caa a22 4500 465794629 CHVBK 20180323112034.0 cr unu---uuuuu 170327e19900801xx s 000 0 eng 10.1007/BF00142594 doi (NATIONALLICENCE)springer-10.1007/BF00142594 Variability of the steady-state visually evoked potential: Interindividual variance and intraindividual reproducibility of spatial frequency tuning [Elektronische Daten] [Werner Joost, Michael Bach] At low contrast levels there is good agreement between the psychophysical contrast sensitivity function and the tuning curve of the visually evoked potential (i.e., VEP amplitude vs spatial frequency). At high contrast, however, some researchers have found bimodal VEP tuning curves whereas others have not. We studied the VEP in 22 subjects in a short-term cross-sectional study and in 13 subjects in a longitudinal study over 8 sessions covering 28 days. Grating stimuli with 60% contrast were square-wave modulated in time (7.8 reversals/s) and space (0.06-16 cycles/degree). We found large interindividual variance in the shape of the tuning curves; about half of the subjects showed a unimodal shape, while the other half showed a bimodal one (with a ‘notch' between 1 and 2 cycles/degree). These features turned out to be stable in the longitudinal study, where variability could mainly be ascribed to a multiplicative influence common to all spatial frequencies. The marked interindividual differences in the shape of the tuning curve, which seem to be intraindividually stable, may explain previous discrepancies. It is not yet clear why the notch exists in about half of our subjects. Kluwer Academic Publishers, 1990 grating nationallicence reproducibility nationallicence spatial frequency nationallicence variability nationallicence vision nationallicence visually evoked potential nationallicence Joost Werner Universitäts-Augenklinik, D-7800, Freiburg, Germany aut Bach Michael Universitäts-Augenklinik, D-7800, Freiburg, Germany aut Documenta Ophthalmologica Kluwer Academic Publishers 75/1(1990-08-01), 59-66 0012-4486 75:1<59 1990 75 10633 https://doi.org/10.1007/BF00142594 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00142594 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Joost Werner Universitäts-Augenklinik, D-7800, Freiburg, Germany aut NATIONALLICENCE 700 1- Bach Michael Universitäts-Augenklinik, D-7800, Freiburg, Germany aut NATIONALLICENCE 773 0- Documenta Ophthalmologica Kluwer Academic Publishers 75/1(1990-08-01), 59-66 0012-4486 75:1<59 1990 75 10633 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer