磁気閃光現象の知覚視野範囲と知覚周波数

抄録

In this paper, the sphere of magnetophosphene in the visual field and the flickering frequency of the magnetophosphene are investigated. Magnetophosphene, a flickering light sensation perceived when a human head or visual system is exposed to an ELF magnetic field with sufficient intensity, is considered to be a sensation caused by activity of the stimulated retina. As the intensity of the magnetic field is increased, the sphere of the magnetophosphene spreads gradually over the visual field. The flickering frequency goes up and down when the frequency of the magnetic field is increased and decreased. We discuss these results with respect to not only the estimated current density induced in the retina by a magnetic field but also the threshold of the current density that is required to cause retinal cell activity in a magnetically stimulated human eye. The magnetophosphene is considered to be perceived in the local visual field corresponding to the retinal sphere of activity.