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DISCUSSION OF CHAPTER X 



Harold W. Shipton (Iowa City, Iowa): In the averaged 

 record that you showed, were the stimuli being delivered ran- 

 domly, or were they as regular as you could make diem? Would 

 you care to comment on whether the time characteristics of the 

 external drive signal appear to you to be important in the con- 

 struction of the model? 



