PSYCHOPHYSICAL DISCRIMINATION 



73 



WEIGHT DIFFERENCE AW IN GRAMS 



Figure 10. — Comparison of theory with experiment: discrimination of lifted 

 weights for three observers Qi,%, and 3 , left hand L, right hand R, and aver- 

 age for both hands M. Curve, theoretical, based on equations (25) -(28) ; points 

 experimental (Holway, Smith, and Zigler, 1937). Abscissa, lesser weight in 

 grams, ordinate, just-discriminable difference in grams. 



