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    Large crowding zones in peripheral vision for briefly presented stimuli

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    Tripathy_Journal_of_Vision_2014.pdf (482.0Kb)
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    Publication date
    2014-12
    Author
    Tripathy, Srimant P.
    Cavanagh, P.
    Bedell, H.E.
    Keyword
    Crowding; Peripheral vision; Spatial vision; Temporal vision; Lateral interactions
    Rights
    © 2014 The Association for Research in Vision and Ophthalmology, Inc. This work is licensed under a Creative Commons Attribution-Non-Commercial–No Derivatives License.
    Peer-Reviewed
    Yes
    
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    Abstract
    When a target is flanked by distractors, it becomes more difficult to identify. In the periphery, this crowding effect extends over a wide range of target-flanker separations, called the spatial extent of interaction (EoI). A recent study showed that the EoI dramatically increases in size for short presentation durations (Chung & Mansfield, 2009). Here we investigate this duration-EoI relation in greater detail and show that (a) it holds even when visibility of the unflanked target is equated for different durations, (b) the function saturates for durations shorter than 30 to 80 ms, and (c) the largest EoIs represent a critical spacing greater than 50% of eccentricity. We also investigated the effect of same or different polarity for targets and flankers across different presentation durations. We found that EoIs for target and flankers having opposite polarity (one white, the other black) show the same temporal pattern as for same polarity stimuli, but are smaller at all durations by 29% to 44%. The observed saturation of the EoI for shortduration stimuli suggests that crowding follows the locus of temporal integration. Overall, the results constrain theories that map crowding zones to fixed spatial extents or to lateral connections of fixed length in the cortex.
    URI
    http://hdl.handle.net/10454/10481
    Version
    Published version
    Citation
    Tripathy SP, Cavanagh P and Bedell HE (2014) Large crowding zones in peripheral vision for briefly presented stimuli. Journal of Vision. 14(6): Article 11.
    Link to publisher’s version
    http://dx.doi.org/10.1167/14.6.11
    Type
    Article
    Collections
    Life Sciences Publications

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