Vitenskapelig artikkel

• Farivar Fathian; Ivana Divcovic; Maria Fagerbakke Strømme et al. (2025). Natural-cause mortality and C-reactive protein levels in patients with schizophrenia spectrum disorders: A prospective total cohort study. (ekstern lenke)
• Gunnhild Eldhuset Hoprekstad; Erik Johnsen; Christoffer Bartz-Johannessen et al. (2025). Prednisolone add-on in early phase schizophrenia: A randomized, double-blind, placebo-controlled pilot study. (ekstern lenke)
• Lena Antonsen Stabell; Erik Johnsen; Rune Andreas Kroken et al. (2026). Levels of and changes in psychosis symptoms and clinical insight: Exploring the impact of differential antipsychotic mechanisms. (ekstern lenke)
• Erik Johnsen; Hugo Arild Jørgensen; Gard Frodahl Svingen (2004). Practice regarding antipsychotic therapy: A cross-sectional survey in two Norwegian hospitals. (ekstern lenke)
• Narvini Rajen; Hanne Wrengler Velure; Erik Johnsen et al. (2025). Impaired folate status in patients with mental disorders. (ekstern lenke)
• Søren Beck Jensen; Mashhood Ahmed Sheikh; Ibrahim Ahmed Akkouh et al. (2022). Elevated Systemic Levels of Markers Reflecting Intestinal Barrier Dysfunction and Inflammasome Activation Are Correlated in Severe Mental Illness. (ekstern lenke)
• Beate Hatlelid Bø; Øyvind Heen Ottesen; Rolf Gjestad et al. (2016). Patient satisfaction after acute admission for psychosis. (ekstern lenke)
• Liv Eggset Falkenberg; René Westerhausen; Erik Johnsen et al. (2020). Hallucinating schizophrenia patients have longer left arcuate fasciculus fiber tracks: a DTI tractography study. (ekstern lenke)
• Farivar Fathian; Else-Marie Løberg; Rolf Gjestad et al. (2018). Associations between C-reactive protein levels and cognition during the first 6 months after acute psychosis. (ekstern lenke)
• Liss Gøril Anda-Ågotnes; Kolbjørn Selvåg Brønnick; Erik Johnsen et al. (2016). The course of neurocognitive changes in acute psychosis: Relation to symptomatic improvement. (ekstern lenke)
• Alexander R. Craven; Gerard Eric Dwyer; Lars Ersland et al. (2023). GABA, glutamatergic dynamics and BOLD contrast assessed concurrently using functional MRS during a cognitive task. (ekstern lenke)
• Eirik Kjelby; Rolf Gjestad; Farivar Fathian et al. (2023). Antidepressive Effectiveness of Amisulpride, Aripiprazole, and Olanzapine in Patients with Schizophrenia Spectrum Disorders: A Secondary Outcome Analysis of a Pragmatic, Randomized Trial (BeSt InTro). (ekstern lenke)
• Eirik Kjelby; Igne Sinkeviciute; Rolf Gjestad et al. (2015). Suicidality in schizophrenia spectrum disorders: The relationship to hallucinations and persecutory delusions. (ekstern lenke)
• Maria Fagerbakke Strømme; Liv Solrunn Mellesdal; Christoffer Bartz-Johannessen et al. (2022). Use of Benzodiazepines and Antipsychotic Drugs Are Inversely Associated with Acute Readmission Risk in Schizophrenia. (ekstern lenke)
• John Engh; Thor Ueland; Ingrid Agartz et al. (2021). Plasma Levels of the Cytokines B Cell-Activating Factor (BAFF) and A Proliferation-Inducing Ligand (APRIL) in Schizophrenia, Bipolar, and Major Depressive Disorder: A Cross Sectional, Multisite Study. (ekstern lenke)
• Kristiina Kompus; Liv Eggset Falkenberg; Josef J Bless et al. (2013). The role of the primary auditory cortex in the neural mechanism of auditory verbal hallucinations. (ekstern lenke)
• Lyliana G. Nasib; Iris Else Clara Sommer; Inge Winter - Van Rossum et al. (2020). Prednisolone versus placebo addition in the treatment of patients with recent-onset psychotic disorder: A trial design. (ekstern lenke)
• Rune Kroken; Liv Mellesdal; Tore Wentzel-Larsen et al. (2012). Time-dependent effect analysis of antipsychotic treatment in a naturalistic cohort study of patients with schizophrenia. (ekstern lenke)
• Sarah Weber; Helene Hjelmervik; Alexander Richard Craig-Craven et al. (2021). Glutamate- and GABA-Modulated Connectivity in Auditory Hallucinations—A Combined Resting State fMRI and MR Spectroscopy Study. (ekstern lenke)
• Liss Gøril Anda-Ågotnes; Kolbjørn Kallesten Brønnick; Jan Olav Johannessen et al. (2019). Cognitive profile in ultra high risk for psychosis and schizophrenia: A comparison using coordinated norms. (ekstern lenke)
• Petros Drosos; Kolbjørn Kallesten Brønnick; Inge Joa et al. (2020). One-year outcome and adherence to pharmacological guidelines in first-episode schizophrenia: Results from a consecutive cohort study. (ekstern lenke)
• Jill Kristin Bjarke; Helga Nødland Gjerde; Hugo A Jørgensen et al. (2022). Akathisia and atypical antipsychotics. Relation to suicidality, agitation and depression in a clinical trial. (ekstern lenke)
• Siri Helle; Rolf Gjestad; Erik Johnsen et al. (2014). Cognitive changes in patients with acute phase psychosis - Effects of illicit drug use. (ekstern lenke)
• Justyna Beresniewicz; Alexander R. Craven; Kenneth Hugdahl et al. (2021). White matter microstructural differences between hallucinating and non-hallucinating schizophrenia spectrum patients. (ekstern lenke)
• Erik Johnsen; Rune Andreas Kroken; Else-Marie Løberg et al. (2020). Amisulpride, aripiprazole, and olanzapine in patients with schizophrenia-spectrum disorders (BeSt InTro): a pragmatic, rater-blind, semi-randomised trial. (ekstern lenke)
• Eirik Kjelby; Hugo A Jørgensen; Rune Kroken et al. (2011). Anti-depressive effectiveness of olanzapine, quetiapine, risperidone and ziprasidone: a pragmatic, randomized trial. (ekstern lenke)
• Jill Kristin Bjarke; Igne Sinkeviciute; Rune Andreas Kroken et al. (2020). Different response patterns in hallucinations and delusions to antipsychotic treatment. (ekstern lenke)
• Roy Edgar Olsen; Rune Andreas Kroken; Sigmund Bjørhovde et al. (2016). Influence of different second generation antipsychotics on the QTC interval: A pragmatic study. (ekstern lenke)
• Nina Mørkved; Erik Johnsen; Rune Andreas Kroken et al. (2024). Childhood trauma types in relation to antipsychotic effectiveness in schizophrenia spectrum disorders: A prospective, pragmatic, randomized controlled study. (ekstern lenke)
• Merethe Nygård; Else-Marie Løberg; Alexander Richard Craig-Craven et al. (2013). Dichotic listening, executive functions and grey matter cortical volume in patients with schizophrenia and healthy controls. (ekstern lenke)
• Silje Skrede; Jon Andsnes Berg; KJELL OVE FOSSAN et al. (2021). Illicit substances detected through high-resolution MS analysis in urine samples are associated with greater symptom burden in patients with psychosis. (ekstern lenke)
• Erik Johnsen; Rune Kroken; Tore Wentzel-Larsen et al. (2010). Effectiveness of second-generation antipsychotics: a naturalistic, randomized comparison of olanzapine, quetiapine, risperidone, and ziprasidone. (ekstern lenke)
• Isabella Kusztrits; Frank Larøi; Julien Freddy Laloyaux et al. (2020). Mapping psychotic-like experiences: Results from an online survey. (ekstern lenke)
• Igne Sinkeviciute; Kenneth Jan Hugdahl; Christoffer Bartz-Johannessen et al. (2021). Differential Effectiveness of Atypical Antipsychotics on Hallucinations: A Pragmatic Randomized Controlled Trial. (ekstern lenke)
• Kenneth Hugdahl; Merethe Nygård; Liv Eggset Falkenberg et al. (2014). Failure of attention focus and cognitive control in schizophrenia patients with auditory verbal hallucinations: Evidence from dichotic listening. (ekstern lenke)
• Liss Anda; Erik Johnsen; Rune A. Kroken et al. (2021). Cognitive change and antipsychotic medications: Results from a pragmatic rater-blind RCT. (ekstern lenke)
• Maria Fagerbakke Strømme; Christoffer Bartz-Johannessen; Rune Andreas Kroken et al. (2022). Overactive, aggressive, disruptive and agitated behavior associated with the use of psychotropic medications in schizophrenia. (ekstern lenke)
• Kristin Fjelnseth Wold; Akiah Ottesen; Camilla Bärthel Flaaten et al. (2023). Early identification of treatment non-response in first-episode psychosis. (ekstern lenke)
• Liv Solrunn Mellesdal; Rolf Gjestad; Erik Johnsen et al. (2015). Borderline personality disorder and posttraumatic stress disorder at psychiatric discharge predict general hospital admission for self-harm. (ekstern lenke)
• Rune andreas Kroken; Eirik Kjelby; Tore Wentzel-Larsen et al. (2014). Time to discontinuation of antipsychotic drugs in a schizophrenia cohort: influence of current treatment strategies. (ekstern lenke)
• Mikkel Højlund; Anton Pottegård; Erik Johnsen et al. (2019). Trends in utilization and dosing of antipsychotic drugs in Scandinavia: Comparison of 2006 and 2016. (ekstern lenke)
• Liv Eggset Falkenberg; René Westerhausen; Alexander Richard Craig-Craven et al. (2014). Impact of glutamate levels on neuronal response and cognitive abilities in schizophrenia. (ekstern lenke)
• Else-Marie Løberg; Hugo A Jørgensen; Rune Kroken et al. (2015). Auditory verbal hallucinations reflect stable auditory attention deficits: A prospective study. (ekstern lenke)
• Mashhood Ahmed Sheikh; Kevin Sean O'Connell; Tove Lekva et al. (2022). Systemic cell adhesion molecules in severe mental illness: Potential role of intercellular CAM-1 in linking peripheral and neuroinflammation. (ekstern lenke)
• Nina Mørkved; Erik Johnsen; Rune Andreas Kroken et al. (2022). Impact of childhood trauma on antipsychotic effectiveness in schizophrenia spectrum disorders: A prospective, pragmatic, semi-randomized trial. (ekstern lenke)
• Helene Hjelmervik; Alexander Richard Craig-Craven; Erik Johnsen et al. (2021). Negative valence of hallucinatory voices as predictor of cortical glutamatergic metabolite levels in schizophrenia patients. (ekstern lenke)
• Eirik Kjelby; Rolf Gjestad; Igne Sinkeviciute et al. (2018). Trajectories of depressive symptoms in the acute phase of psychosis: Implications for treatment. (ekstern lenke)
• Lena Antonsen Stabell; Erik Johnsen; Rune Andreas Kroken et al. (2023). Clinical insight among persons with schizophrenia spectrum disorders treated with amisulpride, aripiprazole or olanzapine: a semi-randomised trial. (ekstern lenke)
• Maria Fagerbakke Strømme; Liv Solrunn Mellesdal; Christoffer Bartz-Johannessen et al. (2021). Mortality and non-use of antipsychotic drugs after acute admission in schizophrenia: A prospective total-cohort study. (ekstern lenke)
• Alexander R. Craven; Gerard Eric Dwyer; Lars Ersland et al. (2025). GABA, glutamate dynamics and BOLD observed during cognitive processing in psychosis patients with hallucinatory traits. (ekstern lenke)
• Else-Marie Løberg; Merethe Nygård; Jan Øystein Berle et al. (2012). An fMRI study of neuronal activation in schizophrenia patients with and without previous cannabis use. (ekstern lenke)
• Jeanette Brun Larsen; Solveig Merete Klæbo Reitan; Else-Marie Løberg et al. (2021). The association between cytokines and psychomotor speed in a spectrum of psychotic disorders: A longitudinal study. (ekstern lenke)
• Dimitrios Andreou; Nils Eiel Steen; Kjetil Nordbø Jørgensen et al. (2021). Lower circulating neuron-specific enolase concentrations in adults and adolescents with severe mental illness. (ekstern lenke)
• Erik Johnsen; Rune Kroken; Else-Marie Løberg et al. (2011). Sexual dysfunction and hyperprolactinemia in male psychotic in-patients: a cross-sectional study. (ekstern lenke)
• Ieva Leskauskaite; Anja Torsvik; Christoffer Bartz-Johannessen et al. (2025). Sex differences in the peripheral levels of cytokines during 12-month antipsychotic treatment in a drug-naïve schizophrenia spectrum cohort. (ekstern lenke)
• Lynn Anne Marquardt; Alexander R. Craven; Kenneth Jan Hugdahl et al. (2022). Pilot-RCT Finds No Evidence for Modulation of Neuronal Networks of Auditory Hallucinations by Transcranial Direct Current Stimulation. (ekstern lenke)
• Nina Mørkved; Pia Sophie Bryntesen; Ida Marie Eggen et al. (2025). The relationship between childhood maltreatment and trauma and psychosis is not moderated by parental mental health. (ekstern lenke)
• Elisabeth Haug Lund-Stenvold; Petter Andreas Ringen; Ole Andreassen et al. (2025). Implementation of the healthy heart tool- an algorithm with potential cardiometabolic health benefits in persons with severe mental illness. (ekstern lenke)
• Lydia Brunvoll Sandøy; Katarzyna Kazimierczak; Frank Riemer et al. (2025). Voxel-based versus network-analysis of changes in brain states in patients with auditory verbal hallucinations using the Eriksen Flanker task. (ekstern lenke)
• Renata Alisauskiene; Else-Marie Løberg; Rolf Gjestad et al. (2019). The influence of substance use on the effectiveness of antipsychotic medication: a prospective, pragmatic study. (ekstern lenke)
• Helene Hjelmervik; Alexander Richard Craig-Craven; Igne Sinkeviciute et al. (2019). Intra-Regional Glu-GABA vs Inter-Regional Glu-Glu Imbalance: A 1H-MRS Study of the Neurochemistry of Auditory Verbal Hallucinations in Schizophrenia.. (ekstern lenke)
• Gunnhild Eldhuset Hoprekstad; Silje Skrede; Christoffer Bartz-Johannessen et al. (2024). Association between cytokines and suicidality in patients with psychosis: A multicentre longitudinal analysis. (ekstern lenke)
• Erik Johnsen; Ole Bernt Fasmer; Heidi Karin van Wageningen et al. (2013). The influence of glutamatergic antagonism on motor variability, and comparison to findings in schizophrenia patients. (ekstern lenke)
• Attila Szabo; Kevin Sean O'Connell; Thor Ueland et al. (2021). Increased circulating IL-18 levels in severe mental disorders indicate systemic inflammasome activation. (ekstern lenke)
• Nina Mørkved; Erik Johnsen; Rune Andreas Kroken et al. (2020). Does childhood trauma influence cognitive functioning in schizophrenia? The association of childhood trauma and cognition in schizophrenia spectrum disorders.. (ekstern lenke)
• Erik Johnsen; Hugo A Jørgensen; Rune Kroken et al. (2013). Neurocognitive effectiveness of quetiapine, olanzapine, risperidone, and ziprasidone: A pragmatic, randomized trial. (ekstern lenke)
• Kenneth Hugdahl; Alexander Richard Craig-Craven; Merethe Nygård et al. (2015). Glutamate as a mediating transmitter for auditory hallucinations in schizophrenia: A 1H MRS study.. (ekstern lenke)
• Magda L. Dumitru; Erik Johnsen; Rune Andreas Kroken et al. (2024). Widespread asymmetries of amygdala nuclei predict auditory verbal hallucinations in schizophrenia. (ekstern lenke)
• Renata Alisauskiene; Erik Johnsen; Rolf Gjestad et al. (2021). The Influence of Substance Use on Side Effects of Olanzapine, Quetiapine, Risperidone, and Ziprasidone in Psychosis. (ekstern lenke)
• Sanne Hoekstra; Christoffer Bartz-Johannessen; Igne Sinkeviciute et al. (2021). Sex differences in antipsychotic efficacy and side effects in schizophrenia spectrum disorder: results from the BeSt InTro study. (ekstern lenke)
• Siren Tønnesen; Tobias Kaufmann; Ann-Marie Glasø de Lange et al. (2020). Brain age prediction reveals aberrant brain white matter in schizophrenia and bipolar disorder: A multisample diffusion tensor imaging study. (ekstern lenke)
• Erik Johnsen; Kristina Aanesen; Sanjeevan Sriskandarajah et al. (2013). QTc prolongation in patients acutely admitted to hospital for psychosis and treated with second generation antipsychotics. (ekstern lenke)
• Kristian Varden Gjerde; Christoffer Bartz-Johannessen; Vidar Martin Steen et al. (2024). Cellular adhesion molecules in drug-naïve and previously medicated patients with schizophrenia-spectrum disorders. (ekstern lenke)
• Igne Sinkeviciute; Rune A. Kroken; Erik Johnsen (2012). Priapism in antipsychotic drug use: a rare but important side effect. (ekstern lenke)
• Merethe Nygård; Tom Eichele; Else-Marie Løberg et al. (2012). Patients with schizophrenia fail to up-regulate task-positive and down-regulate task-negative brain networks: An fMRI study using an ICA analysis approach. (ekstern lenke)
• Clara Strauss; Kenneth Hugdahl; Flavie Waters et al. (2017). The Beliefs about Voices Questionnaire - Revised: A factor structure from 450 participants. (ekstern lenke)
• Nina Mørkved; Mathilde Paulina Endsjø; Dagfinn Winje et al. (2016). Childhood trauma in schizophrenia spectrum disorder as compared to other mental health disorders. (ekstern lenke)
• Petter Andreas Ringen; Elisabeth Haug Lund-Stenvold; Ole Andreassen et al. (2022). Quality of clinical management of cardiometabolic risk factors in patients with severe mental illness in a specialist mental health care setting. (ekstern lenke)
• Erik Johnsen; Hugo A Jørgensen; Rune Kroken et al. (2011). Neurocognitive effectiveness of quetiapine, olanzapine, risperidone, and ziprasidone: a pragmatic, randomized trial. (ekstern lenke)
• Farivar Fathian; Rolf Gjestad; Rune Andreas Kroken et al. (2022). Association between C-reactive protein levels and antipsychotic treatment during 12 months follow-up period after acute psychosis. (ekstern lenke)
• Kristian Varden Gjerde; Christoffer Bartz-Johannessen; Else-Marie Løberg et al. (2026). Neural and vascular cellular adhesion molecules are associated with cognitive function in patients with schizophrenia-spectrum disorders: A longitudinal study. (ekstern lenke)
• Maria Fagerbakke Strømme; Christoffer Bartz-Johannessen; Eirik Kjelby et al. (2024). Risk factors for mortality in patients admitted to a psychiatric acute ward: A prospective cohort study. (ekstern lenke)
• Else-Marie Løberg; Hugo A Jørgensen; Rune Andreas Kroken et al. (2014). Do auditory verbal hallucinations in the acute phase of psychosis reflect stable cognitive impairments seen also in a more stabilised clinical phase?. (ekstern lenke)
• Rune Andreas Kroken; Lena Antonsen Stabell; Harleen Grewal et al. (2023). Seroprevalence of SARS-CoV-2 antibodies in a prospective cohort of patients admitted to an acute psychiatric ward in Norway during the initial months of the COVID-19 pandemic. (ekstern lenke)
• Lena Antonsen Stabell; Rolf Gjestad; Rune Andreas Kroken et al. (2019). Predictors of treatment satisfaction in antipsychotic-naive and previously medicated patients with acute-phase psychosis. (ekstern lenke)
• Torhild Smith Wiker; Rolf Gjestad; Liv Solrunn Mellesdal et al. (2019). Supported accommodation for people with schizophrenia. (ekstern lenke)
• Renata Alisauskiene; Erik Johnsen; Rolf Gjestad et al. (2023). Does drug use affect the efficacy of amisulpride, aripiprazole and olanzapine in patients with schizophrenia spectrum disorders? Results from a pragmatic, randomised study. (ekstern lenke)
• Petros Drosos; Erik Johnsen; Christoffer Bartz-Johannessen et al. (2022). Trajectories of response in schizophrenia-spectrum disorders: A one-year prospective cohort study of antipsychotic effectiveness. (ekstern lenke)
• Siri Helle; Petter Andreas Ringen; Ingrid Melle et al. (2016). Cannabis use is associated with 3 years earlier onset of schizophrenia spectrum disorder in a naturalistic, multi-site sample (N = 1119). (ekstern lenke)
• Erik Johnsen; Hugo Arild Jørgensen (2006). Antipsykotikaindusert hyperprolaktinemi. (ekstern lenke)
• Kenneth Hugdahl; Alexander R. Craven; Erik Johnsen et al. (2022). Neural Activation in the Ventromedial Prefrontal Cortex Precedes Conscious Experience of Being in or out of a Transient Hallucinatory State. (ekstern lenke)
• Hallvard Teigen Lund-Heimark; Eirik Kjelby; Lars Mehlum et al. (2020). Elderly Patients With No Previous Psychiatric History: Suicidality and Other Factors Relating to Psychiatric Acute Admissions. (ekstern lenke)
• Petros Drosos; Erik Johnsen; Christoffer Bartz-Johannessen et al. (2024). Remission in schizophrenia spectrum disorders: A randomized trial of amisulpride, aripiprazole and olanzapine. (ekstern lenke)
• Rune A. Kroken; Erik Johnsen; Torleif Ruud et al. (2009). Treatment of schizophrenia with antipsychotics in Norwegian emergency wards, a cross-sectional national study. (ekstern lenke)
• Erik Johnsen; Igne Sinkevicute; Else-Marie Løberg et al. (2013). Hallucinations in acutely admitted patients with psychosis, and effectiveness of risperidone, olanzapine, quetiapine, and ziprasidone: a pragmatic, randomized study. (ekstern lenke)
• Erik Johnsen; Rune A. Kroken; Mirsad Abaza et al. (2008). Antipsychotic-induced hyperprolactinemia: A cross-sectional survey. (ekstern lenke)
• Daniil Butenko; Miles Rinaldi; Beate Brinchmann et al. (2022). Turnover of IPS employment specialists: Rates and predictors. (ekstern lenke)
• Igne Sinkeviciute; Marieke Begemann; Merel Prikken et al. (2018). Efficacy of different types of cognitive enhancers for patients with schizophrenia: a meta-analysis. (ekstern lenke)
• Maria Fagerbakke Strømme; Mina Thue Augustsson; Christoffer Bartz-Johannessen et al. (2024). Suicidality and use of psychotropic medications in patients with schizophrenia: A prospective cohort study. (ekstern lenke)
• Nina Mørkved; Dagfinn Winje; Anders Dovran et al. (2018). Childhood trauma in schizophrenia spectrum disorders as compared to substance abuse disorders. (ekstern lenke)
• Kenneth Hugdahl; Else-Marie Løberg; Liv Eggset Falkenberg et al. (2012). Auditory verbal hallucinations in schizophrenia as aberrant lateralized speech perception: Evidence from dichotic listening. (ekstern lenke)
• Kristin Fjelnseth Wold; Isabel Kreis; Gina Åsbø et al. (2024). Long-term clinical recovery and treatment resistance in first-episode psychosis: a 10-year follow-up study. (ekstern lenke)
• Erik Johnsen; Farivar Fathian; Rune Andreas Kroken et al. (2016). The serum level of C-reactive protein (CRP) is associated with cognitive performance in acute phase psychosis. (ekstern lenke)
• Sarah Weber; Erik Johnsen; Rune Andreas Kroken et al. (2020). Dynamic functional connectivity patterns in schizophrenia and the relationship with hallucinations. (ekstern lenke)
• Erik Johnsen; Rolf Gjestad; Rune Kroken et al. (2011). Cardiovascular risk in patients admitted for psychosis compared with findings from a population-based study. (ekstern lenke)
• Gunnhild Eldhuset Hoprekstad; Eirik Kjelby; Rolf Gjestad et al. (2023). Depression trajectories and cytokines in schizophrenia spectrum disorders - A longitudinal observational study. (ekstern lenke)

Vitenskapelig litteraturgjennomgang

• Erik Johnsen; Rune Kroken (2012). Drug treatment developments in schizophrenia and bipolar mania: latest evidence and clinical usefulness. (ekstern lenke)
• Rune Kroken; Erik Johnsen (2012). Is rational antipsychotic polytherapy feasible? A selective review. (ekstern lenke)
• Gunter Schumann; Elisabeth B. Binder; Arne Holte et al. (2014). Stratified medicine for mental disorders. (ekstern lenke)
• Rune Andreas Kroken; Iris Else Clara Sommer; Vidar Martin Steen et al. (2019). Constructing the immune signature of schizophrenia for clinical use and research; an integrative review translating descriptives into diagnostics. (ekstern lenke)
• Gerard Eric Dwyer; Erik Johnsen; Kenneth Jan Hugdahl (2024). NMDAR dysfunction and the regulation of dopaminergic transmission in schizophrenia. (ekstern lenke)
• Malene Kalsnes Tyssedal; Erik Johnsen; Aurora Margrethe Brønstad et al. (2023). Dog-assisted interventions for adults diagnosed with schizophrenia and related disorders: a systematic review. (ekstern lenke)
• Erik Johnsen; Hugo Arild Jørgensen (2008). Effectiveness of second generation antipsychotics: A systematic review of randomized trials. (ekstern lenke)
• Erik Johnsen (2009). Review: second generation antipsychotics are a heterogeneous drug class. (ekstern lenke)
• Rune Kroken; Else-Marie Løberg; Tore Drønen et al. (2014). A critical review of pro-cognitive drug targets in psychosis: convergence on myelination and inflammation. (ekstern lenke)
• Erik Johnsen; Kenneth Hugdahl; Paolo Fusar-Poli et al. (2013). Neuropsychopharmacology of auditory hallucinations: Insights from pharmacological MRI and perspectives for future research. (ekstern lenke)
• Else-Marie Løberg; Siri Helle; Merethe Nygård et al. (2014). The cannabis pathway to non-affective psychosis may reflect less neurobiological vulnerability. (ekstern lenke)
• Erik Johnsen (2012). Review: metabolic side effects of second-generation antipsychotics. (ekstern lenke)

Doktorgradsavhandling

• Priyanthi Borgen Gjerde; Vidar Martin Steen; Ingrid Melle et al. (2020). Lipid effects during antipsychotic drug treatment and their relevance for clinical outcomes. (ekstern lenke)
• Farivar Fathian; Erik Johnsen (2019). C- reactive protein in schizophrenia-spectrum disorders; relationship to cognitive functions and medications. (ekstern lenke)
• Erik Johnsen (2010). Second generation antipsychotics in a naturalistic setting: effects and side effects. (ekstern lenke)

Fagbok

• Tor Busch; Erik Johnsen; Kurt Klaudi Klausen et al. (2001). Modernisering av offentlig sektor : new public management i praksis. (ekstern lenke)
• Tor Busch; Erik Johnsen; Kurt Klaudi Klausen et al. (2005). Modernisering av offentlig sektor : utfordringer, metoder og dilemmaer. (ekstern lenke)

Kapittel i fagbok

• Else-Marie Løberg; Erik Johnsen (2016). Psykoselidelser. (ekstern lenke)
• Erik Johnsen; Ulrik Fredrik Malt; Ole Andreas Andreassen et al. (2020). Psykofarmakologisk behandling av psykiske lidelser. (ekstern lenke)
• Ulrik Fredrik Malt; Ole Andreas Andreassen; Erik Johnsen et al. (2018). Psykofarmakologisk behandling av psykiske lidelser. (ekstern lenke)

Leserbrev

• Erik Johnsen (2017). Re: Psykiatriens indre konflikter eksponert. (ekstern lenke)
• Erik Johnsen; Ole Andreassen; Ingrid Melle et al. (2025). Antipsykotika har god effekt ved psykoselidelser. (ekstern lenke)
• Eirik Kjelby; Rolf Gjestad; Farivar Fathian et al. (2024). Reply to a Letter to the Editors From Dr de Souza and colleagues: "Unraveling the Optimal Treatment Approach for Depression in Schizophrenia Spectrum: A Quest for Clarity". (ekstern lenke)
• Erik Johnsen; Vidar Martin Steen; Rune Andreas Kroken (2021). Pragmatic antipsychotics trial—caution in interpretation – Authors' reply. (ekstern lenke)

Konferanseposter

• Liv Eggset Falkenberg; René Westerhausen; Else-Marie Løberg et al. (2012). Anterior cingulate biochemistry predicts symptom severity in schizophrenia: a magnetic resonance spectroscopy (1H-MRS) study. (ekstern lenke)
• Liv Eggset Falkenberg; René Westerhausen; Else-Marie Løberg et al. (2012). N-acetyl aspartate and glutamate levels of the anterior cingulate predict symptoms severity in schizophrenia: a magnetic resonance spectroscopy (1H-MRS) study. (ekstern lenke)
• Kristian Varden Gjerde; Christoffer Bartz-Johannessen; Else-Marie Løberg et al. (2024). Cellular adhesion molecules and cognition in drug-naïve and previously medicated patients with schizophrenia-spectrum disorders: A longitudinal study. (ekstern lenke)
• Farivar Fathian; Else-Marie Løberg; Rolf Gjestad et al. (2018). Longitudinal relationship to cognitive function in acute phase of psychosis in a pragmatic, randomized trial. (ekstern lenke)
• Magda L. Dumitru; Erik Johnsen; Lydia Brunvoll Sandøy et al. (2022). Amygdala Symmetry Predicts Distresful Auditory Verbal Hallucinations in Schizophrenia Patients. (ekstern lenke)
• Liv Eggset Falkenberg; Susanne Passow; Alexander Richard Craven et al. (2015). Aberrant association between glutamate and salience network functional connectivity in schizophrenia. (ekstern lenke)
• Else-Marie Løberg; Erik Johnsen; Hugo A Jørgensen (2009). Differential effects of four second-generation antipsychotics on cognition in acute psychosis. (ekstern lenke)
• Farivar Fathian; Else-Marie Løberg; Rolf Gjestad et al. (2017). The C-reactive protein in schizophrenia-spectrum disorders: relationship to cognitive function in acute phase of psychosis with a longitudinal perspective in a pragmatic, randomized trial. (ekstern lenke)

Konferanseabstrakt

• Siri Helle; Erik Johnsen; Rolf Gjestad et al. (2012). Clinical differences in acute-phase non-affective psychotic disorders with and without substance use. (ekstern lenke)
• Rune Kroken; Liv Mellesdal; H.A. Jørgensen et al. (2012). ANTIPSYCHOTIC TREATMENT FOR PATIENTS WITH SCHIZOPHRENIA; PATIENT-DECIDED AND CLINICIAN-DECIDED DISCONTINUATIONS. (ekstern lenke)
• Siri Helle; R. Gjestad; Erik Johnsen et al. (2013). Cognitive changes in non-affective psychosis the first 4-6 weeks after admission to a psychiatric acute ward: effects of substance use. (ekstern lenke)
• Erik Johnsen; Farivar Fathian; Rolf Gjestad et al. (2014). C-reactive protein levels are inversely associated with neurocognitive performance in acutely admitted patients with psychosis. (ekstern lenke)
• Rune Kroken; Liv Mellesdal; Hugo A Jørgensen et al. (2010). Prediction of un-planned readmission to hospital for patients with schizophrenia - a cohort-study of 277 patients. (ekstern lenke)
• Inge Joa; Tor Ketil Larsen; Lill Kjersti Skryten et al. (2012). Primary prevention of Psychosis (POP): a Norwegian UHR initiative. (ekstern lenke)
• Erik Johnsen; Rune Kroken; Mirsad Abaza et al. (2007). Antipsychotic-induced hyperprolactinemia and associated symptoms: A cross-sectional survey. (ekstern lenke)
• Siri Helle; Erik Johnsen; Rolf Gjestad et al. (2012). Neurocognitive functions recover from acute phase to three month-follow up in patients with non-affective psychotic disorders. (ekstern lenke)
• Erik Johnsen; Rune Kroken; Hugo A Jørgensen (2010). ANTI-DEPRESSIVE EFFECTIVENESS OF OLANZAPINE, QUETIAPINE, RISPERIDONE, AND ZIPRASIDONE: A RANDOMIZED, NATURALISTIC STUDY. (ekstern lenke)

Studieprotokoll

• Olav Nyttingnes; Tore Hofstad; Erik Johnsen et al. (2025). Study protocol for Controversies in psychiatry – antipsychotics: Long term outcomes and causal modelling of antipsychotic treatment using Norwegian Registry data. (ekstern lenke)

Fagartikkel

• Tore Hofstad; Olav Nyttingnes; Simen Markussen et al. (2023). Long term outcomes and causal modelling of compulsory inpatient and outpatient mental health care using Norwegian registry data: Protocol for a controversies in psychiatry research project. (ekstern lenke)

Konferanseforedrag

• Nina Mørkved; Mathilde Paulina Endsjø; Dagfinn Winje et al. (2016). Childhood Trauma in Schizophrenia Spectrum Disorders as Compared to Other Mental Health Disorders. (ekstern lenke)
• Liv Mellesdal; Rolf Gjestad; Erik Johnsen et al. (2013). Prospective self-harm predicted by Borderline Personality Disorder and -criteria, and PTSD Diagnosis in patients admitted to a psychiatric acute ward. (ekstern lenke)
• Nina Mørkved; Mathilde Paulina Endsjø; Dagfinn Winje et al. (2016). An Investigation of the Potential Specificity of Childhood Maltreatment Trauma in Patients With Non-Affective Psychosis as Compared to Other Mental Health Disorders. (ekstern lenke)

Fremhevet artikkel i media

• Erik Johnsen; Marit Tveito; Siv Elin Pignatiello et al. (2025). Psykiatrisk spesialistkunnskap har kort halveringstid. (ekstern lenke)

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