کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5925512 | 1166353 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The CS-US delay gradient in flavor preference conditioning with intragastric carbohydrate infusions The CS-US delay gradient in flavor preference conditioning with intragastric carbohydrate infusions](/preview/png/5925512.png)
Rats are able to associate a flavor with the delayed presentation of food, but the obtained flavor preferences are often weak. The present studies evaluated the effect of delay between a flavor CS and a post-oral nutrient US on the expression of conditioned flavor preferences. In Experiment 1, rats were trained with two CS flavors: one was followed after a delay by intragastric infusion of 8% glucose, and the other was followed after the same delay by intragastric water. Rats trained with 2.5, 10, and 30-min delays expressed significant (84-68%) preferences for the glucose-paired flavor whereas rats trained with 60-min delays were indifferent (51%). Experiment 2 examined flavor conditioning over a 60-min delay using 8 or 16% Polycose based on findings that orally consumed Polycose conditions preferences at this delay interval. The 8 and 16% Polycose infusions produced significant preferences which peaked at 62% and 73%, respectively. The ability to bridge these delays may allow animals to learn about slowly digested foods.
⺠Rats preferred a CS flavor paired with IG 8% glucose infused up to 30 min later. ⺠Other rats preferred a CS flavor paired with 60-min delayed 8% or 16% Polycose. ⺠The greater effectiveness of Polycose may reflect osmotic or absorptive differences. ⺠Associating oral stimuli with delayed post-oral effects may enhance diet selection.
Journal: Physiology & Behavior - Volume 105, Issue 2, 18 January 2012, Pages 168-174