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| Research article summary (published 30 May 2002): |
Separation of contour and area dependent components in the first and second order kernels of the multifocal pattern appearance evoked potential.
Full Abstract
The non-linearities of the diffuse flash visual evoked potential (VEP) have been shown to generate separable waves corresponding to Magnocellular and Parvocellular contributions. The authors wished to investigate whether, under conditions of isoluminance, the chromatic pattern appearance VEP shows waveforms that are related to both the processing of contours (the pattern) and the processing of the diffuse stimulation (from the area lying between the contours). The VERIS multifocal system was used to record monocular VEP. Standard 2-ring, 3-ring, 5-ring and 7-ring VERIS pattern stimuli were employed with a cardboard circular aperture used to blank the stimulus monitor to a 9-cm diameter field. The results for four subjects were recorded. The first order kernel responses showed a significant increase in amplitude with total contour length. In comparison, the amplitudes of the first and second slices of the second order kernel did not increase with contour length. It appears that the contour-dependent component has negligible non-linear components. It is proposed that the constant, non-zero responses of the higher order kernel components reflects contributions from the diffuse chromatic VEP.
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Author information
Author/s: Crewther, David P (DP); Luu, Chi D (CD); Crewther, Sheila G (SG);
Affiliation: Brain Sciences Institute, Swinburne University of Technology, Melbourne, Victoria, Australia. dcrewther@bsi.swin.edu.au
Journal and publication information
Publication Type: Comparative Study; Journal Article
Journal: Clinical & experimental ophthalmology (Clin Experiment Ophthalmol), published in Australia. (Language: eng)
Reference: 2002-Jun; vol 30 (issue 3) : pp 231-4
Dates: Created 2002/05/15; Completed 2002/07/29; Revised 2006/11/15;
PMID: 12010221, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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