کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6025385 | 1580893 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Context-specific differences in fronto-parieto-occipital effective connectivity during short-term memory maintenance
ترجمه فارسی عنوان
تفاوت های متفاوتی در ارتباطات مؤثر در اتصال فوری اتصال به فوکوس در طول نگهداری حافظه کوتاه مدت
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
VSTMDLPFCITIICAMVARmultivariate autoregressiveSPLCDASTMMultivariate autoregressive modelsTMSCGC - GTCEffective connectivity - اتصال موثرElectroencephalogram - الکتروانسفالوگرافیExpectation-Maximization - انتظار-حداکثر سازیCSA - ایالات مؤتلفهٔ آمریکاERP - برنامه ریزی منابع سازمانIndependent components analysis - تجزیه و تحلیل اجزای مستقلTranscranial magnetic stimulation - تحریک مغناطیسی مغزAttention - توجهshort-term memory - حافظه کوتاه مدتVisual short-term memory - حافظه کوتاه مدت ویژوالBEM - خوبGranger causality - علیت گرنجرConditional Granger causality - علیت گرنجر مشروطintertrial interval - فاصله بین فضاییcontralateral delay activity - فعالیت تاخیری متعادلdorsolateral prefrontal cortex - قشر پیشانی غدد درون رحمیSuperior parietal lobule - لوبول ارگانیک برترEEG - نوار مغزیEvent-related potential - پتانسیل وابسته به رویداد
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب شناختی
چکیده انگلیسی
Although visual short-term memory (VSTM) performance has been hypothesized to rely on two distinct mechanisms, capacity and filtering, the two have not been dissociated using network-level causality measures. Here, we hypothesized that behavioral tasks challenging capacity or distraction filtering would both engage a common network of areas, namely dorsolateral prefrontal cortex (dlPFC), superior parietal lobule (SPL), and occipital cortex, but would do so according to dissociable patterns of effective connectivity. We tested this by estimating directed connectivity between areas using conditional Granger causality (cGC). Consistent with our prediction, the results indicated that increasing mnemonic load (capacity) increased the top-down drive from dlPFC to SPL, and cGC in the alpha (8-14Â Hz) frequency range was a predominant component of this effect. The presence of distraction during encoding (filtering), in contrast, was associated with increased top-down drive from dlPFC to occipital cortices directly and from SPL to occipital cortices directly, in both cases in the beta (15-25Â Hz) range. Thus, although a common anatomical network may serve VSTM in different contexts, it does so via specific functions that are carried out within distinct, dynamically configured frequency channels.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: NeuroImage - Volume 114, 1 July 2015, Pages 320-327
Journal: NeuroImage - Volume 114, 1 July 2015, Pages 320-327
نویسندگان
Bornali Kundu, Jui-Yang Chang, Bradley R. Postle, Barry D. Van Veen,