کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6005870 1184671 2014 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transcranial Direct Current Stimulation Modulates Activation and Effective Connectivity During Spatial Navigation
ترجمه فارسی عنوان
تحرک فعلی جریان مستقیم ترانزانی می کند فعال سازی و اتصال موثر در طول ناوبری فضایی
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی روانپزشکی بیولوژیکی
چکیده انگلیسی

BackgroundAllocentric navigation declines with age and neurologic disease whereas egocentric navigation does not; differences that likely arise from maladaptive changes in brain regions mediating spatial (parietal cortex; hippocampus) but not procedural processing (caudate nucleus). Transcranial direct current stimulation (tDCS) holds promise for treating such decline given its ability to modulate neuronal excitability, but its effects have yet to be examined on spatial navigation.Objectives/hypothesesUsing healthy young adults as a model, Study 1 intended to validate a novel spatial navigation paradigm using functional magnetic resonance imaging (fMRI). Using these data to determine targets for tDCS, Study 2 aimed to determine if 1) stimulation modulates activation in a polarity-specific manner; 2) stimulation results in global and/or task-specific activation changes; 3) activation changes are accompanied by changes in effective connectivity.MethodsAll participants underwent fMRI while learning allocentric and egocentric environments. Twelve participants completed Study 1. In Study 2, 16 participants were randomized to 20 min of tDCS (2 mA) using a montage with the anode over PZ and cathode over AF4 (P+F−) or the reverse montage (P−F+).ResultsStudy 1 revealed that distinct networks preferentially mediate allocentric and egocentric navigation. Study 2 revealed polarity-dependent changes in activation and connectivity. The P+F− montage increased these measures in spatial regions, especially during allocentric navigation, and the caudate nucleus. Conversely, the P−F+ montage increased activation and connectivity in lateral prefrontal cortices and posterior hippocampus.ConclusionsThese findings support the neuromodulatory effects of tDCS in non-motor areas and demonstrate proof-of-principle for ameliorating age- and disease-related decline in navigational abilities.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Brain Stimulation - Volume 7, Issue 2, March–April 2014, Pages 314-324
نویسندگان
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