Adaptive changes of inner retina function in response to sustained pattern stimulation.

Vision Research
Vittorio Porciatti, Lori M Ventura

Abstract

We have characterized adaptive changes of inner retina function in response to sustained pattern stimulation in 32 normal subjects with an age range 23-77 years by measuring changes of the pattern electroretinogram (PERG) as a function of time. Contrast-reversal stimuli had square-wave profile in space and time, with peak spatial and temporal frequency and high contrast to maximize response amplitude. The PERG signal was sampled over 5min with a resolution of 15s. PERG signals were non-stationary, resulting in either progressive amplitude decline or even enhancement to a plateau, with a time course that could be well described by an exponential function with a time constant of 1-2min. Higher initial amplitudes were generally associated with amplitude decline, and lower initial amplitudes with enhancement. The delta amplitude (plateau minus initial) was a linear function of the initial amplitude. The magnitude of delta decreased with decreasing initial amplitude and inverted its sign for initial amplitudes about 1/3 lower than the maximum initial amplitude measured, but still about 3-4 times larger than the noise. Amplitude decline was generally associated with phase lag, whereas amplitude enhancement was associated with phase a...Continue Reading

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Citations

Feb 23, 2013·Journal of Glaucoma·Vittorio PorciattiLori M Ventura
Jan 29, 2013·Journal of Glaucoma·Konstantinos T TsaousisEfstathios T Detorakis
Jul 15, 2015·BioMed Research International·Alberto MavilioDonato Errico
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May 21, 2018·Documenta Ophthalmologica. Advances in Ophthalmology·P MonsalveV Porciatti
Nov 19, 2019·Current Ophthalmology Reports·Pedro Monsalve
Jan 25, 2020·Journal of Neuro-ophthalmology : the Official Journal of the North American Neuro-Ophthalmology Society·Hong JiangJianhua Wang
May 19, 2021·Translational Vision Science & Technology·Diego AlbaVittorio Porciatti

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