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Sökning: WFRF:(Furmark T)

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  • Andersson, G, et al. (författare)
  • Funktionell neuroanatomi vid tinnitus
  • 1999
  • Ingår i: Svenska läkaresällskapets riksstämma. ; , s. 283-
  • Konferensbidrag (populärvet., debatt m.m.)
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  • Andersson, G, et al. (författare)
  • Regional cerebral blood flow during tinnitus : a PET case study with lidocaine and auditory stimulation.
  • 2000
  • Ingår i: Acta Otolaryngol. - 0001-6489. ; 120:8, s. 967-72
  • Tidskriftsartikel (refereegranskat)abstract
    • Brain imaging of tinnitus has suggested central correlates of tinnitus perception. This study presents positron emission tomographic (PET) measurements of regional cerebral blood flow (rCBF) in a female tinnitus patient with bilateral left dominant tinnitus. Lidocaine infusion (75 mg during 5 min (0.2 mg/kg/min)) resulted in a 75% reduction of tinnitus and a temporary abolition of the dominant tinnitus in her left ear. Regional CBF was measured in four conditions: i) at rest while concentrating on tinnitus, ii) following maximum effect of lidocaine, iii) during sound stimulation, and iv) the following day at rest while concentrating on tinnitus. Subtraction analyses showed that tinnitus was associated with increased rCBF in the left parieto-temporal auditory cortex, including the primary and secondary auditory cortex with a focus in the parietal cortex (Brodmann areas 39, 41, 42, 21, 22). Activations were also found in right frontal paralimbic areas (Brodmann areas 47, 49 and 15). Sound stimulation resulted in bilateral activation of auditory areas. It is suggested that tinnitus is processed in primary, secondary and integrative auditory cortical areas. Tinnitus perception may involve areas related to auditory attention, while emotional processing relates to temporofrontal paralimbic areas.
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  • Andersson, G, et al. (författare)
  • Tinnitus: Funktionell neuroanatomi
  • 2000
  • Ingår i: Svensk ÖHN-tidskrift. ; , s. 21-
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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  • Bas-Hoogendam, Janna Marie, et al. (författare)
  • Voxel-based morphometry multi-center mega-analysis of brain structure in social anxiety disorder
  • 2017
  • Ingår i: NeuroImage. - : Elsevier BV. - 2213-1582. ; 16, s. 678-688
  • Tidskriftsartikel (refereegranskat)abstract
    • Social anxiety disorder (SAD) is a prevalent and disabling mental disorder, associated with significant psychiatric co-morbidity. Previous research on structural brain alterations associated with SAD has yielded inconsistent results concerning the direction of the changes in gray matter (GM) in various brain regions, as well as on the relationship between brain structure and SAD-symptomatology. These heterogeneous findings are possibly due to limited sample sizes. Multi-site imaging offers new opportunities to investigate SAD-related alterations in brain structure in larger samples.An international multi-center mega-analysis on the largest database of SAD structural T1-weighted 3T MRI scans to date was performed to compare GM volume of SAD-patients (n = 174) and healthy control (HC)-participants (n = 213) using voxel-based morphometry. A hypothesis-driven region of interest (ROI) approach was used, focusing on the basal ganglia, the amygdala-hippocampal complex, the prefrontal cortex, and the parietal cortex. SAD-patients had larger GM volume in the dorsal striatum when compared to HC-participants. This increase correlated positively with the severity of self-reported social anxiety symptoms. No SAD-related differences in GM volume were present in the other ROIs. Thereby, the results of this mega-analysis suggest a role for the dorsal striatum in SAD, but previously reported SAD-related changes in GM in the amygdala, hippocampus, precuneus, prefrontal cortex and parietal regions were not replicated. Our findings emphasize the importance of large sample imaging studies and the need for meta-analyses like those performed by the Enhancing NeuroImaging Genetics through Meta-Analysis (ENIGMA) Consortium.
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