COLOR BLINDNESS OF CATS 



125 



TABLE I (B) 

 Typical Discrimination by Series with Approach to a Confusion Area 



Cat 4* 

 Stimulus Color — Yellow 

 Yellow with Errors Correct Choices No. of Trials 



30 

 30 

 24 

 25 

 46 

 29 

 26 

 82 

 393 

 393 



30 



30 



30 



30 



60 



30 



30 



120 



600 



600 



TABLE II 

 A Typical Case of "Difficult Discrimination" 



Cat No. 3 

 Stimulus Color, Blue. Confusion Color, VBT1 



Series 



Errors 



Correct Choices 

 19 

 20 

 16 

 16 

 21 

 15 

 17 

 22 

 20 

 25 

 19 

 22 

 16 

 21 

 20 

 18 

 22 

 25 

 18 

 25 

 23 

 18 

 16 

 27 

 26 

 25 



532 



Per Cent of Error 



46f 



46f 



30 



50 



43| 



26f 



33| 



16f 



33! 



46| 



30 



33| 



40 



26| 



16f 



40 



16f 



23| 



40 



46f 



10 



13! 



161 



Average 3li z % 



*This cat had discriminated the yellow from the Bradley colored papers, begin- 

 ning with the Red Violets through to the place where this table begins, i.e., he had 

 discriminated it from forty Bradley colors. 



