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dc.contributor.authorPellicci, Joel Allan
dc.date.accessioned2021-01-25T07:15:29Z
dc.date.available2021-01-25T07:15:29Z
dc.date.issued2020
dc.identifier.urihttp://hdl.handle.net/11343/258815
dc.description© 2020 Joel Allan Pellicci
dc.description.abstractOptokinetic nystagmus (OKN) is a sequence of involuntary eye movements comprising slow phases of tracking a moving stimulus followed by fast saccades to reset the eye position. Although previous studies have studied the relationship between human OKN and functional vision via measurement of the contrast-sensitivity function (CSF), it has not been investigated using colour-varying, red-green, equiluminant patterns. In human vision, spatiotemporal changes in luminance convey a stronger sense of motion than do equiluminant patterns; yet, motion can nevertheless be perceived without luminance cues. The present study used spatial-frequency, band-pass luminance and red-green equiluminant noise patterns to measure OKN, and thus characterise the chromatic input to the mechanisms that drive the optokinetic response. The CSFs of 21 observers with normal vision were recorded using OKN and perceptual report. The results of the study demonstrate that an equiluminant red green stimulus can evoke a robust OKN response. There was a high correlation between OKN and perceptual report, for both luminance and colour stimuli, an indication of a common neural mechanism for defining stimulus direction. In all stimulus conditions tested, OKN can deliver a valid alternate technique for measuring the CSF.
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dc.subjectOptokinetic Nystagmus
dc.subjectContrast Sensitivity
dc.subjectPsychophysics
dc.subjectColour
dc.subjectMotion
dc.titleChromatic contrast sensitivity functions measured using optokinetic nystagmus and psychophysics
dc.typeMasters Research thesis
melbourne.affiliation.departmentMelbourne School of Psychological Sciences
melbourne.affiliation.facultyMedicine, Dentistry & Health Sciences
melbourne.thesis.supervisornameJason Forte
melbourne.contributor.authorPellicci, Joel Allan
melbourne.thesis.supervisorothernameSimon Cropper
melbourne.thesis.supervisorothernamePatrick Goodbourn
melbourne.tes.fieldofresearch1520406 Sensory processes, perception and performance
melbourne.tes.fieldofresearch2529999 Other psychology not elsewhere classified
melbourne.accessrightsOpen Access


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