Large crowding zones in peripheral vision for briefly presented stimuli

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dc.contributor.authorTripathy, Srimant P.
dc.contributor.authorCavanagh, Patrick
dc.contributor.authorBedell, Harold E.
dc.date.accessioned2017-12-06T22:28:28Z
dc.date.available2017-12-06T22:28:28Z
dc.date.issued2014-12
dc.description.abstractWhen 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 short-duration 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.
dc.description.departmentVision Sciences
dc.identifier10.1167/14.6.11
dc.identifier.citationCopyright 2014 Journal of Vision. Recommended citation: Tripathy, Srimant Prasad, Patrick Cavanagh, and Harold E. Bedell. "Large crowding zones in peripheral vision for briefly presented stimuli." Journal of Vision 14, no. 6 (2014): 11-11. doi: 10.1167/14.6.11. URL: http://jov.arvojournals.org/article.aspx?articleid=2212998. Reproduced in accordance with licensing terms and with author permission.
dc.identifier.urihttp://hdl.handle.net/10657/2063
dc.language.isoen_US
dc.publisherJournal of Vision
dc.titleLarge crowding zones in peripheral vision for briefly presented stimuli
dc.typeArticle

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