Vitenskapelig artikkel

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

Kronikk

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

Annet

• Nyttingnes, Olav; Hofstad, Tore; Johnsen, Erik 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)

Leserinnlegg

• Johnsen, Erik; Andreassen, Ole; Melle, Ingrid et al. (2025). Antipsykotika har god effekt ved psykoselidelser. (ekstern lenke)
• Kjelby, Eirik; Gjestad, Rolf; Fathian, Farivar 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)
• Johnsen, Erik; Steen, Vidar Martin; Kroken, Rune Andreas (2021). Pragmatic antipsychotics trial—caution in interpretation – Authors' reply. (ekstern lenke)
• Johnsen, Erik (2017). Re: Psykiatriens indre konflikter eksponert. (ekstern lenke)

Vitenskapelig oversiktsartikkel/review

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

Poster

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

Fagartikkel

• Hofstad, Tore; Nyttingnes, Olav; Markussen, Simen 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)

Doktorgradsavhandling

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

Faglig kapittel

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

Vitenskapelig foredrag

• Mørkved, Nina; Endsjø, Mathilde Paulina; Winje, Dagfinn 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)
• Mørkved, Nina; Endsjø, Mathilde Paulina; Winje, Dagfinn et al. (2016). Childhood Trauma in Schizophrenia Spectrum Disorders as Compared to Other Mental Health Disorders. (ekstern lenke)
• Mellesdal, Liv; Gjestad, Rolf; Johnsen, Erik 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)

Fagbok

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

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