کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6027524 | 1580912 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dopaminergic stimulation facilitates working memory and differentially affects prefrontal low theta oscillations
ترجمه فارسی عنوان
تحریک دوپامینرژیک حافظه کاری را تسهیل می کند و به طور متفاوتی بر نوسانات تتا کم پیش فرنتن تاثیر می گذارد
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کلمات کلیدی
دوپامین، الکتروانسفالوگرافی، نوسانات تتا، حافظه کاری،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب شناختی
چکیده انگلیسی
We used electroencephalography (EEG) together with psychopharmacological stimulation to investigate the role of dopamine in neural oscillations during working memory (WM). Following a within-subjects design, healthy humans either received the dopamine precursor l-Dopa (150Â mg) or a placebo before they performed a Sternberg WM paradigm. Here, sequences of sample images had to be memorized for a delay of 5Â s in three different load conditions (two, four or six items). On the next day, long-term memory (LTM) for the images was tested. Behaviorally, l-Dopa improved WM and LTM performance as a function of WM load. More precisely, there was a specific drug effect in the four-load condition with faster reaction times to the probe in the WM task and higher corrected hit-rates in the LTM task. During the maintenance period, there was a linear and quadratic effect of WM load on power in the high theta (5-8Â Hz) and alpha (9-14Â Hz) frequency range at frontal sensors. Importantly, a drug by load interaction - mimicking the behavioral results - was found only in low theta power (2-4Â Hz). As such, our results indicate a specific link between prefrontal low theta oscillations, dopaminergic neuromodulation during WM and subsequent LTM performance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: NeuroImage - Volume 94, 1 July 2014, Pages 185-192
Journal: NeuroImage - Volume 94, 1 July 2014, Pages 185-192
نویسندگان
Cindy Eckart, LluÃs Fuentemilla, Eva M. Bauch, Nico Bunzeck,