A preliminary evaluation of the human ERG obtained with sinusoidally varying light stimulation

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dc.contributor.advisorTroelstra, Arneen_US
dc.creatorDittert, Karen Kayen_US
dc.date.accessioned2018-12-18T21:23:04Zen_US
dc.date.available2018-12-18T21:23:04Zen_US
dc.date.issued1977en_US
dc.description.abstractThis thesis evaluates the human ERG obtained with sinusoidally varying light stimulation. Eighteen test frequencies are used, varying from 2 to Hz. The test is administered to both normals and patients with retinitis pigmentosa (R.F.) The output waveforms are subjected to a Pourier analysis, and the Fourier coefficients form the data base for a cluster analysis. The clustering methods have three main goals: 1) To automatically separate the normals and the R.P.'s, based on the Pourier coefficients, 2) To find groups among the R.P.'s based on these coefficients, and 3) To investigate these groups for a relationship with physiological or clinical variables that the ophthamologist measures. Three methods of clustering are employed: 1) The K-Keans algorithm, 2) A hierarchical method, and 3) Approximation of the frequency versus phase of the first harmonic graph. Normals are grouped correctly by all methods, while all but three R.P. eyes are separated as abnormal. The greatest correlation occurs with the flash ERG. The phase approach leads to the most promising results, and further research in this area is suggested.en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent137 ppen_US
dc.identifier.callnoTHESIS E.E. 1977 DITTERTen_US
dc.identifier.citationDittert, Karen Kay. "A preliminary evaluation of the human ERG obtained with sinusoidally varying light stimulation." (1977) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/104436">https://hdl.handle.net/1911/104436</a>.en_US
dc.identifier.digitalRICE2071en_US
dc.identifier.urihttps://hdl.handle.net/1911/104436en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleA preliminary evaluation of the human ERG obtained with sinusoidally varying light stimulationen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentElectrical Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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