44 'Journal of Comparative Neurology and Psychology. 



ments made in response to these distance sense cues may suffice 

 to restore the kinaesthetic-motor character of all the ensuing adjust- 

 ments. 



Likewise, when an automatic series of acts in the rat is disturbed, 

 the "movement to come" can no longer be released by impulses 

 arising from the movement just preceding. But at this point 

 the analogy between the behavior of rat and man breaks down. 

 The former apparently has no well developed distance sense cues, 

 consequently he must utilize some method other than the one 

 above described to reestablish the automatic character of his acts. 

 Our hypothesis provides the rat with such a method. According 

 to it, the rat has the possibility of receiving kinaesthetic cues which 

 function for "control" exactly as do visual cues in man. These 

 kinaesthetic cues are ordinarily not needed by the rat for controlling 

 his movements any more than visual cues are needed by man for 

 controlling his. But the moment a break occurs in the series 

 of the acts of the rat a cue is needed which will lead to the reestab- 

 lishment of the automatic character of the movement. The rat 

 receives this cue by traversing at random any "unit" of the maze. 

 The group of afferent impulses (kinaesthetic) which are aroused by 

 traversing this unit releases the proper adjustment (/. e., the old 

 movement which has been synergized on many past occasions 

 with this particular group of impulses) and the automatic char- 

 acter of the movements is again restored. 



On this supposition, man's kinaesthetic-motor habits would 

 differ from the rat's mainly in this, that whereas the former util- 

 izes distance sense cues for reestablishing automatic adjust- 

 ments, the latter utilizes kinaesthetic cues. 



