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Sökning: WFRF:(Espeseth Thomas)

  • Resultat 21-25 av 25
  • Föregående 12[3]
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21.
  • Duarte Fernandes, Carla Patricia, et al. (författare)
  • Lack of association of the rs1344706 ZNF804A variant with cognitive functions and DTI indices of white matter microstructure in two independent healthy populations
  • 2014
  • Ingår i: Psychiatry Research. - : Elsevier. - 0925-4927 .- 1872-7506. ; 222:1-2, s. 60-66
  • Tidskriftsartikel (refereegranskat)abstract
    • The rs1344706 single nucleotide polymorphism with in intron 2 of the ZNF804A gene is strongly associated with schizophrenia and bipolar disorder. This variant has also been associated in some studies with a range of cognitive and neuro imaging phenotypes, but several studies have reported no effect on the same phenotypes in other samples. Here, we genotyped 670 healthy adult Norwegian subjects and 1753 healthy adult Swedish subjects for rs1344706, and tested for associations with cognitive phenotypes including general intellectual abilities, memory functions and cognitive inhibition. We also tested whether rs1344706 is associated with white matter microstructural properties using diffusion tensor imaging (DTI) data from 250 to 340 of the Norwegian and Swedish subjects, respectively. Whole-brain voxel-wise statistical modeling of the effect of the ZNF804A variant on two DTI indices, fractional anisotropy (FA) and radial diffusivity (RD), was performed using tract-based spatial statistics (TBSS), and commonly reported effect sizes were calculated within several large-scale white matter pathways based on neuroanatomic atlases. No significant associations were found between rs1344706 and the cognitive traits or white matter microstructure. We conclude that the rs1344706 SNP has no significant effect on these phenotypes in our two reasonably powered samples.
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22.
  • Myrum, Craig, et al. (författare)
  • Common variants in the ARC gene are not associated withcognitive abilities
  • 2015
  • Ingår i: Brain and Behavior. - : John Wiley & Sons. - 2162-3279 .- 2162-3279. ; 5:10
  • Tidskriftsartikel (refereegranskat)abstract
    • Introduction: The Activity-Regulated Cytoskeleton-associated (ARC) gene encodes a protein that is critical for the consolidation of synaptic plasticity and long-term memory formation. Given ARC's key role in synaptic plasticity, we hypothesized that genetic variations in ARC may contribute to interindividual variability in human cognitive abilities or to attention-deficit hyperactivity disorder (ADHD) susceptibility, where cognitive impairment often accompanies the disorder. Methods: We tested whether ARC variants are associated with six measures of cognitive functioning in 670 healthy subjects in the Norwegian Cognitive NeuroGenetics (NCNG) by extracting data from its Genome-Wide Association Study (GWAS). In addition, the Swedish Betula sample of 1800 healthy subjects who underwent similar cognitive testing was also tested for association with 19 tag SNPs. Results: No ARC variants show association at the study-wide level, but several markers show a trend toward association with human cognitive functions. We also tested for association between ARCSNPs and ADHD in a Norwegian sample of cases and controls, but found no significant associations. Conclusion: This study suggests that common genetic variants located in ARC do not account for variance in human cognitive abilities, though small effects cannot be ruled out.
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23.
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24.
  • Wehling, Eike Ines, et al. (författare)
  • Familiarity, cued and free odoridentification and their association with cognitive functioning in middleaged and older adults
  • 2010
  • Ingår i: Aging, Neuropsychology and Cognition. - : Psychology Press, Taylor and Francis Group. - 1382-5585 .- 1744-4128. ; 17:2, s. 205-219
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of the present study was to examine the association between familiarity of odors, cued and free odor identification performance and cognitive function in elderly adults. It was further investigated how age affects performance on the various odor tasks. A third aim was to investigate the role of familiarity in explaining performance on the free identification task. One hundred and thirty-six participants (aged 45–79  years) with normal olfactory sensitivity were assessed with the Scandinavian Odor Identification Test (SOIT) and standardized tests of cognitive function. Familiarity did not correlate with any measure of cognitive function, while verbal identification performance was associated with several cognitive measures, although correlations were modest. In this sample, free odor identification was affected by increasing age to a marginally larger extent than cued identification performance and familiarity ratings. The results suggest that the different olfactory tasks involve different levels of cognitive processing.
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25.
  • Wehling, Eike, et al. (författare)
  • Unawareness of olfactory dysfunction and its association with cognitive functioning in middle aged and old adults
  • 2011
  • Ingår i: Archives of clinical neuropsychology. - : Oxford University Press. - 0887-6177 .- 1873-5843. ; 26:3, s. 260-269
  • Tidskriftsartikel (refereegranskat)abstract
    • The objective of this study was (a) to investigate the accordance of self-reported and objectively assessed olfactory functioning and (b) to compare performance on cognitive tests of individuals unaware of their olfactory dysfunction with individuals aware of their olfactory status. Two hundred forty participants, constituting two age groups, were evaluated with the Scandinavian Odor Identification Test, a question of self-evaluated olfactory function, tests of cognitive function, and a memory questionnaire. The proportion of individuals being unaware of an olfactory dysfunction was high in both middle aged (86%) and old (78%) participants. Performance on neuropsychological tests showed that persons unaware of their olfactory dysfunction performed poorer on tests of verbal learning and memory and attention/processing speed compared to individuals aware of a normal olfactory status as well as individuals aware of their olfactory dysfunction. The clinical relevance of unawareness of olfactory dysfunction, as suggested earlier, needs further investigation and stresses the need of an extensive multi-modal and longitudinal assessment of unawareness of sensory and cognitive function to learn more about the facets of the concept of unawareness.
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  • Resultat 21-25 av 25
  • Föregående 12[3]
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