کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5631674 1406503 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Attention reorganizes connectivity across networks in a frequency specific manner
ترجمه فارسی عنوان
توجه به ارتباط مجدد در شبکه ها را به شیوه خاصی تنظیم می کند
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب شناختی
چکیده انگلیسی


- Attention paradigm with ultra-long trials of 2 min and matched vision control.
- Ultra-long trials increased connectivity two-fold compared to 20 s trials.
- Attention, compared to matched visual stimulation, de-correlated visual cortex.
- Visual de-correlation mediated by high frequencies, other connections by all bands.
- Results suggest reorganization of connections by attention is frequency specific.

Attention allows our brain to focus its limited resources on a given task. It does so by selective modulation of neural activity and of functional connectivity (FC) across brain-wide networks. While there is extensive literature on activity changes, surprisingly few studies examined brain-wide FC modulations that can be cleanly attributed to attention compared to matched visual processing. In contrast to prior approaches, we used an ultra-long trial design that avoided transients from trial onsets, included slow fluctuations (<0.1 Hz) that carry important information on FC, and allowed for frequency-segregated analyses. We found that FC derived from long blocks had a nearly two-fold higher gain compared to FC derived from traditional (short) block designs. Second, attention enhanced intrinsic (negative or positive) correlations across networks, such as between the default-mode network (DMN), the dorsal attention network (DAN), and the visual system (VIS). In contrast attention de-correlated the intrinsically correlated visual regions. Third, the de-correlation within VIS was driven primarily by high frequencies, whereas the increase in DAN-VIS predominantly by low frequencies. These results pinpoint two fundamentally distinct effects of attention on connectivity. Information flow increases between distinct large-scale networks, and de-correlation within sensory cortex indicates decreased redundancy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: NeuroImage - Volume 144, Part A, 1 January 2017, Pages 217-226
نویسندگان
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