کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6280172 1615085 2016 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Treatment with a muscarinic acetylcholine receptor antagonist impairs the acquisition of conditioned reward learning in rats
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
Treatment with a muscarinic acetylcholine receptor antagonist impairs the acquisition of conditioned reward learning in rats
چکیده انگلیسی
The neural mechanisms whereby a reward-associated stimulus gains reinforcing properties and comes to function as a conditioned reward (CR) are not understood. We propose that muscarinic acetylcholine (mACh) receptor stimulation is necessary for this type of learning. Here we tested the hypothesis that mACh receptor antagonism, with scopolamine, would attenuate the acquisition by a food-related stimulus of the capacity to function as a CR. Rats were exposed to 5 pre-exposure sessions during which two levers were present, one producing a light and the other a tone when pressed. This was followed by 3 conditioning sessions in which the levers were absent and the rats were presented with 30 light-food pairings delivered randomly. In the test session, the levers were present and presses on both levers were recorded. Different groups of rats received intraperitoneal injections of scopolamine (0, 0.375, 0.75 and 1 mg/kg) either prior to each conditioning session or prior to the test session. All groups showed significantly greater responding on the light lever in the test compared to the pre-exposure sessions, demonstrating the CR effect. In animals treated prior to conditioning the scopolamine groups pressed significantly less on the light lever than the vehicle group. In animals treated prior to the test the increased lever pressing for light was similar for all groups. These data suggest that scopolamine impaired the acquisition of CR but not its expression. The results support the hypothesis that mACh receptor stimulation is important for the acquisition by reward-associated stimuli of the ability to function as CRs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience Letters - Volume 614, 12 February 2016, Pages 95-98
نویسندگان
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