Effect of spatial frequency on simultaneous recorded steady-state pattern electroretinograms and visual evoked potentials |
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| Affiliation: | 1. Drayer Department of Electrical Engineering, Lamar University, Beaumont, USA;2. Department of Biology, Lamar University, Beaumont, USA;3. Department of Electrical and Computer Engineering, University of Houston, Houston, USA;1. Section of Orthopaedics, Department of Surgical Sciences, Uppsala University, Uppsala, Sweden;2. Section of Vascular Surgery, Department of Surgical Sciences, Uppsala University, Uppsala, Sweden;3. Health Services Research, Department of Public Health and Caring Sciences, Uppsala University, Uppsala, Sweden;4. Department of Surgical Sciences, Uppsala University, Uppsala, Sweden;1. School of Aeronautics, Northwestern Polytechnical University, Xi''an, Shaanxi, China;2. Shaanxi Key Laboratory of Impact Dynamic and Its Engineering Application, Xi''an, Shaanxi, China;3. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an, Shaanxi, China;4. Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Osaka, Japan;5. School of Civil Aviation, Northwestern Polytechnical University, Xi''an, Shaanxi, China;6. Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications, Xi''an, Shaanxi, China;1. Centre for Advanced Materials and Technologies, Warsaw University of Technology, Warsaw, Poland;2. Applied Biotechnology, Faculty of Chemistry, Warsaw University of Technology, Warsaw, Poland;3. Department of Pharmaceutical Analysis and Medicinal Chemistry, Faculty of Pharmacy, Universitas Padjadjaran, Indonesia;4. Veritas In Silico, 1-11-1 Nishigotanda, Shinagawa-ku, Tokyo 141-0031, Japan;5. Faculty of Mathematics and Information Science, Warsaw University of Technology, Warsaw, Poland;6. Laboratory of Functional and Structural Genomics, Centre of New Technologies, University of Warsaw, Warsaw, Poland;1. ToNIC, Toulouse NeuroImaging Center, Université de Toulouse, Inserm, UPS, France;2. Ipsen Innovation, Les Ulis, France;3. Department of Neurological Rehabilitation, University Hospital of Toulouse, Hôpital de Rangueil, Toulouse, France;4. Department of Functional Physiological Explorations, University Hospital of Toulouse, Hôpital de Rangueil, Toulouse, France |
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| Abstract: | Pattern electroretinograms (P-ERGs) and visual evoked potentials (VEPs) to 4 Hz alternating square-wave gratings were simultaneously recorded in 23 subjects. Responses were Fourier analyzed and amplitude and phase of the 2nd and 4th temporal harmonics were measured.The spatial frequency-amplitude function of the P-ERG 2nd harmonic component displayed either a bandpass tuning behavior, or a low-pass behavior. The peak amplitude for subjects with bandpass tuning was at 1.5 c/deg. The phase of the P-ERG 2nd harmonic decreased monotonically as spatial frequency increased. The VEP 2nd harmonic had a bimodal spatial frequency function with a peak at 3 c/deg and a second increase at spatial frequencies below 1 c/deg, regardless of the P-ERG characteristics. The phase of VEP 2nd and 4th harmonic had an inverted U-shaped function with peak at 3 c/deg and 1.5 c/deg respectively.Comparison of simultaneously recorded P-ERG and VEP spatial frequency functions demonstrated different tuning behavior for cortical and retinal responses. It is concluded that the proposed technique permits the separate analysis of retinal and cortical processing of visual information. The 2nd and 4th harmonic components of VEP behave independently of each other suggesting they may be generated by different subsystems. |
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