PSYCHOLOGICAL MEASUREMENTS. 



621 



progress of the experiment. The time requirement gradually increased 

 from about 97 to 106 <r, a lengthening of 9.3 per cent. It is true that 

 not all of the subjects of Squad A demonstrate this same change. 

 For example, Can has values for the left movements for the different 

 dates as follows : 94, 88, 94, 87, and 87 <r. On the other hand, we may 

 point out Gar, whose values for left are 112, 114, 108, 120 and 131 <r. 

 With the majority of subjects the length of time tends to increase 

 from October 28 until January 27. The eye movements to the right 

 (see solid line for R in fig. 117) show almost no progressive change 

 during the low-diet period. This difference between the right move- 

 ments and the left movements is a surprising fact, but it absolutely 

 agrees with results previously found in this Laboratory.^ It was found 

 n the investigation with small amounts of alcohol that with the eye 

 movements the alcohol effect 

 was predominantly upon move- «<iuadA 

 ments to the left in the ratio ^i"'"*^ 

 of 10 to 4. 



Squad B (see the broken line 

 in fig. 117) demonstrates a wide 

 range of variation between their 

 three normals, November 4, 

 November 18, and December 

 16. Some uncontrolled influ- 

 ence was operating on Novem- 

 ber 18, but definite information 

 is lacking. It is very apparent 

 that it influenced the move- 

 ments to the left more strongly 

 than it did those to the right. 

 The average results for the low-diet dates January 14 and 20 show 

 slower speed than the two normal dates, November 4 and Decem- 

 ber 16. This is particularly true with the movements to the left, 

 thus agreeing with the results for Squad A. Including in the 

 average the aberrant values of November 18 with these normals for 

 November 4 and December 16, it is still true, as shown in table 

 181, that the average for the low diet shows slower speed than for 

 normal conditions. The results of the two squads therefore sub- 

 stantiate each other in the direction of the low-diet effect on this 

 neuro-muscular process of eye movements. It appears with both 

 groups of men that the muscle coordination of moving the right eye 

 from a point at the right of the field of vision to a point at the left 

 is more delicate and easily disturbed than the complementary coordina- 

 tion for movements of the same eye from a point at the left through 

 40° to the right. 



Fig. 118. — ^Variability in the speed of the eye 

 movements. 



L and R designate movements to the left and to 

 the right. Solid lines represent Squad A, 

 broken lines Squad B. 



^Dodge and Benedict, Carnegie Inst. Wash. Pub. No. 232, 1915, p. 163, table 26. 



