RT Journal Article
SR Electronic
T1 Interference of 50 Hz electrical cortical potentials evoked by TV systems.
JF British Journal of Ophthalmology
JO Br J Ophthalmol
FD BMJ Publishing Group Ltd.
SP 779
OP 781
DO 10.1136/bjo.63.11.779
VO 63
IS 11
A1 G H van Lith
A1 G W van Marle
A1 S Vijfvinkel-Bruinenga
YR 1979
UL http://bjo.bmj.com/content/63/11/779.abstract
AB Application of TV systems for generating patterned stimuli for the examination of the electrical cortical potentials has disadvantages caused by the frame frequency of 50 Hz of TV sets. Apart from a larger variability in latency times of the electrical potentials as compared to the results obtained by projector systems, a 50-Hz noise on the recordings mediated through the visual system may be seen. These disadvantages can be ameliorated by increasing the frame frequency of the TV set.