Blar i NTNU Open på forfatter "Olsen, Alexander"
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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 ... -
Exercise Intensity-Dependent Effects on Cognitive Control Function during and after Acute Treadmill Running in Young Healthy Adults
Wohlwend, Martin Rainer; Olsen, Alexander; Håberg, Asta; Palmer, Helen (Journal article; Peer reviewed, 2017)The idea that physical activity differentially impacts upon performance of various cognitive tasks has recently gained increased interest. However, our current knowledge about how cognition is altered by acute physical ... -
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 ... -
Global Outcome and Cognitive Control Function in Moderate-to-Severe Traumatic Brain Injury - Classification and Prediction
Ek, John André Nebb (Master thesis, 2020)Previous research has shown a close relationship between unfavourable global outcome and cognitive control dysfunction in moderate-to-severe traumatic brain injury. Proponents of graph theory frequently proclaim its possible ... -
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, ... -
Irregular sleep and mental health: Associations between the Sleep Regularity Index and symptoms of mental health issues in a healthy population
Jakobsen, Sofie (Master thesis, 2021)Forskning viser hvordan søvn og mental helse henger tett sammen, men det er likevel mye vi ikke vet om denne sammenhengen. Studier enes om negative konsekvenser av for lite søvn, og nylig forskning indikerer også at ... -
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 ... -
Long-term follow-up of mental health, health-related quality of life and associations with motor skills in young adults born preterm with very low birth weight
Husby, Ingrid Marie; Stray, Kaia; Olsen, Alexander; Lydersen, Stian; Indredavik, Marit Sæbø; Brubakk, Ann-Mari; Skranes, Jon Sverre; Evensen, Kari Anne Indredavik (Journal article; Peer reviewed, 2016)Background: Being born with very low birth weight(VLBW:≤1500 g) is related to long-term disability and neurodevelopmental problems, possibly affecting mental health and health-related quality of life (HRQoL). However, ... -
Magnetic resonance spectroscopy of fiber tracts in children with traumatic brain injury: A combined MRS - Diffusion MRI study
Dennis, Emily L.; Babikian, Talin; Alger, Jeffry; Rashid, Faisal; Villalon-Reina, Julio E.; Jin, Yan; Olsen, Alexander; Mink, Richard; Babbitt, Christopher; Johnson, Jeffrey; Giza, Christopher C.; Thompson, Paul M.; Asarnow, Robert F. (Peer reviewed; Journal article, 2018)Traumatic brain injury can cause extensive damage to the white matter (WM) of the brain. These disruptions can be especially damaging in children, whose brains are still maturing. Diffusion magnetic resonance imaging (dMRI) ... -
Medierer habituell fysisk aktivitet forholdet mellom personlighet og subjektiv søvnkvalitet? En kryss-seksjonell studie
Melsæter, Ole Eirik (Master thesis, 2022)Dårlig søvnkvalitet er et voksende globalt helseproblem som rammer anslagsvis 115 millioner mennesker i USA og Europa. Studier har gitt indikasjon for at personlighet er assosiert med subjektiv søvnkvalitet, samtidig er ... -
Metakognitiv terapi for vedvarende symptomber etter milde traumatiske hjerneskader - Finnes det en sammenheng mellom behandlingseffekt og oppmerksomhetskontroll?
Strømseng, Marie Kjølstad (Master thesis, 2018)Mange mennesker blir hvert år rammet av milde traumatiske hjerneskader. Etter skaden er det vanlig at pasienten opplever fysiske, kognitive og emosjonelle symptomer. De fleste blir helt friske innen tre måneder, men noen ... -
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 ... -
Mind, Brain and Education: Exploring gender differences and the relationships between skills in first grade children
Eriksen, Adrian Dybfest (Doctoral theses at NTNU;2022:223, Doctoral thesis, 2022)Summary Gender differences and skills in first grade Knowledge about skill development and gender differences in school is very important for an evidence-based school, in order to ensure that every pupil gets ...