Abstract
It was pursued haw the decrease in the thinking power and memory reduce in smoke. The decrease in thinking power was estimated by means of the changes of correct answer rate of mental calculation. The reduction of memory was estimated how the order of four kinds of color panel could be remembered in the smoke.
Thinking power decreased with increase of smoke concentration, even in thin smoke concentration. It was clear that the apparent reduction in memory came out when the optical smoke density exceeded over 0.4/m expressed in extinction coefficient.
Changes of thinking power and reduction in memory after having alcohol were also pursued in same method as aforementioned system.
