COMPLEX NEURAL ARCS. 



107 



The average of mean normal variation for the main group is 7.7 per 

 cent of the average latency. It is notable that nowhere, not even in 

 the psychopathic cases, does the mean variation reach 10 per cent of 

 the average. This is the more conspicuous when one realizes that 

 only one of the subjects (Subject VI) had ever served as a subject in 

 similar experiments, and, moreover, that the mean variation includes the 

 variations which must be expected from the differences in familiarity 

 among the 24 stimulus words, as well as the psychophysical variability 

 of the subjects. 



TABLE 12. Nummary of the effect of alcohol on the word-reactions a,s expressed in averages 



and differences. 



[Average values given in thousandths of a second.] 



'Effect on averages equals alcohol average minus normal average. 



"Effect on the average difference equals (av. 1-2, 1-3, 1-4, etc., alcohol) minus (av. 1-2, 1-3, 

 1-4, etc., normal). 



3 Effect on the percentile difference equals the effect of alcohol on the average difference divided 

 by the average of the corresponding normals of the day. 



4 Dose C given in 12-hour experiments. 



The effect of repetition decreases the reaction latency between the 

 first and last normal day 3.7 per cent for the normal group. The effect 

 of repetition for the psychopathic group is less than 1 per cent. 



With respect to instrumental accuracy, community of pre-experi- 

 mental experiences, low variability, and small effect of repetition the 

 word-reaction measurements qualify as among the most satisfactory 

 of the group. 



