دانلود مقاله ISI انگلیسی شماره 69543
عنوان فارسی مقاله

استرس مزمن باعث اختلال در فراخوان انقراض ترس شرطی می شود

کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
69543 2006 6 صفحه PDF سفارش دهید محاسبه نشده
خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.
عنوان انگلیسی
Chronic stress impairs recall of extinction of conditioned fear
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Neurobiology of Learning and Memory, Volume 85, Issue 3, May 2006, Pages 213–218

کلمات کلیدی
قشر بجلو مغز میانی؛ تهویه ترس؛ انقراض؛ موش
پیش نمایش مقاله
پیش نمایش مقاله استرس مزمن باعث اختلال در فراخوان انقراض ترس شرطی می شود

چکیده انگلیسی

Chronic restraint stress produces retraction of apical dendrites of pyramidal neurons in medial prefrontal cortex. To begin to examine the functional significance of this dendritic reorganization, we assessed the effects of chronic restraint stress on a prefrontally mediated behavior, extinction of conditioned fear. After bar press training to obtain a baseline of activity against which to measure freezing, rats were either unstressed or stressed via placement in a plastic restrainer (3 h/day for 1 week). After an additional day of bar press training, rats underwent fear conditioning and extinction. Rats received five habituation trials to a 30-s tone (4.5 kHz, 80 db) followed by seven pairings of tone and footshock (500 ms, 0.5 mA). One hour later, rats received tone-alone extinction trials to criterion. The next day, rats received 15 additional extinction trials. Percent freezing was assessed during all phases of training. Stress did not significantly affect unconditioned responding to tone, acquisition of conditioned fear, or initial extinction, but significantly increased freezing on extinction day 2. Thus, consistent with the regressive dendritic changes seen in medial prefrontal cortex, one week of restraint stress specifically impaired recall of extinction, a pattern of deficits typical of animals with impaired medial prefrontal function.

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