DISCRIMINATIVE RESPONSES TO VISUAL STIMULI 



481 



All the prominent modes were prominent throughout the process 

 of tallying, although their relative values might shift as a result 

 of practice. 



This fact indicates that a given curve of this type is really 

 compounded from several separate distributions, more or less 

 widely separated; each of which, if isolated, might be a normal 



IS 25 30 35 



19 25 30 JS 40 41 



35 40 4S 



FIG. 3. PERCENTAGE DISTRIBUTION OF REACTION-TIMES OF SUBJECT C 



Ordinates, percentages of reactions. Abscissae, time in units of 0.01 second. 



Graph 1. Light line, 553 left hand reactions under condition Bi. 



Graph 1. Heavy line, 546 left hand reactions under condition Di. 



Graph 2. Light line, 553 left hand reactions under condition B\. 



Graph 2. Heavy line, 549 left hand reactions under condition B*. 



Graph 3. Light line, 542 right hand reactions under condition B\. 



Graph 3. Heavy line, 545 right hand reactions under condition D\. 



Graph 4. Light line, 542 right hand reactions under condition B\. 



Graph 4. Heavy line, 543 right hand reactions under condition J5 2 . 



Vertical lines indicate averages. 



PSTCHOBIOLOGT, VOL. I, NO. 6 



