742 



W. LYNN BROWN AND ARNOLD A. McDOWELL 



DOSAGE GROUP 

 A -I 

 0-2 

 D-3 



Fig. 12. Mean errors for each radiation dosage group on each of the five dot- 

 discrimination problems. 



PERIPHERAL CUE TEST BOARD 



Fig. 13. The modified two-string patterned string board used for the peripheral 

 cue testing. 



