STUDIES OF CEREBRAL FUNCTION. IX 



37 



groups being less than their probable errors, whereas all 

 make approximately five times as many errors as do normals. 

 The record for cases with lesions in field p is not consistent 

 with the others. The score of 92.3 errors is markedly less 

 than that of the next lowest group, but is also significantly 



TABLE 18 

 Analysis of effects of lesions largely confined to single cytoarchitectural fields 



M 



izn p 



M 



I 1 ff'n 



M 



Fig. 3 A comparison of the effects of equal amounts of destruction in differ- 

 ent cortical fields upon maze learning of maze V. The lines represent the relative 

 magnitudes of the mean scores (M) with their probable errors for normal animals 

 and for four groups of operated cases trained in maze V. N, normal; p, audi- 

 tory; w, visual; ff'n, motor; j, somesthetic. 



higher than the score of normals. The reliability of the 

 differences in both cases is low (ff'n — p = 80.8 ± 36.6; p — 

 normal = 59.2 ± 21.5). The indications from this analysis 

 of the data are that equal lesions within the motor, somesthe- 

 tic, and visual areas produce approximately equal effects upon 

 the capacity to learn the maze and that lesions within the 



