دانلود مقاله ISI انگلیسی شماره 71090
عنوان فارسی مقاله

مشکل ادراکی در رمزگذاری حافظه مبدأ و بازیابی: فعالیت الکتریکی جلوی مغز فعالیت الکتریکی مغزی جداری

کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
71090 2008 15 صفحه PDF سفارش دهید محاسبه نشده
خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.
عنوان انگلیسی
Perceptual difficulty in source memory encoding and retrieval: Prefrontal versus parietal electrical brain activity
منبع

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

Journal : Neuropsychologia, Volume 46, Issue 8, July 2008, Pages 2243–2257

کلمات کلیدی
حافظه مبدأ؛ قشر جلوی مغز؛ دشواری - حافظه کاری
پیش نمایش مقاله
پیش نمایش مقاله مشکل ادراکی در رمزگذاری حافظه مبدأ و بازیابی: فعالیت الکتریکی جلوی مغز فعالیت الکتریکی مغزی جداری

چکیده انگلیسی

It is well established that source memory retrieval – remembering relationships between a core item and some additional attribute of an event – engages prefrontal cortex (PFC) more than simple item memory. In event-related potentials (ERPs), this is manifest in a late-onset difference over PFC between studied items which mandate retrieval of a second attribute, and unstudied items which can be immediately rejected. Although some sorts of attribute conjunctions are easier to remember than others, the role of source retrieval difficulty on prefrontal activity has received little attention. We examined memory for conjunctions of object shape and color when color was an integral part of the depicted object, and when monochrome objects were surrounded by colored frames. Source accuracy was reliably worse when shape and color were spatially separated, but prefrontal activity did not vary across the object–color and frame-color conditions. The insensitivity of prefrontal ERPs to this perceptual manipulation of difficulty stands in contrast to their sensitivity to encoding task: deliberate voluntary effort to integrate objects and colors during encoding reduced prefrontal activity during retrieval, but perceptual organization of stimuli did not. The amplitudes of ERPs over parietal cortex were larger for frame-color than object–color stimuli during both study and test phases of the memory task. Individual variability in parietal ERPs was strongly correlated with memory accuracy, which we suggest reflects a contribution of visual working memory to long-term memory. We discuss multiple bottlenecks for source memory performance.

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