ACTION OF OPIUM ON PSYCHOLOGICAL REACTION TIME 25 



effect of 4 mgm. of morphin on one of the subjects is tabulated. 

 In the first series of readings the normal reaction times are re- 

 corded, the first line indicating the average of a large number 

 of readings; the second line the mean variation, and the third 

 line the relative variation. The normal having been established, 

 the drug was injected and four series of readings were made in the 

 same order as above, as indicated in the table. In table 4 the 

 effect of the same dose of morphin, 4 mgm., in the form of narco- 

 phin, i.e., in combination with 8 mgm. of the inert alkaloid nar- 

 cotin, in the same subject is given. Here the number of errors 

 are also given. 



TABLE 4 



Dr. Macht, July 20, 1916; Narcophin 12 mgm. (= Morphin meconate 4 mgm.) at 



3.15 p.m. 



NORMAL DATA 



As might have been expected, the normal reaction time varied 

 widely in the different subjects. 



The normal reaction time for simple sound ranged from 0.172 

 to 0.340 of a seco'nd, the commonest figure lying between 0.250 

 and 0.300 of a second. 



The simple reaction time for touch ranged from 0.120 to 0.280 

 of a second, the most frequent reading lying between 0.140 and 

 0.190 of a second. 



