STUDIES OF CEREBRAL FUNCTION 



IX 



31 



h is the efficiency in learning, a a constant, and C the amount 

 of cortex intact, best expresses the form of the relation. 



With the 125 cases on maze V we have a more reliable basis 

 for analyzing this relationship. Figure 2 shows the data for 

 extent of lesions, grouped by class intervals of 5 per cent 



10 



20 



30 



40 50 60 



PER CENT LESION 



70 



Fig. 2 The relation between extent of lesion and errors made in learning in 

 maze V (8 culs de sac). The data on 60 normal and 127 operated itnimals ;ir. 

 averaged by class intervals of 5 per cent destruction. The smooth curve is the 

 best fitting one of logarithmic form. The numerals in the figure Indicate tin- 

 number of cases on which the more unreliable points are based. 



destruction and plotted against average errors tor each class. 

 The first point in the curve, zero destruction, is the average 

 of 60 normal animals. The other points are determined by 

 smaller numbers of cases. The continuous curve has been 

 derived from the data by the method of least squares and is 

 the best fitting logarithmic form. It is given l>y the n\ nation 



