260 



HUMAN BEHAVIOR PROGRAM 



160 



SEALAB 



SHALLOW WATER 

 DRY LAND 



I 2 3 



TRIANGLE 



Fig. 104. Meantime (in seconds) of all sub- 

 jects and all trials for individual assembly- 

 test (triangle 1 - large bolts, same corners, 

 triangle 2 - small bolts, same corners, tri- 

 angle 3 - large bolts, different corners, tri- 

 angle 4 - small bolts, different corners) 



Table 28 



TWO-HAND COORDINATION TEST DATA FOR 



PLATE 5 UNDER THREE CONDITIONS 



(Data Given in Seconds) 



Test 

 Environment 



No. of 

 Tests 



Time to 



Accomplish 



Test 



(Mean) 



Differ- 

 ence 

 in 

 Means 



Mean 

 of the 



Differ- 

 ence 



Scores 



No. of 

 Divers 

 Perform- 

 ing Both 

 Tests 



Dry Land 

 Shallow Water 

 Sealab 



45 



14 



6 



125.1 



144.3 

 150.8 



19.2 



21.8 

 Insufficient Data 



14 



Mental Arithmetic Test — As described earlier, this task consisted of multiplying a two- 

 digit number by a one-digit number. The divers were instructed to complete as many prob- 

 lems as possible in a two-minute period. Table 29 compares the predive results with the re- 

 sults obtained in the habitat during submersion. 



Table 29 



COMPARISON OF MENTAL ARITHMETIC TEST DATA 



OBTAINED ON DRY LAND AND INSIDE SEALAB 



*N is number of tests. 



The results indicate that not only was there no decrement in performance, but rather that 

 performance actually improved in Sealab. This suggests that there was a practice effect (al- 

 though not statistically significant) between the two conditions. These data do not demonstrate 



