In tie latest years, the selection of inductees in Korea has turned more refined for national defense in terms of elitism, and along with a rapid industrialization, the demand for skilled technicians and engineers handling precision equipment， chemicals, explosives, and power-operated tools, machines and vehicles is increasing more than ever. It may be said that in pre-employment exam ination of the workers engaged in these precision and hazardous jobs, more emphasis should be given to psychiatric and neurological evaluation than to general and patternized physical checkup in certain aspects. In other words, it would be ideal if we could screen out accident prone factors and risk factors related to neuropsychiatric disorders prior to military conscription or employment. Studies of this type, however, would incur a burden of huge expenses on the part of employers. The author has selected a certain number of youths and adults with normal findings of routine waking E.E.G. out of those who have had experiences of unconscious an d /o i convulsive spells, and thereby supplemented his previous preliminaty study entitled “I.M. Pentylenetetrazol Provocation E.E.G.,” 1977. In this study the author has been able to determ ine almost definitely the required amount of I.M. injection for the test, and carefully measured the “latency” up to the moment when paroxysms or positive responses are disclosed after an injection. The hours from an injection foreevery study until it is completed are really a breathless and extremely tense moment for the three physicians and technologists attending the test because of a possible drug induced “status”. The author has tried to figure out this latency in this study. The latency is meaningful in that it is the very “time lag” or “Induction Latency，’spent for the pentylenetetrazol injection, an “ignition” to produce the burst of a big squib, namely a positive reponse on E.E.G. By knowing this lag, we would be able to use this procedure more easily and popularly.
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