INTEGRATION OF MOVEMENTS IN LEARNING IN THE RAT 435 



TABLE 5 Continued 



* Directive integration. 

 t Two pushes. 



t To one side of latch. 

 Missed latch. 



the neck reflex movement. In table 4, where the reflex thrusts 

 are stated as functionally developed, direct progression to the 

 latch is indicated as appearing on the second trial, and directive 

 integration is facilitated on the third trial; and in other tables, 

 where the reflex mechanisms are indicated as functionally 

 undeveloped, it is facilitated at any trial from the fourth to the 

 fourteenth. In tables 8 and 9, where marked fluctuations in 

 the extensor thrusts and in manifestations of reflex excitability 

 are stated, directive integration may be seen to disappear for 

 one or more trials then reappear. When directive integration 

 is disrupted, progression from the entrance box may be part 

 way to the door, then rapidly to one side of the problem, around 

 it, or it may be slow and wandering in any direction. In all 

 cases, with the exception of the conditions revealed in table 9 

 where it is seen that directive integration can not be facilitated, 

 towards the end of learning, the reaction time for directive 

 integration becomes more uniform, and with it that of the neck 

 reflex movement. The shortest reaction time for directive 

 integration is seen in table 6 to be tt of a second. When the 

 reaction time occurs repeatedly from i$ to II of a second, then 

 its production has become fairly constant. 



