary R. (Peer reviewed; Journal article, 2021)
      Abstract Purpose: Service providers need effective strategies to implement evidence-based practices (EBPs) with high fidelity. This study aimed to evaluate an intensive implementation support strategy to increase fidelity ...

    • An exploratory study of the experiences of being both a mental health professional and carer in mental health services in Norway 

      Stain, Helen J.; Johannessen, Jan Olav; Joa, Inge (Peer reviewed; Journal article, 2020-01)
      4.1 Introduction Around 60% of carers of relatives with mental health problems report feeling unrecognized by professional health care, and many report a lack of engagement, shared decision‐making and information sharing. ...

    • Exploring specific predictors of psychosis onset over a 2‐year period: A decision‐tree model 

      Bjørnestad, Jone Ravndal; Tjora, Tore; Langeveld, Johannes Hendrik; Stain, Helen J.; Joa, Inge; Johannessen, Jan Olav; Friedman‐Yakoobian, Michelle; Hegelstad, Wenche ten Velden (Peer reviewed; Journal article, 2021-05)
      Aim The fluctuating symptoms of clinical high risk for psychosis hamper conversion prediction models. Exploring specific symptoms using machine-learning has proven fruitful in accommodating this challenge. The aim of this ...

    • The Family Psychoeducation Fidelity Scale: Psychometric Properties 

      Joa, Inge; Johannessen, Jan Olav; Heiervang, Kristin S.; Sviland, A. A.; Nordin, Håkan; Landers, Matthew; Ruud, Torleif; Drake, Robert E.; Bond, Gary R. (Peer reviewed; Journal article, 2020)
      This study examined psychometric properties and feasibility of the Family Psychoeducation (FPE) Fidelity Scale. Fidelity assessors conducted reviews using the FPE fidelity scale four times over 18 months at five sites in ...

    • One-year outcome and adherence to pharmacological guidelines in first-episode schizophrenia: Results from a consecutive cohort study 

      Drosos, Petros; Brønnick, Kolbjørn Kallesten; Joa, Inge; Johannessen, Jan Olav; Johnsen, Erik; Kroken, Rune Andreas; Stain, Helen J.; Hegelstad, Wenche; Larsen, Tor Ketil (Peer reviewed; Journal article, 2020)
      Background Remission in schizophrenia is difficult to achieve. Antipsychotic drugs are critical in the treatment of schizophrenia. International guidelines for the pharmacological treatment of schizophrenia recommend a ...

    • Parents' perspectives on user participation and shared decision‐making in adolescents' inpatient mental healthcare 

      Bjønness, Stig Erlend; Grønnestad, Trond Erik; Johannessen, Jan Olav; Storm, Marianne (Peer reviewed; Journal article, 2022)
      Background Parents are a resource that can be of considerable importance in supporting their adolescents' recovery and shared decision-making processes. However, involving both adolescents and their parents in treatment ...

    • Psychiatric patients’ attitudes towards being hospitalized: a national multicentre study in Norway 

      Hustoft, Kjetil; Larsen, Tor Ketil; Brønnick, Kolbjørn Kallesten; Joa, Inge; Johannessen, Jan Olav; Ruud, Torleif (Peer reviewed; Journal article, 2022)
      Background The aim of the study was to explore patients’ attitudes towards voluntary and involuntary hospitalization in Norway, and predictors for involuntary patients who wanted admission. Methods A multi-centre study ...

    • Psychotherapy in psychosis: Experiences of fully recovered service users 

      Bjørnestad, Jone Ravndal; Veseth, Marius; Davidson, Larry; Joa, Inge; Johannessen, Jan Olav; Larsen, Tor Ketil; Melle, Ingrid; Hegelstad, Wenche (Journal article; Peer reviewed, 2018-09)
      Background: Despite the evidence of the importance of including service users’ views on psychotherapy after psychosis, there is a paucity of research investigating impact on full recovery. Objectives: To explore what ...

    • Reduced Expression of Emotion: A Red Flag Signalling Conversion to Psychosis in Clinical High Risk for Psychosis (CHR-P) Populations 

      Bjørnestad, Jone Ravndal; Tjora, Tore; Langeveld, Johannes Hendrik; Joa, Inge; Johannessen, Jan Olav; Friedman‐Yakoobian, Michelle; Hegelstad, Wenche (Peer reviewed; Journal article, 2022-02)
      Objective: In this hypothesis-testing study, which is based on findings from a previous atheoretical machine-learning study, we test the predictive power of baseline “reduced expression of emotion” for psychosis. Method: ...

    • Social media and social functioning in psychosis: A systematic review 

      Bjørnestad, Jone Ravndal; Hegelstad, Wenche; Berg, Henrik; Davidson, Larry; Joa, Inge; Johannessen, Jan Olav; Melle, Ingrid; Stain, Helen J.; Pallesen, Ståle (Journal article; Peer reviewed, 2019-06)
      Background: Individuals with psychosis are heavy consumers of social media. It is unknown to what degree measures of social functioning include measures of online social activity. Objective: To examine the inclusion of ...

    • User participation and shared decision-making in adolescent mental healthcare: a qualitative study of healthcare professionals' perspectives 

      Bjønness, Stig Erlend; Viksveen, Petter; Johannessen, Jan Olav; Storm, Marianne (Journal article; Peer reviewed, 2020-01)
      Background Most mental health problems occur in adolescence. There is increasing recognition of user participation and shared decision-making in adolescents’ mental healthcare. However, research in this field of clinical ...

    • “We all have a responsibility”: a narrative discourse analysis of an information campaign targeting help-seeking in first episode psychosis 

      Hansen, Hege; Stige, Signe Hjelen; Moltu, Christian; Johannessen, Jan Olav; Joa, Inge; Dybvig, Sveinung; Veseth, Marius (Journal article; Peer reviewed, 2019-05)
      Background: Intervening at an early stage of psychosis improves the chances of recovery from first-episode psychosis. However, people who are experiencing distress and early psychotic symptoms generally seem to delay seeking ...