دانلود مقاله ISI انگلیسی شماره 76587
عنوان فارسی مقاله

استرس روانی باعث اختلالات حافظه کاری در یک پارادایم n-back

کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
76587 2008 11 صفحه PDF سفارش دهید محاسبه نشده
خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.
عنوان انگلیسی
Psychosocial stress induces working memory impairments in an n-back paradigm
منبع

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

Journal : Psychoneuroendocrinology, Volume 33, Issue 5, June 2008, Pages 643–653

کلمات کلیدی
حافظه کاری؛ پارادایم Nn-back - استرس روانی؛ قشر جلوی مغز
پیش نمایش مقاله
پیش نمایش مقاله استرس روانی باعث اختلالات حافظه کاری در یک پارادایم n-back

چکیده انگلیسی

In contrast to the substantial number of studies investigating the effects of stress on declarative memory, effects of stress on working memory have received less attention. We compared working memory (numerical n-back task with single digits) in 40 men exposed either to psychosocial stress (Trier Social Stress Test (TSST)) or a control condition. Task difficulty was varied using two conditions (2-back vs. 3-back). Salivary cortisol (as a marker of hypothalamus–pituitary–adrenal (HPA) activity) and salivary alpha-amylase (sAA as a marker of sympathetic nervous system (SNS) activity) were assessed immediately before and three times after the stress or control condition. As expected stress resulted in an increase in cortisol, sAA, and negative affect. Subjects exposed to stress showed significant working memory impairments in both workload conditions. The analysis of variance indicated a main effect of stress for reaction time as well as accuracy. In addition, for reaction time a stress×block interaction occurred. Follow up tests revealed that only during the first block at each level of difficulty performance was significantly impaired by stress. Thus, the effects of stress became smaller the longer the task was performed. Results provide further evidence for impaired working memory after acute stress and illustrate the time course of this phenomenon.

خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.