MOTOR COORDINATIONS. 



185 



others, Subjects XII and XIV, show reversed results. This difference 

 is too clear to be accidental. Together with the other peculiarities of 

 this small group, it points to a probable class difference that constitutes 

 one of the most interesting and important unsolved problems which 

 are suggested by our measurements. 



TABLE 33. Summary of the effect of alcohol on the reciprocal inrtcrvatton of the middle finger- 

 as shown by the differences. 



1 Effect on the average difference equals (av. 12, 13, 14, etc., alcohol) minus (av. 12, 13, 14, 

 etc., normal). 



2 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. 



'Dose C was given in the 12-hour experiments. 



The net result of this phase of our experimentation is that the 

 velocity of the eye-movements and the speed of reciprocal innervation 

 of the finger are both regularly decreased by alcohol. As far as these 

 processes are an indication of the adequacy of motor coordination, the 

 effect of alcohol on motor coordination is depressive. The similarity 

 of the average percentile effects of alcohol on the two processes, while 

 the processes themselves represent very different neural centers, makes 

 it probable that our experimental results indicate a widespread impair- 

 ment of motor coordination as a result of moderate doses of alcohol. 



