LABORATORY TESTS 127 



that I worked under some difficulty, since I had to care 

 for the apparatus. 



Let us now turn to a discussion of the several figures. 



Figure 6 (von Allesch) gives a typical view of the 

 great, and at the same time economic concentration of 

 attention characteristic of the subject. Respiration (first 

 curve) is not so profound as usual, yet is changed very 

 little. The head-jerk (fourth curve) is of medium height. 

 It occurs just at the proper moment, — the subject had 

 thought of 2, and had directed his attention economic- 

 ally. This attention was of the kind described as type I. 

 on page 93. The lowering of the head, (recorded in the 

 figure by a rise in the curve), immediately following upon 

 the head-jerk upward, is irrelevant. 



In figure 7 (Chaym) we have a record of a different 

 nature. Respiration was inhibited throughout the test, — 

 (the small waves are due to the pulsating of the heart) ; 

 immediately after the test deep breathing takes place. 

 Tension steadily increased till 3, the number expected, 

 was reached. The head, accordingly, gradually sank a 

 little forward. The head-jerk ensued during an interval 

 beginning just before the reaching of the goal and ended 

 immediately after. The movement was predominantly 

 backward, its upward direction being only through a 

 distance of J4 millimeter. (This subject was not so 

 strongly motor as the preceding one.) The reaction 

 followed promptly as seen in curve 6. It was the decided 

 raising of the head which follows the head-jerk, that 

 prevented the usual back-step with the left foot, when 

 the subject was working with Hans. 



Figure 8 (von Manteuffel) is typical of strong and 

 at the same time economical concentration. Respiration, 

 normally deep and very regular, is for a time completely 



