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@ARTICLE{Heim:5705,
      author       = {Heim, S. and Eickhoff, S. B. and Amunts, K.},
      title        = {{D}ifferent roles of cytoarchitectonic {BA}44 and {BA}45 in
                      phonological and semantic verbal fluency as revealed by
                      dynamic causal modelling},
      journal      = {NeuroImage},
      volume       = {48},
      issn         = {1053-8119},
      address      = {Orlando, Fla.},
      publisher    = {Academic Press},
      reportid     = {PreJuSER-5705},
      pages        = {616 - 624},
      year         = {2009},
      note         = {This Human Brain Project/Neuroinformatics research is
                      funded by the National Institute of Biomedical Imaging and
                      Bioengineering, the National Institute of Neurological
                      Disorders and Stroke, and the National Institute of Mental
                      Health (KA). Further support by the Brain Imaging Center
                      West (BMBF 01GO0204) is gratefully acknowledged. We thank N.
                      Jon Shah for the support of the NMR group at the INB-3
                      during fMRI data acquisition, in particular Barbara
                      Elghahwagi for her assistance with fMRI data recording.
                      Moreover, we appreciate the support by the Cognitive
                      Neurology group at the INB-3, in particular by Ralph
                      Weidner, Shahram Mirzazade, and Marcus Wilms, with respect
                      to the peripheral stimulation devices.},
      abstract     = {The interactions of left cytoarchitectonic BA 44 and BA 45
                      during semantic and phonological verbal fluency tasks were
                      investigated using dynamic causal modelling (DCM). Three
                      different models were tested, all of which featured BA 44
                      and BA 45 as top-down driven interconnected nodes projecting
                      to the motor cortex as the final output region. Model #1
                      represents the hypothesis that BA 45 is involved in lexical
                      retrieval including both semantic and phonological
                      processes, while BA 44 supports other phonological
                      processes. Model #2 reflects the notion of a clear-cut
                      segregation of computational processes sustained by BA 44
                      (phonological processing) and BA 45 (semantic processing).
                      Model #3 was based on the hypothesis that both BA 44 and BA
                      45 support semantic and phonological processing. When these
                      models were compared against each other by Bayesian model
                      selection, evidence emerged in favour of the first model,
                      implying that BA 45 supports word retrieval processes
                      whereas BA 44 is involved in processing phonological
                      information during word generation. In a subsequent analysis
                      of the derived model parameters for model #1, all connection
                      strengths were significantly positive except for the
                      inhibitory coupling between BA 44 and BA 45. This inhibition
                      may reflect how the phonological analysis in BA 44 during
                      word generation constrains lexical word retrieval in BA 45.
                      To conclude, DCM provided additional insights into the roles
                      of BA 44 and BA 45 during verbal fluency revealing the
                      involvement of BA 45 in lexical retrieval and the relevance
                      of BA 44 for phonological processing during word
                      generation.},
      keywords     = {Adult / Bayes Theorem / Computer Simulation / Female /
                      Frontal Lobe: physiology / Humans / Language / Language
                      Tests / Linear Models / Linguistics / Magnetic Resonance
                      Imaging / Male / Mental Processes: physiology / Models,
                      Neurological / Motor Cortex: physiology / Neural Inhibition
                      / Neural Pathways: physiology / Phonetics / Psychomotor
                      Performance: physiology / Speech: physiology / J (WoSType)},
      cin          = {INM-2 / INM-1 / JARA-BRAIN},
      ddc          = {610},
      cid          = {I:(DE-Juel1)INM-2-20090406 / I:(DE-Juel1)INM-1-20090406 /
                      $I:(DE-82)080010_20140620$},
      pnm          = {Funktion und Dysfunktion des Nervensystems},
      pid          = {G:(DE-Juel1)FUEK409},
      shelfmark    = {Neurosciences / Neuroimaging / Radiology, Nuclear Medicine
                      $\&$ Medical Imaging},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:19560543},
      pmc          = {pmc:PMC2770255},
      UT           = {WOS:000274724000014},
      doi          = {10.1016/j.neuroimage.2009.06.044},
      url          = {https://juser.fz-juelich.de/record/5705},
}