Attention modulates neuronal correlates of interhemispheric integration and global motion perception

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buir.contributor.authorDoerschner, Katja
buir.contributor.authorBoyacı, Hüseyin
dc.citation.epage13en_US
dc.citation.issueNumber12en_US
dc.citation.spage1en_US
dc.citation.volumeNumber14en_US
dc.contributor.authorAkin, B.en_US
dc.contributor.authorOzdem, C.en_US
dc.contributor.authorEroglu, S.en_US
dc.contributor.authorKeskin, D. T.en_US
dc.contributor.authorFang, F.en_US
dc.contributor.authorDoerschner, Katjaen_US
dc.contributor.authorKersten, D.en_US
dc.contributor.authorBoyacı, Hüseyinen_US
dc.date.accessioned2016-02-08T10:59:25Z
dc.date.available2016-02-08T10:59:25Z
dc.date.issued2014en_US
dc.departmentDepartment of Psychologyen_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.departmentAysel Sabuncu Brain Research Center (BAM)en_US
dc.description.abstractIn 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.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T10:59:25Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2014en
dc.identifier.doi10.1167/14.12.30en_US
dc.identifier.eissn1534-7362
dc.identifier.urihttp://hdl.handle.net/11693/26410
dc.language.isoEnglishen_US
dc.publisherAssociation for Research in Vision and Ophthalmology Inc.en_US
dc.relation.isversionofhttp://dx.doi.org/10.1167/14.12.30en_US
dc.source.titleJournal of Visionen_US
dc.titleAttention modulates neuronal correlates of interhemispheric integration and global motion perceptionen_US
dc.typeArticleen_US

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