Blar i Publikasjoner fra Cristin - St. Olavs hospital på forfatter "Olsen, Alexander"

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    • Associations between executive functions, intelligence and adaptive behaviour in children and adolescents with mild intellectual disability 

      Gravråkmo, Sissel; Olsen, Alexander; Lydersen, Stian; Øie, Merete Glenne; Henry, Lucy; Ingul, Jo Magne (Journal article; Peer reviewed, 2022)

    • Associations between intelligence, everyday executive functions, and symptoms of mental health problems in children and adolescents with mild intellectual disability 

      Gravråkmo, Sissel; Henry, Lucy; Olsen, Alexander; Øie, Merete Glenne; Lydersen, Stian; Ingul, Jo Magne (Peer reviewed; Journal article, 2023)
      Background: Children and adolescents with intellectual disabilities have been found to have a higher prevalence of symptoms of mental health problems than the general population, but it is unclear whether these challenges ...

    • A biofeedback app for migraine: Development and usability study 

      Ingvaldsen, Sigrid Hegna; Tronvik, Erling Andreas; Brenner, Eiliv; Winnberg, Ingunn; Olsen, Alexander; Gravdahl, Gøril Bruvik; Stubberud, Anker (Peer reviewed; Journal article, 2021)
      Background: Biofeedback is effective in treating migraines. It is believed to have a beneficial effect on autonomous nervous system activity and render individuals resilient to stressors that may trigger a migraine. However, ...

    • Biofeedback Treatment App for Pediatric Migraine: Development and Usability Study 

      Stubberud, Anker; Tronvik, Erling Andreas; Olsen, Alexander; Gravdahl, Gøril Bruvik; Linde, Mattias (Peer reviewed; Journal article, 2020)
      Objective The objective of this study was to develop and investigate the usability of a biofeedback treatment smartphone app for adolescent migraine sufferers. Background Biofeedback is effective in treating pediatric ...

    • The development, inter-rater agreement and performance of a hierarchical procedure for setting the rest-interval in actigraphy data 

      Follesø, Hanna Størksen; Austad, Sigrun Borgen; Olsen, Alexander; Saksvik-Lehouillier, Ingvild (Peer reviewed; Journal article, 2021)
      The aim of this study was to develop and empirically test a hierarchical procedure for defining rest intervals in actigraphy data. Background This is a two-part study. The aim of study 1 was to identify common practices ...

    • ENIGMA-Sleep: Challenges, opportunities, and the road map 

      Tahmasian, Masoud; Aleman, André; Andreassen, Ole; Arab, Zahra; Baillet, Marion; Benedetti, Francesco; Bresser, Tom; Bright, Joanna; Chee, Michael W.L.; Chylinski, Daphne; Cheng, Wei; Deantoni, Michele; Dresler, Martin; Eickhoff, Simon B.; Eickhoff, Claudia R.; Elvsåshagen, Torbjørn; Feng, Jianfeng; Foster-Dingley, Jessica C.; Ganjgahi, Habib; Grabe, Hans J.; Groenewold, Nynke A.; Ho, Tiffany C.; Bong Hong, Seung; Houenou, Josselin; Irungu, Benson; Jahanshad, Neda; Khazaie, Habibolah; Kim, Hosung; Koshmanova, Ekaterina; Kocevska, Desi; Kochunov, Peter; Lakbila-Kamal, Oti; Leerssen, Jeanne; Li, Meng; Luik, Annemarie I.; Muto, Vincenzo; Narbutas, Justinas; Nilsonne, Gustav; O’Callaghan, Victoria S.; Olsen, Alexander; Osorio, Ricardo S.; Poletti, Sara; Poudel, Govinda; Reesen, Joyce E.; Reneman, Liesbeth; Reyt, Mathilde; Riemann, Dieter; Rosenzweig, Ivana; Rostampour, Masoumeh; Saberi, Amin; Schiel, Julian; Schmidt, Christina; Schrantee, Anouk; Sciberras, Emma; Silk, Tim J.; Sim, Kang; Smevik, Hanne; Soares, Jair C.; Spiegelhalder, Kai; Stein, Dan J.; Talwar, Puneet; Tamm, Sandra; Teresi, Giana l.; Valk, Sofie L.; Van Someren, Eus; Vandewalle, Gilles; Van Egroo, Maxime; Völzke, Henry; Walter, Martin; Wassing, Rick; Weber, Frederik D.; Weihs, Antoine; Westlye, Lars Tjelta; Wright, Margaret J.; Wu, Mon-Ju; Zak, Nathalia; Zarei, Mojtaba (Peer reviewed; Journal article, 2021)
      Neuroimaging and genetics studies have advanced our understanding of the neurobiology of sleep and its disorders. However, individual studies usually have limitations to identifying consistent and reproducible effects, ...

    • Exploring the relationships between visuospatial working memory, math, letter-sound knowledge, motor competence, and gender in first grade children: A correlational study 

      Eriksen, Adrian Dybfest; Olsen, Alexander; Sigmundsson, Hermundur (Peer reviewed; Journal article, 2023)
      Introduction: Development of crucial skills accelerates at the start of formal schooling, although, more knowledge is needed about the relationships between such skills. The current study explored the relationships between ...

    • Frontoamygdala hyperconnectivity predicts affective dysregulation in adolescent moderate-severe TBI 

      Bickart, Kevin C.; Olsen, Alexander; Dennis, Emily L.; Babikian, Talin; Hoffman, Ann N.; Snyder, Aliyah; Sheridan, Christopher A.; Fischer, Jesse T.; Giza, Christopher C.; Choe, Meeryo C.; Asarnow, Robert F. (Peer reviewed; Journal article, 2022)
      In survivors of moderate to severe traumatic brain injury (msTBI), affective disruptions often remain underdetected and undertreated, in part due to poor understanding of the underlying neural mechanisms. We hypothesized ...

    • High neuroticism is associated with reduced negative affect following sleep deprivation 

      Saksvik-Lehouillier, Ingvild; Langvik, Eva; Saksvik, Simen Berg; Kallestad, Håvard; Follesø, Hanna Størksen; Austad, Sigrun Borgen; Dahlberg, Johanna; Ringen, Heidi; Tanum, Tiril Kristine; Sørengaard, Torhild Anita; Karlsen, Håvard Rudi; Smedbøl, Trine; Olsen, Alexander (Peer reviewed; Journal article, 2021)
      The aim was to investigate how neuroticism moderates the affective consequences of personalized mild-moderate partial sleep deprivation. A total of 52 healthy subjects aged 18–35 years completed the NEO PI-3 at baseline, ...

    • Multimodal Analysis of Secondary Cerebellar Alterations After Pediatric Traumatic Brain Injury 

      Keleher, Finian; Lindsey, Hannah; Kerestes, Rebecca; Amiri, Houshang; Asarnow, Robert; Babikian, Talin; Bartnik-Olson, Brenda L.; Bigler, Erin D; Caeyenberghs, Karen; Ewing-Cobbs, Linda; Giza, Christopher C.; Goodrich-Hunsaker, Naomi J; Hodges, Cooper B.; Hoskinson, Kristen R; Irimia, Andrei; Königs, Marsh; Max, Jeffrey; Newsome, Mary R; Olsen, Alexander; Ryan, Nicholas P; Schmidt, Adam T.; Stein, Dan J; Suskauer, Stacy J; Ware, Ashley L; Wheeler, Anne L; Zielinski, Brandon A; Thompson, Paul; Harding, Ian H.; Tate, David F.; Wilde, Elisabeth; Dennis, Emily L (Peer reviewed; Journal article, 2023)
      IMPORTANCE: Traumatic brain injury (TBI) is known to cause widespread neural disruption in the cerebrum. However, less is known about the association of TBI with cerebellar structure and how such changes may alter executive ...

    • The prevalence and stability of sleep-wake disturbance and fatigue throughout the first year after mild traumatic brain injury 

      Saksvik, Simen Berg; Karaliute, Migle; Kallestad, Håvard; Follestad, Turid; Asarnow, Robert F.; Vik, Anne; Håberg, Asta; Skandsen, Toril; Olsen, Alexander (Peer reviewed; Journal article, 2020)
      In this prospective, longitudinal study, we aimed to determine the prevalence and stability of sleep-wake disturbance (SWD) and fatigue in a large representative sample of patients (Trondheim mild traumatic brain injury ...

    • A protocol for the development and validation of a virtual reality-based clinical test of social cognition 

      Matre, Martin; Johansen, Truls Sveløkken; Olsen, Alexander; Tornås, Sveinung; Martinsen, Anne Catrine Trægde; Lund, Anne; Becker, Frank; Brunborg, Cathrine; Spikman, Joke; Ponsford, Jennie; Neumann, Dawn; McDonald, Skye; Løvstad, Marianne (Peer reviewed; Journal article, 2023)
      Background Impairments in social cognition are common after traumatic brain injury (TBI) and may have severe negative consequences for patients and their families. Most tests of social cognition have limited ecological ...

    • The Relationship of Psychiatric Symptoms with Performance-Based and Self-Reported Cognitive Function After Ischemic Stroke 

      Kliem, Elisabeth; Gjestad, Elise Ødegård; Ryum, Truls; Olsen, Alexander; Thommessen, Bente; Indredavik, Bent; Bieliauskas, Linas; Due-Tønnessen, Paulina; Fladby, Tormod; Grambaite, Ramune (Peer reviewed; Journal article, 2021)
      Objective: Findings on the relationship of psychiatric symptoms with performance-based and self-reported cognitive function post-stroke are inconclusive. We aimed to (1) study the relation of depression and anxiety to ...

    • Toward a global and reproducible science for brain imaging in neurotrauma: the ENIGMA adult moderate/severe traumatic brain injury working group 

      Olsen, Alexander; Babikian, Talin; Bigler, Erin D.; Caeyenberghs, Karen; Conde, Virginia; Dams-O’Connor, Kristen; Dobryakova, Ekaterina; Genova, Helen; Grafman, Jordan; Håberg, Asta; Heggland, Ingrid; Hellstrøm, Torgeir; Hodges, Cooper B.; Irimia, Andrei; Jha, Ruchira M.; Johnson, Paula K.; Koliatsos, Vassilis E.; Levin, Harvey; Li, Lucia M.; Lindsey, Hannah M.; Livny, Abigail; Løvstad, Marianne; Medaglia, John; Menon, David; Mondello, Stefania; Monti, Martin M.; Newcombe, Virginia F.J.; Petroni, Agustin; Ponsford, Jennie; Sharp, David; Spitz, Gershon; Westlye, Lars Tjelta; Thompson, Paul M.; Dennis, Emily L.; Tate, David; Wilde, Elisabeth A.; Hillary, Frank G. (Peer reviewed; Journal article, 2020)
      The global burden of mortality and morbidity caused by traumatic brain injury (TBI) is significant, and the heterogeneity of TBI patients and the relatively small sample sizes of most current neuroimaging studies is a major ...

    • Trajectories of Persistent Postconcussion Symptoms and Factors Associated With Symptom Reporting After Mild Traumatic Brain Injury 

      Fordal, Linda; Stenberg, Jonas; Iverson, Grant L.; Saksvik, Simen Berg; Karaliute, Migle; Vik, Anne; Olsen, Alexander; Skandsen, Toril (Peer reviewed; Journal article, 2021)
      Objective To examine the trajectories of persistent postconcussion symptoms (PPCS) after mild traumatic brain injury (MTBI) and to investigate which injury-related and personal factors are associated with symptom reporting. ...

    • Workplace Factors Associated With Return to Work After Mild-to-Moderate Traumatic Brain Injury 

      Fure, Silje Christine Reistad; Howe, Emilie; Andelic, Nada; Brunborg, Cathrine; Olsen, Alexander; Rike, Per-Ola; Spjelkavik, Øystein; Enehaug, Heidi; Røe, Cecilie; Løvstad, Marianne (Peer reviewed; Journal article, 2022)
      Abstract Objective: Sociodemographic and injury-related predictors for return to work (RTW) after mild-to-moderate traumatic brain injury (TBI) have been extensively explored. However, there is a knowledge gap regarding ...