COMPARATIVE STUDIES ON THE SENSE OF TASTE 



291 



Prior exposure to sugars, particularly the high concentrations, had a 

 pronounced effect on both preference and fluid intake. Figure 6 illustrates 

 this divergence between ascending and descending sequences with xylose, 

 and Fig. 7 presents similar data for lactose. The difference in response in 

 the case of these two sugars is worthy of special note. The other sugars, 

 i.e., glucose and maltose, have yet different shaped curves (Fig 8). A 



PREFERENCE FOR LACTOSE / WATER 



4 1.6 2.4 32 40 5l2 70 



CONCENTRATION CMS/ 100 ML. 



0.4 1.2 ZO 3.2 44 60 



CONCENTRATION CMS / 100 M L 



Fig. 7. The effect of prior ascending or descending concentration sequences on 

 subsequent preferences on the left and on fluid intake on the right (lactose). 



PREFERENCE FOR MALTOSE/WATER 

 AND TOTAL FLUID INTAKE (RATS) 



1.5 4.5 75 12 18 24 



CONCENTRATION GMS./lOOML. 



1.5 4.5 7.5 12 18 24 



CONCENTRATION GMS./IOO ML. 



Fig. 8. The effect of prior ascending or descending concentration sequences 

 on subsequent preferences on the left and on fluid intake on the right (maltose). 



conservative observation would be that both the specific character of the 

 sugar and the concentration sequence will influence the preference behavior 



