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The correlation dimension: a useful objective measure of the transient visual evoked potential?
- Source :
- Journal of vision. 8(1)
- Publication Year :
- 2006
-
Abstract
- Visual evoked potentials (VEPs) may be analyzed by examination of the morphology of their components, such as negative (N) and positive (P) peaks. However, methods that rely on component identification may be unreliable when dealing with responses of complex and variable morphology; therefore, objective methods are also useful. One potentially useful measure of the VEP is the correlation dimension. Its relevance to the visual system was investigated by examining its behavior when applied to the transient VEP in response to a range of chromatic contrasts (42%, two times psychophysical threshold, at psychophysical threshold) and to the visually unevoked response (zero contrast). Tests of nonlinearity (e.g., surrogate testing) were conducted. The correlation dimension was found to be negatively correlated with a stimulus property (chromatic contrast) and a known linear measure (the Fourier-derived VEP amplitude). It was also found to be related to visibility and perception of the stimulus such that the dimension reached a maximum for most of the participants at psychophysical threshold. The latter suggests that the correlation dimension may be useful as a diagnostic parameter to estimate psychophysical threshold and may find application in the objective screening and monitoring of congenital and acquired color vision deficiencies, with or without associated disease processes.
- Subjects :
- Adult
Male
medicine.medical_specialty
Correlation dimension
genetic structures
media_common.quotation_subject
Audiology
Stimulus (physiology)
Contrast Sensitivity
Optics
Fractal
Perception
medicine
Psychophysics
Humans
Chromatic scale
Evoked potential
Mathematics
media_common
Fourier Analysis
business.industry
Contrast (statistics)
Sensory Systems
Ophthalmology
Amplitude
Sensory Thresholds
Space Perception
Evoked Potentials, Visual
Female
business
Color Perception
Photic Stimulation
Subjects
Details
- ISSN :
- 15347362
- Volume :
- 8
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Journal of vision
- Accession number :
- edsair.doi.dedup.....d090d08abb5b44ec0ae97af81fc6c140