Oscillatory potentials as predictors to amplitude and peak time of the photopic b-wave of the human electroretinogram |
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Authors: | Dr Pierre Lachapelle |
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Institution: | (1) Department of Ophthalmology, McGill University and Montreal Children's Hospital Research Institute, H3H 1P3 Montreal, Quebec, Canada;(2) Dept. of Ophthalmology, The Montreal Children's Hospital, 2300 Tupper Street, H3H 1P3 Montreal, Quebec, Canada |
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Abstract: | The oscillatory potentials are viewed by many as small oscillations of a highfrequency domain that ride on the b-wave of the electroretinogram. A study of electroretinograms and oscillatory potentials performed in 25 normal subjects was undertaken to substantiate my claim that oscillatory potentials are fast retinal potentials that are integrated to form the b-wave. The prominence of the OPs on the ascending limb of the b-wave was found to be only weakly correlated (r = –0.37) to the amplitude of the oscillatory potentials (measured in the 100–1000 Hz recordings). There was, however, a high correlation (r = 0.78) between the prominence of the oscillatory potentials and their frequency domain as determined by the peak-to-peak timing. Furthermore, the peak-to-peak timing of the oscillatory potentials was highly correlated with the b-wave peak time (r = 0.86) as well as with the a-wave trough to b-wave peak time (r = 0.90), while the amplitude of the oscillatory potentials was correlated to the amplitude of the b-wave (r = 0.78). Interestingly, when combining the amplitude of the oscillatory potentials with the time interval between oscillatory potentials 2 and 3 and 3 and 4, a higher correlation (r = 0.88) was found with the b-wave amplitude. The latter finding would support my claim that the b-wave represents an integration (amplitude as a function of time) of the oscillatory potentials. |
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Keywords: | amplitude electroretinogram frequency oscillatory potentials photopic |
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