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      • Department of Electrical and Electronics Engineering
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      Functional subdomains within human FFA

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      Author
      Çukur, T.
      Huth, A. G.
      Nishimoto, S.
      Gallant, J. L.
      Date
      2013
      Source Title
      Journal of Neuroscience
      Print ISSN
      0270-6474
      Publisher
      Society for Neuroscience
      Volume
      33
      Issue
      42
      Pages
      16748 - 16766
      Language
      English
      Type
      Article
      Item Usage Stats
      101
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      72
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      Abstract
      The fusiform face area (FFA) is a well-studied human brain region that shows strong activation for faces. In functional MRI studies, FFA is often assumed to be a homogeneous collection of voxels with similar visual tuning. To test this assumption, we used natural movies and a quantitative voxelwise modeling and decoding framework to estimate category tuning profiles for individual voxels within FFA. We find that the responses in most FFA voxels are strongly enhanced by faces, as reported in previous studies. However, we also find that responses of individual voxels are selectively enhanced or suppressed by a wide variety of other categories and that these broader tuning profiles differ across FFA voxels. Cluster analysis of category tuning profiles across voxels reveals three spatially segregated functional subdomains within FFA. These subdomains differ primarily in their responses for nonface categories, such as animals, vehicles, and communication verbs. Furthermore, this segregation does not depend on the statistical threshold used to define FFA from responses to functional localizers. These results suggest that voxels within FFA represent more diverse information about object and action categories than generally assumed. © 2013 the authors.
      Keywords
      Adult
      Brain Mapping
      Female
      Functional Neuroimaging
      Humans
      Image Processing, Computer-Assisted
      Magnetic Resonance Imaging
      Male
      Occipital Lobe
      Pattern Recognition, Visual
      Photic Stimulation
      Temporal Lobe
      Visual Perception
      Permalink
      http://hdl.handle.net/11693/20752
      Published Version (Please cite this version)
      http://dx.doi.org/10.1523/JNEUROSCI.1259-13.2013
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      • Department of Electrical and Electronics Engineering 3524
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