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dc.contributor.authorWaddington, J
dc.contributor.authorHarris, Chris
dc.date.accessioned2016-06-02T11:54:03Z
dc.date.available2016-06-02T11:54:03Z
dc.date.issued2015-09-18
dc.identifier.issn1534-7362
dc.identifier.issn1534-7362
dc.identifier.otherARTN 7
dc.identifier.urihttp://hdl.handle.net/10026.1/4790
dc.description.abstract

Optokinetic nystagmus (OKN) is a fundamental oculomotor response to retinal slip generated during natural movement through the environment. The timing and amplitude of the compensatory slow phases (SPs) alternating with saccadic quick phases (QPs) are remarkably variable, producing a characteristic irregular sawtooth waveform. We have previously found three stochastic processes that underlie OKN: the processes that determine QP and SP amplitude and the update dynamics of SP velocity. SP and QP parameters are interrelated and dependent on SP velocity such that changes in stimulus speed can have a seemingly complex effect on the nystagmus waveform. In this study we investigated the effect of stimulus spatial frequency on the stochastic processes of OKN. We found that increasing the spatial frequency of suprathreshold stimuli resulted in a significant increase in SP velocity with a corresponding reduction in retinal slip. However, retinal slip rarely reached values close to 0, indicating that the OKN system does not or cannot always minimize retinal slip. We deduce that OKN gain must be less than unity if extraretinal gain is lower than unity (as empirically observed), and that the difference between retinal and extraretinal gain determines the Markov properties of SP velocity. As retinal gain is reduced with stimuli of lower spatial frequency, the difference between retinal and extraretinal gain increases and the Markov properties of the system can be observed.

dc.format.extent7-7
dc.format.mediumPrint
dc.languageen
dc.language.isoeng
dc.publisherAssociation for Research in Vision and Ophthalmology (ARVO)
dc.subjectoptokinetic nystagmus
dc.subjectspatial frequency
dc.subjectMarkov process
dc.subjectretinal gain
dc.subjectextraretinal gain
dc.titleHuman optokinetic nystagmus and spatial frequency
dc.typejournal-article
dc.typeJournal Article
dc.typeResearch Support, Non-U.S. Gov't
plymouth.author-urlhttps://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000368251200007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=11bb513d99f797142bcfeffcc58ea008
plymouth.issue13
plymouth.volume15
plymouth.publication-statusPublished
plymouth.journalJournal of Vision
dc.identifier.doi10.1167/15.13.7
plymouth.organisational-group/Plymouth
plymouth.organisational-group/Plymouth/Faculty of Health
plymouth.organisational-group/Plymouth/Research Groups
plymouth.organisational-group/Plymouth/Research Groups/Centre for Brain, Cognition and Behaviour (CBCB)
plymouth.organisational-group/Plymouth/Research Groups/Centre for Brain, Cognition and Behaviour (CBCB)/Brain
plymouth.organisational-group/Plymouth/Users by role
dc.publisher.placeUnited States
dc.identifier.eissn1534-7362
dc.rights.embargoperiodNot known
rioxxterms.versionofrecord10.1167/15.13.7
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review
plymouth.oa-locationhttp://arvojournals.org/data/Journals/JOV/934452/i1534-7362-15-13-7.pdf?resultClick=1


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