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Visual field and task influence illusory figure responses

ARAN - Access to Research at NUI Galway

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dc.contributor.author Elliott, Mark en
dc.date.accessioned 2011-01-11T15:59:53Z en
dc.date.available 2011-01-11T15:59:53Z en
dc.date.issued 2008-11 en
dc.identifier.citation Bakar, A. A., Liu, L., Conci, M., Elliott, M. A., & Ioannides, A. A. (2008). Visual field and task influence illusory figure responses. Human Brain Mapping, 29(11), 1313-1326. en
dc.identifier.issn 1097-0193 en
dc.identifier.uri http://hdl.handle.net/10379/1533 en
dc.description.abstract In normal viewing conditions, many objects are often hidden or occluded by others, therefore restricting the information that enters the eye. One ability that the human visual system has developed to compensate for this visual limitation is to relate the surrounding elements to globally interpret the whole scene. The appearance of illusory figures (IF) based on surrounding elements also relies on this similar function. In the present study, we hypothesized that different mechanisms may be used by the brain to process IF from the center and periphery of the visual field. We compared magnetoencephalographic responses to IFs presented at different parts of the visual field under three task loads. For central presentation, IF specific responses peaked first in V1/V2 (96¿101 ms), and then in the lateral occipital complex (LOC; 132¿141 ms), independent of task. For peripheral presentation, the relative modulation towards IF was markedly reduced in V1/V2 and LOC while prominent activation peaks now shifted to the Fusiform Gyrus (from 200 ms onwards). Additionally, the type of task influenced processing at early stages beginning in V1/V2 (87 ms). Our results show that retinal eccentricity plays a crucial role in IF processing: figural completion at the center of the visual field is achieved in an ¿automatic¿ and seemingly effortless fashion whereas peripheral stimulus locations necessitate higher-order object completion stages which rely more heavily on attentional demands. en
dc.format application/pdf en
dc.language.iso en en
dc.publisher Wiley en
dc.subject Psychology en
dc.subject Kanizsa en
dc.subject Magnetoencephalography en
dc.subject Magnetic field tomography (MFT) en
dc.subject Lateral occipital complex (LOC) en
dc.subject Fusiform gyrus en
dc.title Visual field and task influence illusory figure responses en
dc.type Article en
dc.local.publishedsource http://dx.doi.org/10.1002/hbm.20464 en
dc.description.peer-reviewed peer-reviewed en

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