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Campo DCValorIdioma
dc.contributor.authorSilva, Ana C.por
dc.contributor.authorMcMillan, Glyn A.por
dc.contributor.authorSantos, Cristinapor
dc.contributor.authorGray, John R.por
dc.date.accessioned2018-03-12T09:08:00Z-
dc.date.issued2015-
dc.identifier.issn0022-3077por
dc.identifier.urihttps://hdl.handle.net/1822/52020-
dc.description.abstractAn increasing number of studies show how stimulus complexity affects the responses of looming-sensitive neurons across multiple animal taxa. Locusts contain a well-described, descending motion-sensitive pathway that is preferentially looming sensitive. However, the lobula giant movement detector/descending contralateral movement detector (LGMD/DCMD) pathway responds to more than simple objects approaching at constant, predictable trajectories. In this study, we presented Locusta migratoria with a series of complex three-dimensional visual stimuli presented while simultaneously recording DCMD activity extracellularly. In addition to a frontal looming stimulus, we used a combination of compound trajectories (nonlooming transitioning to looming) presented at different velocities and onto a simple, scattered, or progressive flow field background. Regardless of stimulus background, DCMD responses to looming were characteristic and related to previously described effects of azimuthal approach angle and velocity of object expansion. However, increasing background complexity caused reduced firing rates, delayed peaks, shorter rise phases, and longer fall phases. DCMD responded to transitions to looming with a characteristic drop in a firing rate that was relatively invariant across most stimulus combinations and occurred regardless of stimulus background. Spike numbers were higher in the presence of the scattered background and reduced in the flow field background. We show that DCMD response time to a transition depends on unique expansion parameters of the moving stimulus irrespective of background complexity. Our results show how background complexity shapes DCMD responses to looming stimuli, which is explained within a behavioral context.por
dc.description.sponsorshipFunding was provided by the National Sciences and Engineering Research Council (NSERC) of Canada, the Canada Foundation for Innovation (CFI), and the University of Saskatchewan. This work was also supported by Fundacao para a Ciencia e Tecnologia (FCT) within the Project Scope PEst OE/EEI/UI0319/2014. A. C. Silva is supported by PhD Grant SFRH/BD/70396/2010.por
dc.language.isoengpor
dc.publisherAmerican Physiological Societypor
dc.relationinfo:eu-repo/grantAgreement/FCT/5876/135968/PTpor
dc.relationinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F70396%2F2010/PTpor
dc.rightsrestrictedAccesspor
dc.subjectvisonpor
dc.subjectoptic flowpor
dc.subjectloomingpor
dc.subjectLocusta migratoriapor
dc.subjectdescending contralateral movement detectorpor
dc.titleBackground complexity affects response of a looming-sensitive neuron to object motionpor
dc.typearticle-
dc.peerreviewedyespor
oaire.citationStartPage218por
oaire.citationEndPage231por
oaire.citationIssue1por
oaire.citationVolume113por
dc.date.updated2018-03-09T15:46:11Z-
dc.identifier.doi10.1152/jn.00478.2014por
dc.identifier.pmid25274344-
dc.description.publicationversioninfo:eu-repo/semantics/publishedVersionpor
dc.subject.wosScience & Technology-
sdum.export.identifier4349-
sdum.journalJournal of Neurophysiologypor
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