Browsing Bergen Open Research Archive by Author "Sommer, Iris Else Clara"
Now showing items 1-13 of 13
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Aberrant resting-state oscillatory brain activity in Parkinson's disease patients with visual hallucinations: An MEG source-space study
Dauwan, Meenakshi; Hoff, Jorrit I; Vriens, Els M; Hillebrand, Arjan; Stam, Cornelis J; Sommer, Iris Else Clara (Peer reviewed; Journal article, 2019)To gain insight into possible underlying mechanism(s) of visual hallucinations (VH) in Parkinson's disease (PD), we explored changes in local oscillatory activity in different frequency bands with source-space magnetoenc ... -
Auditory hallucinations, top-down processing and language perception: a general population study
de Boer, Janna N.; Linszen, Mascha M.J.; de Vries, J. Hans; Schutte, Maya J.L.; Begemann, Marieke J.H.; Heringa, Sophie M.; Bohlken, Marc Marijn; Hugdahl, Kenneth; Aleman, André; Wijnen, Frank N.K.; Sommer, Iris Else Clara (Peer reviewed; Journal article, 2019)Background: Studies investigating the underlying mechanisms of hallucinations in patients with schizophrenia suggest that an imbalance in top-down expectations v. bottom-up processing underlies these errors in perception. ... -
Constructing the immune signature of schizophrenia for clinical use and research; an integrative review translating descriptives into diagnostics
Kroken, Rune Andreas; Sommer, Iris Else Clara; Steen, Vidar Martin; Dieset, Ingrid; Johnsen, Erik (Peer reviewed; Journal article, 2019)Schizophrenia is considered a syndrome comprised by several disease phenotypes, covering a range of underlying pathologies. One of these disease mechanisms seems to involve immune dysregulation and neuroinflammation. While ... -
Efficacy of different types of cognitive enhancers for patients with schizophrenia: a meta-analysis
Sinkeviciute, Igne; Begemann, Marieke; Prikken, Merel; Oranje, Bob; Johnsen, Erik; Lei, Wan U.; Hugdahl, Kenneth; Kroken, Rune Andreas; Rau, Carina; Jacobs, Jolien D.; Mattaroccia, Silvia; Sommer, Iris Else Clara (Peer reviewed; Journal article, 2018)Cognitive impairment is a core feature of schizophrenia, which is predictive for functional outcomes and is, therefore, a treatment target in itself. Yet, literature on efficacy of different pharmaco-therapeutic options ... -
Functional brain networks in the schizophrenia spectrum and bipolar disorder with psychosis
van Dellen, Edwin; Börner, Corinna; Schutte, Maya; van Montfort, Simone; Abramovic, Lucija; Boks, Marco P.; Cahn, Wiepke; van Haren, Neeltje E.M.; Mandl, René; Stam, Cornelis J.; Sommer, Iris Else Clara (Journal article; Peer reviewed, 2020)Psychotic experiences have been proposed to lie on a spectrum, ranging from subclinical experiences to treatment-resistant schizophrenia. We aimed to characterize functional connectivity and brain network characteristics ... -
Hallucinations in older adults: A practical review
Badcock, Johanna C.; Larøi, Frank; Kamp, Karina; Kelsall-Foreman, India; Bucks, Romola S.; Weinborn, Michael; Begemann, Marieke; Taylor, John-Paul; Collerton, Daniel; O'Brien, John T.; El Haj, Mohamad; Ffytche, Dominic; Sommer, Iris Else Clara (Journal article; Peer reviewed, 2020)By 2050, it is estimated that 16% of people will be aged above 65 years, compared with 9% in 2019.1 Population aging is driving increased attention to the physical and mental health needs of older adults. Here, our focus ... -
Hostility and aggressive behaviour in first episode psychosis: Results from the OPTiMiSE trial
Faay, Margo D.M.; van Baal, G. Caroline M.; Arango, Celso; Diaz-Caneja, Covadonga M.; Berger, Gregor; Leucht, Stefan; Bobes, Julio; Saiz, Pilar A.; García-Portilla, María Paz; van de Brug, Resy; Petter, Jocelyn; Winter-van Rossum, Inge; Sommer, Iris Else Clara (Journal article; Peer reviewed, 2020)Aim: The aim of this paper is to determine clinical factors related to hostility and disturbing and aggressive behaviour and to examine the effect of medication on these behaviours in FEP. Methods: Data from phase I and ... -
Mapping psychotic-like experiences: Results from an online survey
Kusztrits, Isabella; Larøi, Frank; Laloyaux, Julien Freddy; Marquardt, Lynn Anne; Sinkeviciute, Igne; Kjelby, Eirik; Johnsen, Erik; Sommer, Iris Else Clara; Hugdahl, Kenneth; Hirnstein, Marco (Journal article; Peer reviewed, 2021)Suggestions have been made that psychotic‐like experiences (PLEs), such as hallucinatory and delusional experiences, exist on a continuum from healthy individuals to patients with a diagnosis of schizophrenia. We used the ... -
Occurrence and phenomenology of hallucinations in the general population: A large online survey
Linszen, Mascha M. J.; de Boer, Janna N.; Schutte, Maya J. L.; Begemann, Marieke J. H.; de Vries, Jacqueline; Koops, Sanne; Blom, Renske E.; Bohlken, Marc M.; Heringa, Sophie M.; Blom, Jan Dirk; Sommer, Iris Else Clara (Journal article; Peer reviewed, 2022)Although epidemiological studies report that hallucinations occur in 6–15% of the general population, little is known about their phenomenology. To overcome this paucity, this study investigates the phenomenological ... -
Paracingulate sulcus morphology and hallucinations in clinical and nonclinical groups
Garrison, Jane R; Fernyhough, Charles; McCarthy-Jones, Simon; Simons, Jon S; Sommer, Iris Else Clara (Peer reviewed; Journal article, 2019)Hallucinations are a characteristic symptom of psychotic mental health conditions that are also experienced by many individuals without a clinical diagnosis. Hallucinations in schizophrenia have been linked to differences ... -
Physical exercise improves quality of life, depressive symptoms, and cognition across chronic brain disorders: a transdiagnostic systematic review and meta-analysis of randomized controlled trials
Dauwan, Meenakshi; Begemann, Marieke J.H.; Slot, Margot I.E.; Lee, Edwin H.M.; Scheltens, Philip; Sommer, Iris Else Clara (Peer reviewed; Journal article, 2019)We performed a meta-analysis to synthesize evidence on the efficacy and safety of physical exercise as an add-on therapeutic intervention for quality of life (QoL), depressive symptoms and cognition across six chronic brain ... -
The questionnaire for psychotic experiences: An examination of the validity and reliability
Rossell, Susan L.; Schutte, Maya J.L.; Toh, Wei Lin; Thomas, Neil; Strauss, Clara; Linszen, Mascha M.J.; van Dellen, Edwin; Heringa, Sophie M.; Teunisse, Rob; Slotema, Christina W.; Sommer, Iris Else Clara (Peer reviewed; Journal article, 2019-02-01)Psychotic experiences are prevalent across a wide variety of psychiatric, neurological, and medical conditions. Yet current assessments are often designed for one disorder, or are limited in their examination of phenomenological ... -
Stratification and prediction of remission in first-episode psychosis patients: the OPTiMiSE cohort study
Martinuzzi, Emanuela; Barbosa, Susana; Daoudlarian, Douglas; Bel Haj Ali, Wafa; Gilet, Cyprien; Fillatre, Lionel; Khalfallah, Olfa; Troudet, Réjane; Jamain, Stéphane; Fond, Guillaume; Sommer, Iris Else Clara; Leucht, Stefan; Dazzan, Paola; McGuire, Philip; Arango, Celso; Diaz-Caneja, Covadonga M.; Fleischhacker, Wolfgang; Rujescu, Dan; Glenthøj, Birte; Winter, Inge; Kahn, René Sylvain; Yolken, Robert; Lewis, Shon; Drake, Richard; Davidovic, Laetitia; Leboyer, Marion; Glaichenhaus, Nicolas (Journal article; Peer reviewed, 2019)Early response to first-line antipsychotic treatments is strongly associated with positive long-term symptomatic and functional outcome in psychosis. Unfortunately, attempts to identify reliable predictors of treatment ...