کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6278536 | 1295823 | 2007 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Tracing sequential waves of rapid visuomotor activation in lateralized readiness potentials
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
LRPSOAMetacontrastPLRPMasked priming - آغازگر ماسکElectroencephalogram - الکتروانسفالوگرافیanalysis of variance - تحلیل واریانسANOVA - تحلیل واریانس Analysis of varianceMotor activation - فعال سازی موتورstimulus onset asynchrony - محرک شروع ناهماهنگیEEG - نوار مغزیLateralized readiness potential - پتانسیل آمادگی خالصResponse priming - پرایمر پاسخ
موضوعات مرتبط
علوم زیستی و بیوفناوری
علم عصب شناسی
علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Tracing sequential waves of rapid visuomotor activation in lateralized readiness potentials Tracing sequential waves of rapid visuomotor activation in lateralized readiness potentials](/preview/png/6278536.png)
چکیده انگلیسی
Feedforward activation processes are widely regarded as crucial for the automatic initiation of motor responses, whereas recurrent processes are often regarded as crucial for visual awareness. Here, we used a set of behavioral criteria to evaluate whether rapid processing in the human visuomotor system proceeds as would be expected of a feedforward system that works independent of visual awareness. We measured lateralized readiness potentials (LRPs) for key-press responses to color targets (“masks”) preceded by masked color primes mapped onto the same or opposite response, and traced the time-course of motor activation as a function of different prime and mask characteristics. LRP time-courses showed that initial motor activation occurred in prime direction and was time-locked to prime onset. Response activation was then captured on-line by the mask signal, with motor activation now time-locked to the mask and proceeding in mask direction. Crucially, the time-course of early activation by the prime was independent of all mask characteristics. This invariance in early priming effects contrasted with large differences in visual awareness for the prime produced by different masks. Results suggest that primed responses to color stimuli are controlled by feedforward waves of activation sequentially elicited by prime and mask signals traveling rapidly enough to escape the recurrent processes leading to backward masking.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Neuroscience - Volume 145, Issue 1, 2 March 2007, Pages 197-208
Journal: Neuroscience - Volume 145, Issue 1, 2 March 2007, Pages 197-208
نویسندگان
N. Vath, T. Schmidt,