78 Comparisons between Reflex Inhibition and Reflex Excitation 



the second stimulus overlaps in time with that occasioned by the first 

 stimulus. In such summations as that, for instance, of fig. 10, it seems 

 probable that the greater reflex effect of the more rapidly following stimuli 



II 



i| 



Fig, 10. 



is due to summation and overlapping in time of the periods of inhibitions 

 occasioned centrally by the individual stimuli. 



It is evident that the reflex arc is delicately responsive to the time 

 relations of its external stimuli in the inhibitory aspect of its function, 

 as well as in the excitatory. 



