Title :
Lissajous figures and visual electrograms by colored modulated stimulation
Author :
Albuisson, Eliane ; Alfieri, Rinaldo ; Boire, Jean-Yves
Author_Institution :
Dept. of Biomath., Univ. of Clermont-Ferrand, France
Abstract :
The phase differences between visual evoked responses and electroretinograms were studied. Colored sinusoidal stimulation was obtained using a Vo van Toi and Grounauer papillometer (modulation: 100%; flicker frequency: 5 Hz and 20 Hz; fields size: 6° and 60°; color: white, red, green and blue). Recordings were made using cutaneous electrodes and averaging (analysis time: 0.6 s; number of sweeps: 100). Fourier series analysis showed the red to be slower than the blue using stimulation at 5-Hz and 60°. This result was reversed for both the 20-Hz, 60° and 5-Hz, 6° cases, where the central retina is at less of a disadvantage
Keywords :
bioelectric potentials; colour vision; 20 Hz; 5 Hz; Fourier series analysis; Grounauer papillometer; Lissajous figures; analysis time; averaging; blue; central retina; colored modulated stimulation; colored sinusoidal stimulation; cutaneous electrodes; electroretinograms; flicker frequency; green; phase differences; red; visual electrograms; visual evoked responses; white; Electrodes; Filtering; Fourier series; Frequency; Harmonic analysis; Low pass filters; Optical modulation; Power harmonic filters; Retina; Sampling methods;
Conference_Titel :
Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in
Conference_Location :
Seattle, WA
DOI :
10.1109/IEMBS.1989.95610
