The Effect of Pulsating Light Sources on the Electrical Activity of the Human Brain

摘要

Assimilation by the brain of high frequencies of light pulsations is observed even during pulsations having a depth that would occur under normal conditions of lighting by luminiscent lamps and when no measures are undertaken to lower the depths of oscillations of the light flow. It is assumed that a prolonged reproduction by the brain of high frequencies of pulsating light, as well as of two or three rhythms of light flashes differing in frequency, may cause fatigue of the brain's nervous system induced by prolonged functioning in a relatively unnatural rhythm of nervous activity. The following conclusions are drawn: (1) When luminescent lamps with a frequency of 100 cps are switched on, it is desirable to use an arrangement in which the depths of pulsations not to exceed 5 - 8%, may be assured. (2) During pulsation frequencies of 300 cps and higher in the light flow, the depth of pulsations is of no consequence since the human brain is not responsive to such a frequency. (3) Experiments on the changes in the durations of light flashes illustrate the expediency of using long-lag luminophors, in luminescent lamps.