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@ARTICLE{Nettekoven:845491,
      author       = {Nettekoven, Charlotte and Reck, Nicola and Goldbrunner,
                      Roland and Grefkes, Christian and Weiß Lucas, Carolin},
      title        = {{S}hort- and long-term reliability of language f{MRI}},
      journal      = {NeuroImage},
      volume       = {16},
      issn         = {1053-8119},
      address      = {Orlando, Fla.},
      publisher    = {Academic Press},
      reportid     = {FZJ-2018-02725},
      pages        = {215-225},
      year         = {2018},
      abstract     = {When using functional magnetic resonance imaging (fMRI) for
                      mapping important language functions, a high test-retest
                      reliability is mandatory, both in basic scientific research
                      and for clinical applications. We, therefore, systematically
                      tested the short- and long-term reliability of fMRI in a
                      group of healthy subjects using a picture naming task and a
                      sparse-sampling fMRI protocol. We hypothesized that
                      test-retest reliability might be higher for (i)
                      speech-related motor areas than for other language areas and
                      for (ii) the short as compared to the long intersession
                      interval.16 right-handed subjects (mean age: 29 years)
                      participated in three sessions separated by 2–6 (session 1
                      and 2, short-term) and 21–34 days (session 1 and 3,
                      long-term). Subjects were asked to perform the same overt
                      picture naming task in each fMRI session (50 black-white
                      images per session). Reliability was tested using the
                      following measures: (i) Euclidean distances (ED) between
                      local activation maxima and Centers of Gravity (CoGs), (ii)
                      overlap volumes and (iii) voxel-wise intraclass correlation
                      coefficients (ICCs). Analyses were performed for three
                      regions of interest which were chosen based on whole-brain
                      group data: primary motor cortex (M1), superior temporal
                      gyrus (STG) and inferior frontal gyrus (IFG).Our results
                      revealed that the activation centers were highly reliable,
                      independent of the time interval, ROI or hemisphere with
                      significantly smaller ED for the local activation maxima
                      (6.451.36 mm) as compared to the CoGs (8.032.01 mm). In
                      contrast, the extent of activation revealed rather low
                      reliability values with overlaps ranging from $24\%$ (IFG)
                      to $56\%$ (STG). Here, the left hemisphere showed
                      significantly higher overlap volumes than the right
                      hemisphere. Although mean ICCs ranged between poor (ICC<0.5)
                      and moderate (ICC 0.5–0.74) reliability, highly reliable
                      voxels (ICC>0.75) were found for all ROIs. Voxel-wise
                      reliability of the different ROIs was influenced by the
                      intersession interval.Taken together, we could show that,
                      despite of considerable ROI-dependent variations of the
                      extent of activation over time, highly reliable centers of
                      activation can be identified using an overt picture naming
                      paradigm.},
      cin          = {INM-3},
      ddc          = {610},
      cid          = {I:(DE-Juel1)INM-3-20090406},
      pnm          = {572 - (Dys-)function and Plasticity (POF3-572)},
      pid          = {G:(DE-HGF)POF3-572},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:29704615},
      UT           = {WOS:000433223700018},
      doi          = {10.1016/j.neuroimage.2018.04.050},
      url          = {https://juser.fz-juelich.de/record/845491},
}