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Träfflista för sökning "WFRF:(Andreassen O. A.) srt2:(2006-2009)"

Sökning: WFRF:(Andreassen O. A.) > (2006-2009)

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  • Ousdal, O T, et al. (författare)
  • The human amygdala is involved in general behavioral relevance detection : evidence from an event-related functional magnetic resonance imaging Go-NoGo task.
  • 2008
  • Ingår i: Neuroscience. - 0306-4522 .- 1873-7544. ; 156:3, s. 450-455
  • Tidskriftsartikel (refereegranskat)abstract
    • The amygdala is classically regarded as a detector of potential threat and as a critical component of the neural circuitry mediating conditioned fear responses. However, it has been reported that the human amygdala responds to multiple expressions of emotions as well as emotionally neutral stimuli of a novel, uncertain or ambiguous nature. Thus, it has been proposed that the function of the amygdala may be of a more general art, i.e. as a detector of behaviorally relevant stimuli [Sander D, Grafman J, Zalla T (2003) The human amygdala: an evolved system for relevance detection. Rev Neurosci 14:303-316]. To investigate this putative function of the amygdala, we used event related functional magnetic resonance imaging (fMRI) and a modified Go-NoGo task composed of behaviorally relevant and irrelevant letter and number stimuli. Analyses revealed bilateral amygdala activation in response to letter stimuli that were behaviorally relevant as compared with letters with less behavioral relevance. Similar results were obtained for relatively infrequent NoGo relevant stimuli as compared with more frequent Go stimuli. Our findings support a role for the human amygdala in general detection of behaviorally relevant stimuli.
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  • Helgeland, A., et al. (författare)
  • Visualization of vorticity and vortices in wall-bounded turbulent flows
  • 2007
  • Ingår i: IEEE Transactions on Visualization and Computer Graphics. - 1941-0506 .- 1077-2626. ; 13:5, s. 1055-1066
  • Tidskriftsartikel (refereegranskat)abstract
    • This study was initiated by the scientifically interesting prospect of applying advanced visualization techniques to gain further insight into various spatio-temporal characteristics of turbulent flows. The ability to study complex kinematical and dynamical features of turbulence provides means of extracting the underlying physics of turbulent fluid motion. The objective is to analyze the use of a vorticity field line approach to study numerically generated incompressible turbulent flows. In order to study the vorticity field, we present a field line animation technique that uses a specialized particle advection and seeding strategy. Efficient analysis is achieved by decoupling the rendering stage from the preceding stages of the visualization method. This allows interactive exploration of multiple fields simultaneously, which sets the stage for a more complete analysis of the flow field. Multifield visualizations are obtained using a flexible volume rendering framework, which is presented in this paper. Vorticity field lines have been employed as indicators to provide a means to identify "ejection" and "sweep" regions, two particularly important spatio-temporal events in wall-bounded turbulent flows. Their relation to the rate of turbulent kinetic energy production and viscous dissipation, respectively, has been identified.
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