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Line Orientation Adaptation: Local or Global?

Gheorghiu, Elena; Bell, Jason; Kingdom, Frederick A. A.

Description

Prolonged exposure to an oriented line shifts the perceived orientation of a subsequently observed line in the opposite direction, a phenomenon known as the tilt aftereffect (TAE). Here we consider whether the TAE for line stimuli is mediated by a mechanism that integrates the local parts of the line into a single global entity prior to the site of adaptation, or the result of the sum of local TAEs acting separately on the parts of the line. To test between these two alternatives we used the...[Show more]

dc.contributor.authorGheorghiu, Elena
dc.contributor.authorBell, Jason
dc.contributor.authorKingdom, Frederick A. A.
dc.date.accessioned2015-11-24T05:45:15Z
dc.date.available2015-11-24T05:45:15Z
dc.identifier.issn1932-6203
dc.identifier.urihttp://hdl.handle.net/1885/16667
dc.description.abstractProlonged exposure to an oriented line shifts the perceived orientation of a subsequently observed line in the opposite direction, a phenomenon known as the tilt aftereffect (TAE). Here we consider whether the TAE for line stimuli is mediated by a mechanism that integrates the local parts of the line into a single global entity prior to the site of adaptation, or the result of the sum of local TAEs acting separately on the parts of the line. To test between these two alternatives we used the fact the TAE transfers almost completely across luminance contrast polarity [1]. We measured the TAE using adaptor and test lines that (1) either alternated in luminance polarity or were of a single polarity, and (2) either alternated in local orientation or were of a single orientation. We reasoned that if the TAE was agnostic to luminance polarity and was parts-based, we should obtain large TAEs using alternating-polarity adaptors with single-polarity tests. However we found that (i) TAEs using one-alternating-polarity adaptors with all-white tests were relatively small, increased slightly for two-alternating-polarity adaptors, and were largest with all-white or all-black adaptors. (ii) however TAEs were relatively large when the test was one-alternating polarity, irrespective of the adaptor type. (iii) The results with orientation closely mirrored those obtained with polarity with the difference that the TAE transfer across orthogonal orientations was weak. Taken together, our results demonstrate that the TAE for lines is mediated by a global shape mechanism that integrates the parts of lines into whole prior to the site of orientation adaptation. The asymmetry in the magnitude of TAE depending on whether the alternating-polarity lines was the adaptor or test can be explained by an imbalance in the population of neurons sensitive to 1(st)-and 2(nd)-order lines, with the 2(nd)-order lines being encoded by a subset of the mechanisms sensitive to 1(st)-order lines.
dc.description.sponsorshipThis research was supported by a Natural Sciences and Engineering Research Council of Canada (NSERC) grant #RGPIN 121713-11 given to FK and Australian Research Council grant DP110101511 to JB. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
dc.publisherPublic Library of Science
dc.rights© 2013 Gheorghiu et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
dc.sourcePLoS ONE
dc.subjectadaptation, ocular
dc.subjectcontrast sensitivity
dc.subjectfigural aftereffect
dc.subjecthumans
dc.subjectmodels, neurological
dc.subjectorientation
dc.subjectphotic stimulation
dc.titleLine Orientation Adaptation: Local or Global?
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume8
dc.date.issued2013-08-30
local.identifier.absfor170112
local.identifier.ariespublicationf5625xPUB3837
local.type.statusPublished Version
local.contributor.affiliationGheorghiu, Elena, University of Stirling, United Kingdom
local.contributor.affiliationBell, Jason, College of Medicine, Biology and Environment, CMBE Research School of Psychology, School of Psychology, The Australian National University
local.contributor.affiliationKingdom, Frederick A A, McGill University, Canada
dc.relationhttp://purl.org/au-research/grants/arc/DP110101511
local.identifier.essn1932-6203
local.bibliographicCitation.issue8
local.bibliographicCitation.startpagee73307
local.bibliographicCitation.lastpage11
local.identifier.doi10.1371/journal.pone.0073307
local.identifier.absseo970117
dc.date.updated2015-12-11T08:28:16Z
local.identifier.scopusID2-s2.0-84883385260
local.identifier.thomsonID000323880200073
CollectionsANU Research Publications

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