Mathias Valstad

• Ayorech, Ziada; Torvik, Fartein Ask; Cheesman, Rosa; Eilertsen, Espen M.; Valstad, Mathias & Bjørndal, Ludvig Daae [Show all 9 contributors for this article] (2024). The structure of psychiatric comorbidity without selection and assortative mating. Translational Psychiatry. ISSN 2158-3188. 14(1), p. 1–9. doi: 10.1038/s41398-024-02768-4.
• Slapø, Nora Berz; Nerland, Stener; Jørgensen, Kjetil Nordbø; Mørch-Johnsen, Lynn Egeland; Pettersen, Johanne Hagen & Roelfs, Daniel [Show all 22 contributors for this article] (2023). Auditory Cortex Thickness Is Associated With N100 Amplitude in Schizophrenia Spectrum Disorders. Schizophrenia Bulletin Open. ISSN 2632-7899. 4(1). doi: 10.1093/schizbullopen/sgad015. Full text in Research Archive
• Slapø, Nora Berz; Jørgensen, Kjetil Nordbø; Elvsåshagen, Torbjørn; Nerland, Stener; Roelfs, Daniel & Valstad, Mathias [Show all 18 contributors for this article] (2023). Relationship between function and structure in the visual cortex in healthy individuals and in patients with severe mental disorders. Psychiatry Research : Neuroimaging. ISSN 0925-4927. 332. doi: 10.1016/j.pscychresns.2023.111633. Full text in Research Archive Show summary

  Patients with schizophrenia spectrum disorders (SCZspect) and bipolar disorders (BD) show impaired function in the primary visual cortex (V1), indicated by altered visual evoked potential (VEP). While the neural substrate for altered VEP in these patients remains elusive, altered V1 structure may play a role. One previous study found a positive relationship between the amplitude of the P100 component of the VEP and V1 surface area, but not V1 thickness, in a small sample of healthy individuals. Here, we aimed to replicate these findings in a larger healthy control (HC) sample (n = 307) and to examine the same relationship in patients with SCZspect (n = 30) or BD (n = 45). We also compared the mean P100 amplitude, V1 surface area and V1 thickness between controls and patients and found no significant group differences. In HC only, we found a significant positive P100-V1 surface area association, while there were no significant P100-V1 thickness relationships in HC, SCZspect or BD. Together, our results confirm previous findings of a positive P100-V1 surface area association in HC, whereas larger patient samples are needed to further clarify the function-structure relationship in V1 in SCZspect and BD.

• Valstad, Mathias; Roelfs, Daniel; Slapø, Nora Berz; Timpe, Clara Marie Fides; Rai, Ahsan & Matziorinis, Anna Maria [Show all 24 contributors for this article] (2021). Evidence for Reduced Long-Term Potentiation-Like Visual Cortical Plasticity in Schizophrenia and Bipolar Disorder. Schizophrenia Bulletin. ISSN 0586-7614. 47(6), p. 1751–1760. doi: 10.1093/schbul/sbab049. Full text in Research Archive
• Valstad, Mathias; Moberget, Torgeir; Roelfs, Daniël Thomas Heimen; Slapø, Nora Berz; Timpe, Clara Marie Fides & Beck, Dani [Show all 18 contributors for this article] (2020). Experience-dependent modulation of the visual evoked potential: Testing effect sizes, retention over time, and associations with age in 415 healthy individuals. NeuroImage. ISSN 1053-8119. doi: 10.1016/j.neuroimage.2020.117302. Full text in Research Archive
• Benjamin, Silje Beatrice Rognås; Valstad, Mathias; Elvsåshagen, Torbjørn; Jönsson, Erik Gunnar; Moberget, Torgeir & Winterton, Adriano [Show all 14 contributors for this article] (2020). Heart rate variability is associated with disease severity in psychosis spectrum disorders. Progress in Neuro-psychopharmacology and Biological Psychiatry. ISSN 0278-5846. 00:110108, p. 1–8. doi: 10.1016/j.pnpbp.2020.110108. Full text in Research Archive
• Valstad, Mathias; Alvares, Gail A.; Egknud, Maiken; Matziorinis, Anna Maria; Andreassen, Ole Andreas & Westlye, Lars Tjelta [Show all 7 contributors for this article] (2017). The correlation between central and peripheral oxytocin concentrations: A systematic review and meta-analysis. Neuroscience and Biobehavioral Reviews. ISSN 0149-7634. 78, p. 117–124. doi: 10.1016/j.neubiorev.2017.04.017. Full text in Research Archive
• Quintana, Daniel; Westlye, Lars Tjelta; Hope, Sigrun; Nærland, Terje; Elvsåshagen, Torbjørn & Dørum, Erlend Solberg [Show all 16 contributors for this article] (2017). Dose-dependent social-cognitive effects of intranasal oxytocin delivered with novel Breath Powered device in adults with autism spectrum disorder: a randomized placebo-controlled double-blind crossover trial. Translational Psychiatry. ISSN 2158-3188. e1136(7), p. 1–9. doi: 10.1038/tp.2017.103. Full text in Research Archive
• Valstad, Mathias; Alvares, Gail A.; Andreassen, Ole Andreas; Westlye, Lars Tjelta & Quintana, Daniel (2016). The relationship between central and peripheral oxytocin concentrations: a systematic review and meta-analysis protocol. Systematic Reviews. ISSN 2046-4053. 5(49). doi: 10.1186/s13643-016-0225-5. Full text in Research Archive

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• Ayorech, Ziada; Torvik, Fartein Ask; Cheesman, Rosa Catherine Gillespie; Eilertsen, Espen Moen; Valstad, Mathias & Bjørndal, Ludvig Daae [Show all 9 contributors for this article] (2023). Leveraging family data can reveal the role of selection bias in genomic research.

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