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      • Faculty of Economics, Administrative And Social Sciences
      • Department of Psychology
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      Attention modulates neuronal correlates of interhemispheric integration and global motion perception

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      Author
      Akin, B.
      Ozdem, C.
      Eroglu, S.
      Keskin, D. T.
      Fang, F.
      Doerschner, Katja
      Kersten, D.
      Boyacı, Hüseyin
      Date
      2014
      Source Title
      Journal of Vision
      Electronic ISSN
      1534-7362
      Publisher
      Association for Research in Vision and Ophthalmology Inc.
      Volume
      14
      Issue
      12
      Pages
      1 - 13
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      In early retinotopic areas of the human visual system, information from the left and right visual hemifields (VHFs) is processed contralaterally in two hemispheres. Despite this segregation, we have the perceptual experience of a unified, coherent, and uninterrupted single visual field. How exactly the visual system integrates information from the two VHFs and achieves this perceptual experience still remains largely unknown. In this study using fMRI, we explored candidate areas that are involved in interhemispheric integration and the perceptual experience of a unified, global motion across VHFs. Stimuli were two-dimensional, computergenerated objects with parts in both VHFs. The retinal image in the left VHF always remained stationary, but in the experimental condition, it appeared to have local motion because of the perceived global motion of the object. This perceptual effect could be weakened by directing the attention away from the global motion through a demanding fixation task. Results show that lateral occipital areas, including the medial temporal complex, play an important role in the process of perceptual experience of a unified global motion across VHFs. In early areas, including the lateral geniculate nucleus and V1, we observed correlates of this perceptual experience only when attention is not directed away from the object. These findings reveal effects of attention on interhemispheric integration in motion perception and imply that both the bilateral activity of higher-tier visual areas and feedback mechanisms leading to bilateral activity of early areas play roles in the perceptual experience of a unified visual field.
      Permalink
      http://hdl.handle.net/11693/26410
      Published Version (Please cite this version)
      http://dx.doi.org/10.1167/14.12.30
      Collections
      • Aysel Sabuncu Brain Research Center (BAM) 197
      • Department of Psychology 170
      • National Magnetic Resonance Research Center (UMRAM) 197
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