Effect of Mental Work on Values of Electric Flicker

By means of Motokawa's method of electric flicker (EF) we measured changes of electric flicker value (EFV) of 3 subjects caused by mental work (calculation of statistics) and exercise (running and steptests). 1. Immediately after mental work, the EFV increased. Recovery was very slow and much prolonged ; the difference between the EFVs measured before and 60 minutes after mental work was found statistically significant. 2. Immediately after exercise the EFV increased far more remarkably than after mental work, but recovery was very prompt; the difference of EFV from the control value was no longer significant after 20-30 min. 3. Effects of light gymnastics performed after mental work were investigated. Recovery from fatigue caused by mental work was facilitated by light gymnastics.