Visual evoked potentials elicited by a moving unidimensional noise pattern |
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| Institution: | 1. Dienst Oogheelkunde, Universitaire Ziekenhuizen Leuven, Kapucijnenvoer 33, B-3000 Leuven, Belgium;2. Laboratorium voor Neuro- en Psychofysiologie, KU Leuven, Leuven, Belgium;1. School of Materials Science and Engineering, Xi''an University of Technology, Shaanxi, Xi''an, 710048, PR China;2. Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK;1. Specialized Master Program in Mental Health Nursing, Faculty of Nursing, University of Indonesia, Depok, Indonesia;2. Bhakti Husada Nursing Academy, Bekasi, Indonesia;3. Department of Mental Health Nursing, Faculty of Nursing, University of Indonesia, Depok, Indonesia;1. Department of Engineering and Design, University of Sussex, Brighton BN1 9QJ, UK;2. Sackler Centre for Consciousness Science, University of Sussex, Brighton BN1 9QJ, UK;3. Department of Informatics, University of Sussex, Brighton BN1 9QJ, UK;4. School of Psychology, University of Sussex, Brighton BN1 9QH, UK;1. Department of Electrical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India;2. Advanced Technology Development Center, Indian Institute of Technology Kharagpur, Kharagpur, India;1. Occupational Diseases Department, CHU de Rennes, Université de Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, 35000 Rennes, France;2. CHU de Rennes, 35000 Rennes, France;3. Public Health Department, CHU de Rennes, Université de Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, 35000 Rennes, France;4. Infectious diseases and intensive care unit, CHU de Rennes, Université de Rennes, Inserm U1230, IFR140, 35033 Rennes, France |
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| Abstract: | (1) Motion onset and offset visual evoked potentials (VEPs) were recorded in normal human subjects using a unidimensional noise pattern moving at 1, 8 and 64°/s. The maximum N1-P1 amplitude of the motion onset response was obtained when using a fine noise pattern (maximum energy at 5.2 cpd) moving at 8°/s. (2) At a velocity of 8°/s, the motion onset response (fine pattern, 0.70 contrast) showed a morphology similar to the pattern disappearance response. Both at a lower (1°/s) and a higher velocity (64°/s) the N1-P1 amplitude of the motion onset complex was significantly reduced. The latency of the motion onset response (8°/s) and the pattern disappearance complex were significantly different. (3) The effect of lowering the spatial content of the noise pattern on the amplitude of the motion onset response was different for the 3 velocities tested: the largest effect was at the lower velocity of 1°/s; there was no similar effect on the pattern disappearance response. (4) With decreasing contrast, the N1-P1 amplitude of the motion onset response at 8°/s decreased, but this reduction in amplitude was much less than that of the disappearance response. The contrast dependency of the motion onset complex was identical for binocular and monocular recordings. (5) Increasing the motion duration or the duration of the interstimulus interval did not alter the general morphology of the motion response. |
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