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A magnocellular contribution to conscious perception via temporal object segmentation

Goodhew, Stephanie Catherine; Boal, Hannah L; Edwards, M

Description

The human visual system is continuously confronted with dynamic visual input. One challenge that the visual system must solve, therefore, is recognizing when two distinct objects have appeared at a given location despite their brief presentation and rapid succession, that is, temporal object segmentation. Here we examined the role of magnocellular neurons in this process. We measured temporal object segmentation via object substitution masking (OSM), which reflects the failure to distinguish...[Show more]

dc.contributor.authorGoodhew, Stephanie Catherine
dc.contributor.authorBoal, Hannah L
dc.contributor.authorEdwards, M
dc.date.accessioned2014-02-17T02:30:25Z
dc.date.available2014-02-17T02:30:25Z
dc.identifier.citationGoodhew, S. C., Boal, H. L., & Edwards, M. (2014). A magnocellular contribution to conscious perception via temporal object segmentation. Journal of Experimental Psychology: Human Perception and Performance, 40(3), 948-959. http://dx.doi.org/10.1037/a0035769
dc.identifier.issn0096-1523
dc.identifier.urihttp://hdl.handle.net/1885/11346
dc.description.abstractThe human visual system is continuously confronted with dynamic visual input. One challenge that the visual system must solve, therefore, is recognizing when two distinct objects have appeared at a given location despite their brief presentation and rapid succession, that is, temporal object segmentation. Here we examined the role of magnocellular neurons in this process. We measured temporal object segmentation via object substitution masking (OSM), which reflects the failure to distinguish the target and mask as distinct objects through time. We isolated the selective role of magnocellular neurons by comparing performance under conditions of pulsed luminance pedestals, which are designed to saturate the magnocellular response, with that in a steady-pedestal condition that leaves both magnocellular and parvocellular channels available to process the target. Across two experiments, we found that OSM magnitude was enhanced under pulsed-pedestal conditions, in which the magnocellular response was impaired. This indicates that magnocellular neurons contribute to temporal object segmentation. Given that temporal object segmentation has consequences for which stimuli are consciously perceived, this demonstrates a functional mechanism via which magnocellular neurons contribute to determining the contents conscious perception. Implications for models of specialization of dorsal and ventral cortical streams are discussed.
dc.description.sponsorshipDiscovery Early Career Researcher Award - Grant ID: DE140101734 [ 2014 - 2016 ]
dc.publisherAmerican Psychological Association
dc.rightsAuthors of articles published in APA journals may post a copy of the final manuscript, as accepted for publication... in their institution's repository after it is accepted for publication. From publishers website,http://www.apa.org/pubs/authors/posting.aspx, 17/2/14
dc.sourceJournal of Experimental Psychology: Human Perception and Performance
dc.source.urihttp://www.apa.org/pubs/journals/xhp/
dc.subjectmagnocellular
dc.subjectdorsal stream
dc.subjectluminance pedestal
dc.subjecttemporal object segmentation
dc.subjectvisual masking
dc.subjectconscious perception
dc.subjectsimultanagnosia
dc.titleA magnocellular contribution to conscious perception via temporal object segmentation
dc.typeJournal article
local.identifier.citationvolume40
dc.date.issued2014-02-03
local.identifier.absfor170112 - Sensory Processes, Perception and Performance
local.identifier.ariespublicationU3488905xPUB2444
local.publisher.urlhttp://www.apa.org/index.aspx
local.type.statusAccepted Version
local.contributor.affiliationGoodhew, S C, Department of Psychology, Australian National University
dc.relationhttp://purl.org/au-research/grants/arc/DE140101734
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage948
local.bibliographicCitation.lastpage959
local.identifier.doi10.1037/a0035769
local.identifier.absseo920204 - Evaluation of Health Outcomes
dc.date.updated2015-12-11T07:26:05Z
local.identifier.scopusID2-s2.0-84901606251
local.identifier.thomsonID000336786900008
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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