Search results for " photoreceptoral response"

showing 3 items of 3 documents

Wavelet analysis of human photoreceptoral response

2010

Feature detection of biomedical signals is crucial for deepening our knowledge of the physiological phenomena giving rise to them. To achieve this aim, even if many analytic approaches have been suggested only few are able to deal with signals whose features are time dependent, and to provide useful clinical information. In this work we use the wavelet analysis to extract peculiarities of the early response of the photoreceptoral human system, known as a-wave ERG-component. The analysis of the a-wave features is important since this component reflects the functional integrity of the two populations of photoreceptors, rods and cones whose activation dynamics are not well known. Moreover, in …

Congenital stationary night blindnessAchromatopsiagenetic structuresmedicine.diagnostic_testbusiness.industryWavelet analysis photoreceptoral response Achromatopsia Congenital Stationary Night Blindness.Wavelet transformFeature detection (nervous system)BiologyNeurophysiologymedicine.diseaseSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Time–frequency analysisWaveletmedicineComputer visionsense organsArtificial intelligencebusinessNeuroscienceElectroretinography2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010)
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An approach based on wavelet analysis for feature extraction in the electroretinogram

2011

Most biomedical signals are non-stationary. The knowledge of their frequency content and temporal distribution is then useful in a clinical context. The wavelet analysis is appropriate to achieve this task. The present paper uses this method to reveal hidden characteristics and anomalies of the human a-wave, an important component of the electroretinogram since it is a measure of the functional integrity of the photoreceptors. We here analyse the time–frequency features of the a-wave both in normal subjects and in patients affected by Achromatopsia, a pathology disturbing the functionality of the cones. The results indicate the presence of two or three stable frequencies that, in the pathol…

Electroretinogram a-Wave Photoreceptoral response Achromatopsia Wavelet analysisSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)
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ERG signal analysis using wavelet transform

2009

The wavelet analysis is a powerful tool for analyzing and detecting features of signals characterized by time-dependent statistical properties, as biomedical signals. The identification and the analysis of the components of these signals in the time-frequency domain, give meaningful information about the physiological mechanisms that govern them. This article presents the results of the wavelet analysis applied to the a-wave component of the human electroretinogram. In order to deepen and improve our knowledge about the behavior of the early photoreceptoral response, including the possible activation of interactions and correlations among the photoreceptors, we have detected and identified …

Statistics and ProbabilitySignal processingComputer scienceApplied MathematicsWavelet AnalysisMexican hat waveletWavelet transformLuminanceRetinaSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Electroretinogram – a-wave – Photoreceptoral response – Wavelet analysis – Mexican hat waveletRange (mathematics)Identification (information)WaveletOrder (biology)ElectroretinographyHumansPhotoreceptor CellsBiological systemPhotic StimulationEcology Evolution Behavior and SystematicsTheory in Biosciences
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