کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7298694 | 1475119 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Learning what to expect and when to expect it involves dissociable neural systems
ترجمه فارسی عنوان
یادگیری چیزی که انتظار می رود و زمانی که انتظار می رود شامل سیستم های عصبی تشخیصی باشد
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کلمات کلیدی
پردازش پاداش، آمیگدالا، زمان بندی فاصله، کاهش ارزش پاداش، روش پیک،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب رفتاری
چکیده انگلیسی
Two experiments with Long-Evans rats examined the potential independence of learning about different features of food reward, namely, “what” reward is to be expected and “when” it will occur. This was examined by investigating the effects of selective reward devaluation upon responding in an instrumental peak timing task in Experiment 1 and by exploring the effects of pre-training lesions targeting the basolateral amygdala (BLA) upon the selective reward devaluation effect and interval timing in a Pavlovian peak timing task in Experiment 2. In both tasks, two stimuli, each 60â¯s long, signaled that qualitatively distinct rewards (different flavored food pellets) could occur after 20â¯s. Responding on non-rewarded probe trials displayed the characteristic peak timing function with mean responding gradually increasing and peaking at approximately 20â¯s before more gradually declining thereafter. One of the rewards was then independently paired repeatedly with LiCl injections in order to devalue it whereas the other reward was unpaired with these injections. In a final set of test sessions in which both stimuli were presented without rewards, it was observed that responding was selectively reduced in the presence of the stimulus signaling the devalued reward compared to the stimulus signaling the still valued reward. Moreover, the timing function was mostly unaltered by this devaluation manipulation. Experiment 2 showed that pre-training BLA lesions abolished this selective reward devaluation effect, but it had no impact on peak timing functions shown by the two stimuli. It appears from these data that learning about “what” and “when” features of reward may entail separate underlying neural systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neurobiology of Learning and Memory - Volume 153, Part B, September 2018, Pages 144-152
Journal: Neurobiology of Learning and Memory - Volume 153, Part B, September 2018, Pages 144-152
نویسندگان
Andrew R. Delamater, Brandon Chen, Helen Nasser, Karim Elayouby,