کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2426447 1553156 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Wheel-running reinforcement in free-feeding and food-deprived rats
ترجمه فارسی عنوان
تقویت چرخیدن در موشهای آزاد و تغذیه محروم
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
چکیده انگلیسی


• Ad-lib and deprived rats trained to press lever for wheel-running reinforcement.
• Deprived rats run faster and lever press at a higher rate.
• Wheel-running and operant measures related in deprived, not ad-lib rats.
• Motivation underlying reinforcement differs in ad-lib and deprived rats.
• Sources of control over running and operant responding change.

Rats experiencing sessions of 30 min free access to wheel running were assigned to ad-lib and food-deprived groups, and given additional sessions of free wheel activity. Subsequently, both ad-lib and deprived rats lever pressed for 60 s of wheel running on fixed ratio (FR) 1, variable ratio (VR) 3, VR 5, and VR 10 schedules, and on a response-initiated variable interval (VI) 30 s schedule. Finally, the ad-lib rats were switched to food deprivation and the food-deprived rats were switched to free food, as rats continued responding on the response-initiated VI 30-s schedule. Wheel running functioned as reinforcement for both ad-lib and food-deprived rats. Food-deprived rats, however, ran faster and had higher overall lever-pressing rates than free-feeding rats. On the VR schedules, wheel-running rates positively correlated with local and overall lever pressing rates for deprived, but not ad-lib rats. On the response-initiated VI 30 s schedule, wheel-running rates and lever-pressing rates changed for ad-lib rats switched to food deprivation, but not for food-deprived rats switched to free-feeding. The overall pattern of results suggested different sources of control for wheel running: intrinsic motivation, contingencies of automatic reinforcement, and food-restricted wheel running. An implication is that generalizations about operant responding for wheel running in food-deprived rats may not extend to wheel running and operant responding of free-feeding animals.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Behavioural Processes - Volume 124, March 2016, Pages 1–9
نویسندگان
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