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Quantitative determination of thresholds of magnetophosphenes
Author(s) -
Lövsund P.,
Öberg P. Å.,
Nilsson S. E. G.
Publication year - 1979
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs014i06sp00199
Subject(s) - phosphene , spectral composition , intensity (physics) , physics , magnetic field , optics , nuclear magnetic resonance , psychology , quantum mechanics , neuroscience , stimulation , transcranial magnetic stimulation
ELF‐ and transient magnetic fields at moderate flux densities generate visual phenomena called magnetosphosphefles. The aims of this study were 1) to determine threshold values for the appearance of magnetophosphenes as a function of magnetic‐field frequency in normal and colour‐defective volunteers; 2) to study the dependence of the threshold values on the intensity of the background light and its spectral composition; and 3) to investigate the site in the visual system where the magnetophosphenes arise. Quantitative information was obtained about the threshold values of magnetophosphenes both in normal and in colour‐defective volunteers. The phosphene threshold varied with the background light intensity and with its spectral composition.