APPETITES AND AVERSIONS. 



in seconds. This view helps us to understand the laws of atten- 

 tion; for example, the law that attention cannot be held contin- 

 uously upon a faint, simple stimulus. For as soon as such a stim- 

 ulus is brought to maximum clearness, which constitutes the 

 consummatory situation, the appetite for it is quickly discharged 

 and its cycle comes to an end. This familiar fact shows that we, 

 like the birds, are but little able to alter the course of our behavior 

 cycles. 



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