Blar i St. Olavs hospital på forfatter "Olsen, Alexander"
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Adhd and mental health symptoms in the identification of young adults with increased risk of alcohol dependency in the general population—the hunt4 population study
Lauvsnes, Anders Dahlen Forsmo; Langaas, Mette; Olsen, Alexander; Vassileva, Jasmin; Spigset, Olav; Gråwe, Rolf Wilhelm (Peer reviewed; Journal article, 2021)Symptoms of ADHD are strongly associated with alcohol use disorders, and mental health symptoms attenuate this relationship. There is limited knowledge about how specific symptoms of inattentiveness and hyperactivity/impulsivity ... -
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 ... -
Cognitive Reserve Moderates Cognitive Outcome After Mild Traumatic Brain Injury
Stenberg, Jonas; Håberg, Asta; Follestad, Turid; Olsen, Alexander; Iverson, Grant L.; Terry P., Douglas; Karlsen, Rune Hatlestad; Saksvik, Simen Berg; Karaliute, Migle; Ek, John Andre Nebb; Skandsen, Toril; Vik, Anne (Journal article; Peer reviewed, 2019)Objective To investigate whether cognitive reserve moderates differences in cognitive functioning between patients with mild traumatic brain injury (MTBI) and controls without MTBI and to examine whether patients with ... -
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 and global neuroscience: A decade of large-scale studies of the brain in health and disease across more than 40 countries
Thompson, Paul M.; Jahanshad, Neda; Ching, Christopher R.K.; Salminen, Lauren E.; Thomopoulos, Sophia I.; Bright, Joanna; Baune, Bernhard T.; Bertolin, Sara; Bralten, Janita; Bruin, Willem B.; Bulow, Robin; Chen, Jian; Chye, Yann; Dannlowski, Udo; de Kovel, Carolien G.F.; Donohoe, Gary; Eyler, Lisa T.; Faraone, Stephen V.; Favre, Pauline; Filippi, Courtney A.; Frodl, Thomas; Garijo, Daniel; Gil, Yolanda; Grabe, Hans J.; Grasby, Katrina L.; Hajek, Tomas; Han, Laura K.M.; Hatton, Sean N.; Hilbert, Kevin; Ho, Tiffany C.; Holleran, Laurena; Homuth, Georg; Hosten, Norbert; Houenou, Josselin; Ivanov, Iliyan; Jia, Tianye; Kelly, Sinead; Klein, Marieke; Kwon, Jun Soo; Laansma, Max A.; Leerssen, Jeanne; Lueken, Ulrike; Nunes, Abraham; O'Neill, Joseph; Opel, Nils; Piras, Fabrizio; Piras, Federica; Postema, Merel C.; Pozzi, Elena; Shatokhina, Natalia; Soriano-Mas, Carles; Spalletta, Gianfranco; Sun, Daqiang; Teumer, Alexander; Tilot, Amanda K.; Tozzi, Leonardo; van der Merwe, Celia; van Someren, Eus J.W.; van Wingen, Guido A.; Völzke, Henry; Walton, Esther; Wang, Lei; Winkler, Anderson M.; Wittfeld, Katharina; Wright, Margaret J.; Yun, Je-Yeon; Zhang, Guohao; Zhang-James, Yanli; Adhikari, Bhim M.; Agartz, Ingrid; Aghajani, Moji; Aleman, André; Althoff, Robert R.; Altmann, Andre; Andreassen, Ole Andreas; Baron, David A.; Bartnik-Olson, Brenda L.; Bas-Hoogendam, Janna Marie; Baskin-Sommers, Arielle R.; Bearden, Carrie E.; Berner, Laura A.; Boedhoe, Premika S.W.; Brouwer, Rachel M.; Buitelaar, Jan K.; Caeyenberghs, Karen; Cecil, Charlotte A.M.; Cohen, Ronald A.; Cole, James H.; Conrod, Patricia J.; De Brito, Stephane A.; de Zwarte, Sonja M.C.; Dennis, Emily L.; Desrivieres, Sylvane; Dima, Danai; Ehrlich, Stefan; Esopenko, Carrie; Fairchild, Graeme; Fisher, Simon E.; Fouche, Jean-Paul; Francks, Clyde; Frangou, Sophia; Franke, Barbara; Garavan, Hugh P.; Glahn, David C.; Groenewold, Nynke A.; Gurholt, Tiril Pedersen; Gutman, Boris A.; Hahn, Tim; Harding, Ian H.; Hernaus, Dennis; Hibar, Derrek P.; Hillary, Frank G.; Hoogman, Martine; Hulshoff Pol, Hilleke E.; Jalbrzikowski, Maria; Karkashadze, George A.; Klapwijk, Eduard T.; Knickmeyer, Rebecca C.; Kochunov, Peter; Koerte, Inga K.; Kong, Xiang-Zhen; Liew, Sook-Lei; Lin, Alexander P.; Logue, Mark W.; Luders, Eileen; Macciardi, Fabio; Mackey, Scott; Mayer, Andrew R.; McDonald, Carrie R.; McMahon, Agnes B.; Medland, Sarah E.; Modinos, Gemma; Morey, Rajendra A.; Mueller, Sven C.; Mukherjee, Pratik; Namazova-Baranova, Leyla; Nir, Talia M; Olsen, Alexander; Paschou, Peristera; Pine, Daniel S.; Pizzagalli, Fabrizio; Rentería, Miguel E.; Rohrer, Jonathan D.; Sämann, Philipp G.; Schmaal, Lianne; Schumann, Gunter; Shiroishi, Mark S.; Sisodiya, Sanjay M.; Smit, Dirk J.A.; Sønderby, Ida Elken; Stein, Dan J.; Stein, Jason L.; Tahmasian, Masoud; Tate, David F.; Turner, Jessica A.; van den Heuvel, Odile A; Van Der Wee, Nic J.A.; van der Werf, Ysbrand D.; van Erp, Theo G.M.; van Haren, Neeltje E.M.; van Rooij, Daan; van Velzen, Laura S.; Veer, Ilya M.; Veltman, Dick J.; Villalon-Reina, Julio E.; Walter, Henrik; Whelan, Christopher D.; Wilde, Elisabeth A.; Zarei, Mojtaba; Zelman, Vladimir (Peer reviewed; Journal article, 2020)This review summarizes the last decade of work by the ENIGMA (Enhancing NeuroImaging Genetics through Meta Analysis) Consortium, a global alliance of over 1400 scientists across 43 countries, studying the human brain in ... -
ENIGMA brain injury: Framework, challenges, and opportunities
Dennis, Emily L.; Baron, David; Bartnik-Olson, Brenda L.; Caeyenberghs, Karen; Esopenko, Carrie; Hillary, Frank G.; Kenney, Kimbra; Koerte, Inga K.; Lin, Alexander P.; Mayer, Andrew R.; Mondello, Stefania; Olsen, Alexander; Thompson, Paul M.; Tate, David; Wilde, Elisabeth A. (Peer reviewed; Journal article, 2020)Traumatic brain injury (TBI) is a major cause of disability worldwide, but the heterogeneous nature of TBI with respect to injury severity and health comorbidities make patient outcome difficult to predict. Injury severity ... -
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, ... -
Examining 3-month test-retest reliability and reliable change using the Cambridge Neuropsychological Test Automated Battery
Karlsen, Rune Hatlestad; Karr, Justin E.; Saksvik, Simen Berg; Lundervold, Astri J.; Hjemdal, Odin; Olsen, Alexander; Iverson, Grant L.; Skandsen, Toril (Peer reviewed; Journal article, 2020)The Cambridge Neuropsychological Test Automated Battery (CANTAB) is a battery of computerized neuropsychological tests commonly used in Europe in neurology and psychiatry studies, including clinical trials. The purpose of ... -
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 ... -
Forecasting migraine with machine learning based on mobile phone diary and wearable data
Stubberud, Anker; Ingvaldsen, Sigrid Hegna; Brenner, Eiliv; Winnberg, Ingunn Grøntveit; Olsen, Alexander; Gravdahl, Gøril Bruvik; Matharu, Manjit Singh; Nachev, Parashkev; Tronvik, Erling Andreas (Peer reviewed; Journal article, 2023)Introduction Triggers, premonitory symptoms and physiological changes occur in the preictal migraine phase and may be used in models for forecasting attacks. Machine learning is a promising option for such predictive ... -
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 ... -
Functional Brain Hyperactivations Are Linked to an Electrophysiological Measure of Slow Interhemispheric Transfer Time after Pediatric Moderate/Severe Traumatic Brain Injury
Olsen, Alexander; Babikian, Talin; Dennis, Emily L.; Ellis-Blied, Monica U.; Giza, Christopher C.; Marion, Sarah DeBoard; Mink, Richard; Johnson, Jeffrey; Babbitt, Christopher; Thompson, Paul M.; Asarnow, Robert F. (Peer reviewed; Journal article, 2020)Increased task-related blood oxygen level dependent (BOLD) activation is commonly observed in functional magnetic resonance imaging (fMRI) studies of moderate/severe traumatic brain injury (msTBI), but the functional ... -
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, ... -
Life after adolescent and adult moderate and severe traumatic brain injury: self-reported executive, emotional, and behavioural function 2-5 years after injury
Finnanger, Torun Gangaune; Olsen, Alexander; Skandsen, Toril; Lydersen, Stian; Vik, Anne; Evensen, Kari A. Indredavik; Catroppa, Cathy; Håberg, Asta; Andersson, Stein; Indredavik, Marit Sæbø (Peer reviewed; Journal article, 2015)Survivors of moderate-severe Traumatic Brain Injury (TBI) are at risk for long-term cognitive, emotional, and behaviouralproblems. This prospective cohort study investigated self-reported executive, emotional, and behavioural ... -
Methodology Matters: Comparing Approaches for Defining Persistent Symptoms after Mild Traumatic Brain Injury
Karaliute, Migle; Saksvik, Simen Berg; Smevik, Hanne; Follestad, Turid; Einarsen, Cathrine Elisabeth; Vik, Anne; Håberg, Asta; Iverson, Grant L.; Skandsen, Toril; Olsen, Alexander (Peer reviewed; Journal article, 2021)Some people experience persistent post-concussion symptoms (PPCS) after mild traumatic brain injury (mTBI). A meaningful clinical classification and scientific progress are hampered by a lack of consensus regarding the ... -
Mild to moderate partial sleep deprivation is associated with increased impulsivity and decreased positive affect in young adults
Saksvik-Lehouillier, Ingvild; Saksvik, Simen Berg; Dahlberg, Berit Johanna; Tanum, Tiril Kristine; Ringen, Heidi; Karlsen, Håvard Rudi; Smedbøl, Trine; Sørengaard, Torhild Anita; Stople, Mailen; Kallestad, Håvard; Olsen, Alexander (Peer reviewed; Journal article, 2020)The effects of mild–moderate partial sleep deprivation on affective and cognitive functioning were evaluated in a naturalistic home environment, mimicking short sleep typically caused by demands from work or society. A ... -
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 ...