SENSOR Y AREAS IN THE MONKE Y AND MAN. 751 



and the Tables I., II., and III. show the results of several experi- 

 ments. 



TABLE I. 



TABLE II. 



TABLE III. 



In these Tables, F denotes excitation of frontal area ; 0, of occipital 

 lobe ; T, of first temporal gyrus. The periods of latent excitation are 

 given in seconds. The observations recorded along each horizontal line 

 are immediately consecutive. 



It will be observed that the periods of latency from the temporal 

 and occipital regions are identical (Table III.), whereas, in the course 

 of the same experiment, that from the frontal is markedly shorter 

 than from either the temporal or occipital regions. 1 In the latter case, 

 therefore, there must be at least one other nerve cell (neurone)interpolated, 

 if not more. One's first idea would be, that the action of the posterior 

 (temporal and occipital) areas is through the frontal region. But both 

 frontal regions may be completely removed, and the action will still be 



1 The variations in different experiments may be due to differences in the depth of 

 anaesthesia. 



