Some failures of intragastric XXXX infusions to support flavor preference learning.

@entity35 @entity1219 @entity1483 @entity1372
@entity35 can acquire conditioned flavor preferences based on the postingestive delivery of energy-rich nutrients. Here, we tried to condition flavor preferences to the postingestive delivery of the nutrient, @entity1372 . Three experiments were conducted. In one, @entity1372 -depleted @entity35 were allowed to choose between two arbitrary flavors for 8 days. Ingestion of one of the flavors initiated infusions of one of two volumes of 150 mM @entity1219 , whereas ingestion of the other flavor had no effect. The @entity35 showed no preference for the flavor paired with @entity1219 infusion. In another, @entity1372 -depleted @entity35 were given two pairs of 24-h one-bottle training trials. Ingestion of the flavor presented during one trial initiated infusions of water or one of four concentrations of @entity1219 (75, 150, 300 or 450 mM @entity1219 ). Ingestion of the flavor presented on the other trial in each pair had no effect. In a subsequent two-bottle choice between the two flavors, the @entity35 were either indifferent to (water, 75 and 150 mM) or avoided (300 or 450 mM) the infusion-paired flavor. In the third study, replete @entity35 were trained as in the previous experiment with 150 mM @entity1219 as the infusate and tested after @entity1372 deficiency was induced by @entity1483 . These animals avoided the flavor paired with @entity1219 infusion. We conclude that @entity35 cannot associate an arbitrary taste with the beneficial effects of postingestive delivery of @entity1219 , or if they can, this occurs only under rare circumstances.
