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      • Department of Electrical and Electronics Engineering
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      Category-selective top-down modulation in the fusiform face area of the human brain during visual search

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      Author(s)
      Dar, Salman Ul Hassan
      Çukur, Tolga
      Date
      2017
      Source Title
      Proceedings of the IEEE 25th Signal Processing and Communications Applications Conference, SIU 2017
      Publisher
      IEEE
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      315
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      Abstract
      Several regions in the ventral-temporal cortex of the human brain are thought to have representations of specific categories of objects. Furthermore, a distributed network of frontal and parietal brain regions is implicated in attentional control. It is assumed that during visual search, attention-control regions send top-down signals to the target category-selective areas to bias the processing in favour of the attended object category. However, little is known about such causal interactions during naturalistic visual search. Here we assess the influence of attention-control brain regions on a well-known face selective area fusiform face area (FFA) during natural visual search using Granger causality analysis. Our results indicate that attending to humans enhances the influence of attention-control regions on the fusiform face area.
      Keywords
      Brain connectivity
      Category selectivity
      Functional MRI
      Granger causality
      Flood control
      Semiconducting indium gallium arsenide
      Statistical tests
      Attention control
      Distributed networks
      Granger causality analysis
      Functional neuroimaging
      Permalink
      http://hdl.handle.net/11693/37599
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/SIU.2017.7960222
      Collections
      • Aysel Sabuncu Brain Research Center (BAM) 249
      • Department of Electrical and Electronics Engineering 4012
      • National Magnetic Resonance Research Center (UMRAM) 301
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