The effect of eccentricity and colour on negativity in pattern onset visual evoked potentials |
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| Affiliation: | 1. Institute of Mechanical and Manufacturing Engineering, School of Engineering, Cardiff University, Cardiff CF24 3AA, UK;2. Cardiff Business School, Cardiff University, Cardiff CF10 3EU, UK;3. School of Computing, Mathematics and Digital Technology, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK;4. Department of Information Management, School of Government, Beijing Normal University, Beijing 100875, China;5. School of Management, Chongqing Technology and Business University, Chongqing 400067, China;1. Department of Sport and Health Sciences, Technical University of Munich, Munich, Germany;2. Department of Movement Sciences, Catholic University of Leuven, Leuven, Belgium;3. School of Psychology, The University of Queensland, Brisbane, Australia;1. Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, USA;2. Department of Electrical Engineering and Computer Science, University of Maryland Baltimore County, Baltimore, MD, USA;1. Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Slovenia;2. Formerly USDA-ARS-Center for Grain and Animal Health Research, 1515 College Avenue, Manhattan, KS, 66502, USA;3. Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Phytokou str., 38446, N. Ionia, Magnesia, Greece;1. Freie Universität Berlin, Brain Language Laboratory, Department of Philosophy and Humanities, 14195, Berlin, Germany;2. Charité Universitätsmedizin Berlin, Department of Psychiatry, 12203, Berlin, Germany;3. Berlin School of Mind and Brain, Humboldt Universität zu Berlin, 10099 Berlin, Germany;4. Einstein Center for Neurosciences, 10117, Berlin, Germany |
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| Abstract: | The effects of stimulus size, eccentricity and colour on the amplitudes of N100 and N130 were investigated in pattern onset VEPs.For black-and-white pattern stimulation, the first set of stimuli was derived from a full dartboard pattern. Central stimulation of various extents was produced by patterns with reduced number of outer rings and for eccentric stimuli a number of central rings were removed from the full pattern. It was found that amplitude of N100 was maximal in VEPs to central stimuli and that it was greatly reduced when eccentric stimulation was applied. The amplitude of N130 showed no significant change in relation to the type of stimulus.When checkerboard stimuli of identical configuration were used for black-and-white pattern stimulation instead of dartboards, systematic changes in peak latencies of N100 were observed in relation to check size. In VEPs to centrally presented small checks the emergence of an early negative peak preceding N100 was recorded at 75 msec. In VEPs to coarse checkerboards presented centrally N100 was often observed with a delayed peak latency of 110 msec. Changes in N130 were not regular when checkerboards with different check sizes were presented centrally. For eccentric checkerboard stimulation, both negative peaks N100 and N130 were revealed. Their peak latencies were similar to those observed in the case of dartboard paracentral stimulation.In VEPs to patterns projected through red or blue filters, regular changes were observed in both negative peaks. Introduction of the red filter led to enhancement of the N100 amplitude in VEPs to dartboard and to checkerboards with fine checks, but it caused no effect on N100 in the VEPs to coarse checkerboards. Introduction of the blue filter led to a decrease in the N100 amplitude in VEPs to dartboard and fine checkerboards and to a slight increase of N100 VEPs to coarse checkerboards. Changes in N130 were observed only when the blue filter was introduced and they corresponded to those which take place when the level of illumination changes from photopic to mesopic. |
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