W. T. JAMES 



the total number of clicker signals presented is indicated. 

 This is important, since some dogs become completely inactive 

 within a relatively short time, while others remain active 

 indefinitely. Each chart indicates a course of performance 

 which may be considered the result of interaction of the 

 laboratory environment and the organism. The salivary re- 

 action is the only factor considered quantitatively. Change 



H. UI.VU1U TYPE A 



Text-figure 90 



occurs not only in this reaction but also in the total per- 

 formance. These modifications may be considered a progres- 

 sion of activity which takes place in the dog's adjustment to 

 the food taking situation. 



As indicated in the chart of animal 83 9 (text-fig. 89), in 

 the beginning the reaction is relatively intense. The situation 

 is new to the dog and the animal has not yet become ad- 

 justed to the laboratory. During this period the dog orients 

 to the food pan when the conditioned signal starts; it is 

 alert and remains in a standing position. As the chart clearly 

 shoAvs, the responses of this dog make a gradual descent, 

 decreasing in intensity, becoming irregular, and finally dis- 



